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42 vulnerabilities by dena
CVE-2024-45403 (GCVE-0-2024-45403)
Vulnerability from nvd – Published: 2024-10-11 14:28 – Updated: 2024-10-11 14:40
VLAI
EPSS
VEX
Title
H2O assertion failure when HTTP/3 requests are cancelled
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:40 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/16b13eee8ad7895… | x_refsource_MISC |
| https://github.com/h2o/h2o/commit/1ed32b23f999acf… | x_refsource_MISC |
| https://h2o.examp1e.net/configure/http3_directives.html | x_refsource_MISC |
Impacted products
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CVE-2024-45402 (GCVE-0-2024-45402)
Vulnerability from nvd – Published: 2024-10-11 14:38 – Updated: 2024-10-15 16:11
VLAI
EPSS
VEX
Title
Picotls double free
Summary
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. When parsing a spoofed TLS handshake message, picotls (specifically, bindings within picotls that call the crypto libraries) may attempt to free the same memory twice. This double free occurs during the disposal of multiple objects without any intervening calls to malloc Typically, this triggers the malloc implementation to detect the error and abort the process. However, depending on the internals of malloc and the crypto backend being used, the flaw could potentially lead to a use-after-free scenario, which might allow for arbitrary code execution. The vulnerability is addressed with commit 9b88159ce763d680e4a13b6e8f3171ae923a535d.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:51 UTC
CWE
- CWE-415 - Double Free
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/picotls/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/h2o/picotls/commit/9b88159ce76… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| h2o | picotls |
Affected:
< 9b88159ce763d680e4a13b6e8f3171ae923a535d
|
|
| h2o_project | picotls |
Affected:
0 , < 9b88159ce763d680e4a13b6e8f3171ae923a535d
(custom)
cpe:2.3:a:h2o_project:picotls:*:*:*:*:*:*:*:* |
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CVE-2024-45397 (GCVE-0-2024-45397)
Vulnerability from nvd – Published: 2024-10-11 14:24 – Updated: 2024-10-11 14:42
VLAI
EPSS
VEX
Title
H2O alllows bypassing address-based access control with 0-RTT
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:42 UTC
CWE
- CWE-284 - Improper Access Control
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/15ed15a2efb83a7… | x_refsource_MISC |
| https://h2o.examp1e.net/configure/http3_directives.html | x_refsource_MISC |
Impacted products
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CVE-2024-45396 (GCVE-0-2024-45396)
Vulnerability from nvd – Published: 2024-10-11 14:36 – Updated: 2024-10-15 16:11
VLAI
EPSS
VEX
Title
Quicly assertion failures
Summary
Quicly is an IETF QUIC protocol implementation. Quicly up to commtit d720707 is susceptible to a denial-of-service attack. A remote attacker can exploit these bugs to trigger an assertion failure that crashes process using quicly. The vulnerability is addressed with commit 2a95896104901589c495bc41460262e64ffcad5c.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:58 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/quicly/security/advisories… | x_refsource_CONFIRM |
| https://github.com/h2o/quicly/commit/2a9589610490… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| h2o | quicly |
Affected:
< 2a95896104901589c495bc41460262e64ffcad5c
|
|
| h2o_project | quicly |
Affected:
0 , < 2a95896104901589c495bc41460262e64ffcad5c
(custom)
cpe:2.3:a:h2o_project:quicly:*:*:*:*:*:*:*:* |
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CVE-2024-25622 (GCVE-0-2024-25622)
Vulnerability from nvd – Published: 2024-10-11 14:20 – Updated: 2024-10-11 14:46
VLAI
EPSS
VEX
Title
H2O ignores headers configuration directives
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:46 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/issues/3332 | x_refsource_MISC |
| https://github.com/h2o/h2o/commit/123f5e2b65dcdba… | x_refsource_MISC |
Impacted products
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CVE-2023-50247 (GCVE-0-2023-50247)
Vulnerability from nvd – Published: 2023-12-12 19:56 – Updated: 2024-08-02 22:09
VLAI
EPSS
VEX
Title
h2o QUIC state exhaustion DoS
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/d67e81d03be12a9… | x_refsource_MISC |
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CVE-2023-41337 (GCVE-0-2023-41337)
Vulnerability from nvd – Published: 2023-12-12 19:42 – Updated: 2024-08-02 19:01
VLAI
EPSS
VEX
Title
h2o vulnerable to TLS session resumption misdirection
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent.
