CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
6465 vulnerabilities reference this CWE, most recent first.
GHSA-FG72-Q65G-WM5W
Vulnerability from github – Published: 2026-09-06 12:30 – Updated: 2026-09-30 23:46Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-q5pr-72pq-83v3. This link is maintained to preserve external references.
Original Description
h3 versions before 2.0.1-rc.18 fail to