The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening.
Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server.
An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities.
A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.
Severity
6.1 (Medium)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/35760540337a47e… | x_refsource_MISC |
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CVE-2023-44487 (GCVE-0-2023-44487)
Vulnerability from nvd – Published: 2023-10-10 00:00 – Updated: 2026-07-14 12:03Summary
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
Severity
7.5 (High)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-23 20:34 UTC
CWE
- n/a
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
173 references
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| ietf | http |
Affected:
2.0
cpe:2.3:a:ietf:http:2.0:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SINEC NMS |
Affected:
0 , < V3.0
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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CVE-2023-30847 (GCVE-0-2023-30847)
Vulnerability from nvd – Published: 2023-04-27 14:08 – Updated: 2025-01-30 19:51
VLAI
EPSS
VEX
Title
H2O vulnerable to read from uninitialized pointer in the reverse proxy handler
Summary
H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-30 19:51 UTC
CWE
- CWE-824 - Access of Uninitialized Pointer
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/pull/3229 | x_refsource_MISC |
| https://github.com/h2o/h2o/commit/f010336bab16283… | x_refsource_MISC |
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CVE-2022-29482 (GCVE-0-2022-29482)
Vulnerability from nvd – Published: 2022-06-14 07:05 – Updated: 2024-08-03 06:26
VLAI
EPSS
VEX
Summary
'Mobaoku-Auction&Flea Market' App for iOS versions prior to 5.5.16 improperly verifies server certificates, which may allow an attacker to eavesdrop on an encrypted communication via a man-in-the-middle attack.
Severity
No CVSS data available.
CWE
- Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://jvn.jp/en/jp/JVN13878856/index.html | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| DeNA Co., Ltd. | Mobaoku-Auction & Flea Market App for iOS |
Affected:
versions prior to 5.5.16
|
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CVE-2021-43848 (GCVE-0-2021-43848)
Vulnerability from nvd – Published: 2022-02-01 12:13 – Updated: 2025-04-23 19:08
VLAI
EPSS
VEX
Title
Unititialized memory access in h2o
Summary
h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 14:11 UTC
CWE
- CWE-908 - Use of Uninitialized Resource
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/8c0eca3 | x_refsource_MISC |
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CVE-2018-0608 (GCVE-0-2018-0608)
Vulnerability from nvd – Published: 2018-06-26 14:00 – Updated: 2024-08-05 03:28
VLAI
EPSS
VEX
Summary
Buffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via unspecified vectors.
Severity
No CVSS data available.
CWE
- Buffer Overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| http://jvn.jp/en/jp/JVN93226941/index.html | third-party-advisoryx_refsource_JVN |
| https://github.com/h2o/h2o/issues/1775 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kazuho Oku | H2O |
Affected:
version 2.2.4 and earlier
|
Date Public
2018-06-26 00:00
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CVE-2017-10908 (GCVE-0-2017-10908)
Vulnerability from nvd – Published: 2017-12-22 14:00 – Updated: 2024-08-05 17:50
VLAI
EPSS
VEX
Summary
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header.
Severity
No CVSS data available.
CWE
- Denial-of-service (DoS)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/issues/1544 | x_refsource_CONFIRM |
| https://jvn.jp/en/jp/JVN84182676/index.html | third-party-advisoryx_refsource_JVN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kazuho Oku | H2O |
Affected:
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|
Date Public
2017-12-14 00:00
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CVE-2017-10872 (GCVE-0-2017-10872)
Vulnerability from nvd – Published: 2017-12-22 14:00 – Updated: 2024-08-05 17:50
VLAI
EPSS
VEX
Summary
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via unspecified vectors.
Severity
No CVSS data available.
CWE
- Denial-of-service (DoS)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/issues/1543 | x_refsource_CONFIRM |
| https://jvn.jp/en/jp/JVN84182676/index.html | third-party-advisoryx_refsource_JVN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kazuho Oku | H2O |
Affected:
version 2.2.3 and earlier
|
Date Public
2017-12-14 00:00
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CVE-2017-10869 (GCVE-0-2017-10869)
Vulnerability from nvd – Published: 2017-12-22 14:00 – Updated: 2024-08-05 17:50
VLAI
EPSS
VEX
Summary
Buffer overflow in H2O version 2.2.2 and earlier allows remote attackers to cause a denial-of-service in the server via unspecified vectors.
Severity
No CVSS data available.
CWE
- Buffer Overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/issues/1460 | x_refsource_CONFIRM |
| https://jvn.jp/en/jp/JVN84182676/index.html | third-party-advisoryx_refsource_JVN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kazuho Oku | H2O |
Affected:
version 2.2.2 and earlier
|
Date Public
2017-10-18 00:00
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CVE-2017-10868 (GCVE-0-2017-10868)
Vulnerability from nvd – Published: 2017-12-22 14:00 – Updated: 2024-08-05 17:50
VLAI
EPSS
VEX
Summary
H2O version 2.2.2 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/1 header.
Severity
No CVSS data available.
CWE
- Denial-of-service (DoS)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/issues/1459 | x_refsource_CONFIRM |
| https://jvn.jp/en/jp/JVN84182676/index.html | third-party-advisoryx_refsource_JVN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kazuho Oku | H2O |
Affected:
version 2.2.2 and earlier
|
Date Public
2017-10-18 00:00
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CVE-2024-45402 (GCVE-0-2024-45402)
Vulnerability from cvelistv5 – Published: 2024-10-11 14:38 – Updated: 2024-10-15 16:11
VLAI
EPSS
VEX
Title
Picotls double free
Summary
Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. When parsing a spoofed TLS handshake message, picotls (specifically, bindings within picotls that call the crypto libraries) may attempt to free the same memory twice. This double free occurs during the disposal of multiple objects without any intervening calls to malloc Typically, this triggers the malloc implementation to detect the error and abort the process. However, depending on the internals of malloc and the crypto backend being used, the flaw could potentially lead to a use-after-free scenario, which might allow for arbitrary code execution. The vulnerability is addressed with commit 9b88159ce763d680e4a13b6e8f3171ae923a535d.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:51 UTC
CWE
- CWE-415 - Double Free
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/picotls/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/h2o/picotls/commit/9b88159ce76… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| h2o | picotls |
Affected:
< 9b88159ce763d680e4a13b6e8f3171ae923a535d
|
|
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Affected:
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CVE-2024-45396 (GCVE-0-2024-45396)
Vulnerability from cvelistv5 – Published: 2024-10-11 14:36 – Updated: 2024-10-15 16:11
VLAI
EPSS
VEX
Title
Quicly assertion failures
Summary
Quicly is an IETF QUIC protocol implementation. Quicly up to commtit d720707 is susceptible to a denial-of-service attack. A remote attacker can exploit these bugs to trigger an assertion failure that crashes process using quicly. The vulnerability is addressed with commit 2a95896104901589c495bc41460262e64ffcad5c.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:58 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/quicly/security/advisories… | x_refsource_CONFIRM |
| https://github.com/h2o/quicly/commit/2a9589610490… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| h2o | quicly |
Affected:
< 2a95896104901589c495bc41460262e64ffcad5c
|
|
| h2o_project | quicly |
Affected:
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CVE-2024-45403 (GCVE-0-2024-45403)
Vulnerability from cvelistv5 – Published: 2024-10-11 14:28 – Updated: 2024-10-11 14:40
VLAI
EPSS
VEX
Title
H2O assertion failure when HTTP/3 requests are cancelled
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When h2o is configured as a reverse proxy and HTTP/3 requests are cancelled by the client, h2o might crash due to an assertion failure. The crash can be exploited by an attacker to mount a Denial-of-Service attack. By default, the h2o standalone server automatically restarts, minimizing the impact. However, HTTP requests that were served concurrently will still be disrupted. The vulnerability has been addressed in commit 1ed32b2. Users may disable the use of HTTP/3 to mitigate the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:40 UTC
CWE
- CWE-617 - Reachable Assertion
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/16b13eee8ad7895… | x_refsource_MISC |
| https://github.com/h2o/h2o/commit/1ed32b23f999acf… | x_refsource_MISC |
| https://h2o.examp1e.net/configure/http3_directives.html | x_refsource_MISC |
Impacted products
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CVE-2024-45397 (GCVE-0-2024-45397)
Vulnerability from cvelistv5 – Published: 2024-10-11 14:24 – Updated: 2024-10-11 14:42
VLAI
EPSS
VEX
Title
H2O alllows bypassing address-based access control with 0-RTT
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. When an HTTP request using TLS/1.3 early data on top of TCP Fast Open or QUIC 0-RTT packets is received and the IP-address-based access control is used, the access control does not detect and prohibit HTTP requests conveyed by packets with a spoofed source address. This behavior allows attackers on the network to execute HTTP requests from addresses that are otherwise rejected by the address-based access control. The vulnerability has been addressed in commit 15ed15a. Users may disable the use of TCP FastOpen and QUIC to mitigate the issue.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:42 UTC
CWE
- CWE-284 - Improper Access Control
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/15ed15a2efb83a7… | x_refsource_MISC |
| https://h2o.examp1e.net/configure/http3_directives.html | x_refsource_MISC |
Impacted products
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CVE-2024-25622 (GCVE-0-2024-25622)
Vulnerability from cvelistv5 – Published: 2024-10-11 14:20 – Updated: 2024-10-11 14:46
VLAI
EPSS
VEX
Title
H2O ignores headers configuration directives
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-11 14:46 UTC
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/issues/3332 | x_refsource_MISC |
| https://github.com/h2o/h2o/commit/123f5e2b65dcdba… | x_refsource_MISC |
Impacted products
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CVE-2023-50247 (GCVE-0-2023-50247)
Vulnerability from cvelistv5 – Published: 2023-12-12 19:56 – Updated: 2024-08-02 22:09
VLAI
EPSS
VEX
Title
h2o QUIC state exhaustion DoS
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up to commit 43f86e5 (in version 2.3.0-beta and prior), is susceptible to a state exhaustion attack. When H2O is serving HTTP/3, a remote attacker can exploit this vulnerability to progressively increase the memory retained by the QUIC stack. This can eventually cause H2O to abort due to memory exhaustion. The vulnerability has been resolved in commit d67e81d03be12a9d53dc8271af6530f40164cd35. HTTP/1 and HTTP/2 are not affected by this vulnerability as they do not use QUIC. Administrators looking to mitigate this issue without upgrading can disable HTTP/3 support.
Severity
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/d67e81d03be12a9… | x_refsource_MISC |
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CVE-2023-41337 (GCVE-0-2023-41337)
Vulnerability from cvelistv5 – Published: 2023-12-12 19:42 – Updated: 2024-08-02 19:01
VLAI
EPSS
VEX
Title
h2o vulnerable to TLS session resumption misdirection
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o is configured to listen to multiple addresses or ports with each of them using different backend servers managed by multiple entities, a malicious backend entity that also has the opportunity to observe or inject packets exchanged between the client and h2o may misdirect HTTPS requests going to other backends and observe the contents of that HTTPS request being sent.
The attack involves a victim client trying to resume a TLS connection and an attacker redirecting the packets to a different address or port than that intended by the client. The attacker must already have been configured by the administrator of h2o to act as a backend to one of the addresses or ports that the h2o instance listens to. Session IDs and tickets generated by h2o are not bound to information specific to the server address, port, or the X.509 certificate, and therefore it is possible for an attacker to force the victim connection to wrongfully resume against a different server address or port on which the same h2o instance is listening.
Once a TLS session is misdirected to resume to a server address / port that is configured to use an attacker-controlled server as the backend, depending on the configuration, HTTPS requests from the victim client may be forwarded to the attacker's server.
An H2O instance is vulnerable to this attack only if the instance is configured to listen to different addresses or ports using the listen directive at the host level and the instance is configured to connect to backend servers managed by multiple entities.
A patch is available at commit 35760540337a47e5150da0f4a66a609fad2ef0ab. As a workaround, one may stop using using host-level listen directives in favor of global-level ones.
Severity
6.1 (Medium)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/35760540337a47e… | x_refsource_MISC |
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CVE-2023-44487 (GCVE-0-2023-44487)
Vulnerability from cvelistv5 – Published: 2023-10-10 00:00 – Updated: 2026-07-14 12:03Summary
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
Severity
7.5 (High)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-23 20:34 UTC
CWE
- n/a
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
173 references
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| ietf | http |
Affected:
2.0
cpe:2.3:a:ietf:http:2.0:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
|
| Siemens | SINEC NMS |
Affected:
0 , < V3.0
(custom)
|
|
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
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CVE-2023-30847 (GCVE-0-2023-30847)
Vulnerability from cvelistv5 – Published: 2023-04-27 14:08 – Updated: 2025-01-30 19:51
VLAI
EPSS
VEX
Title
H2O vulnerable to read from uninitialized pointer in the reverse proxy handler
Summary
H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-30 19:51 UTC
CWE
- CWE-824 - Access of Uninitialized Pointer
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/pull/3229 | x_refsource_MISC |
| https://github.com/h2o/h2o/commit/f010336bab16283… | x_refsource_MISC |
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CVE-2022-29482 (GCVE-0-2022-29482)
Vulnerability from cvelistv5 – Published: 2022-06-14 07:05 – Updated: 2024-08-03 06:26
VLAI
EPSS
VEX
Summary
'Mobaoku-Auction&Flea Market' App for iOS versions prior to 5.5.16 improperly verifies server certificates, which may allow an attacker to eavesdrop on an encrypted communication via a man-in-the-middle attack.
Severity
No CVSS data available.
CWE
- Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://jvn.jp/en/jp/JVN13878856/index.html | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| DeNA Co., Ltd. | Mobaoku-Auction & Flea Market App for iOS |
Affected:
versions prior to 5.5.16
|
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CVE-2021-43848 (GCVE-0-2021-43848)
Vulnerability from cvelistv5 – Published: 2022-02-01 12:13 – Updated: 2025-04-23 19:08
VLAI
EPSS
VEX
Title
Unititialized memory access in h2o
Summary
h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 14:11 UTC
CWE
- CWE-908 - Use of Uninitialized Resource
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/8c0eca3 | x_refsource_MISC |
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CVE-2018-0608 (GCVE-0-2018-0608)
Vulnerability from cvelistv5 – Published: 2018-06-26 14:00 – Updated: 2024-08-05 03:28
VLAI
EPSS
VEX
Summary
Buffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via unspecified vectors.
Severity
No CVSS data available.
CWE
- Buffer Overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| http://jvn.jp/en/jp/JVN93226941/index.html | third-party-advisoryx_refsource_JVN |
| https://github.com/h2o/h2o/issues/1775 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kazuho Oku | H2O |
Affected:
version 2.2.4 and earlier
|
Date Public
2018-06-26 00:00
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CVE-2017-10869 (GCVE-0-2017-10869)
Vulnerability from cvelistv5 – Published: 2017-12-22 14:00 – Updated: 2024-08-05 17:50
VLAI
EPSS
VEX
Summary
Buffer overflow in H2O version 2.2.2 and earlier allows remote attackers to cause a denial-of-service in the server via unspecified vectors.
Severity
No CVSS data available.
CWE
- Buffer Overflow
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/issues/1460 | x_refsource_CONFIRM |
| https://jvn.jp/en/jp/JVN84182676/index.html | third-party-advisoryx_refsource_JVN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kazuho Oku | H2O |
Affected:
version 2.2.2 and earlier
|
Date Public
2017-10-18 00:00
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CVE-2017-10908 (GCVE-0-2017-10908)
Vulnerability from cvelistv5 – Published: 2017-12-22 14:00 – Updated: 2024-08-05 17:50
VLAI
EPSS
VEX
Summary
H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header.
Severity
No CVSS data available.
CWE
- Denial-of-service (DoS)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/issues/1544 | x_refsource_CONFIRM |
| https://jvn.jp/en/jp/JVN84182676/index.html | third-party-advisoryx_refsource_JVN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kazuho Oku | H2O |
Affected:
version 2.2.3 and earlier
|
Date Public
2017-12-14 00:00
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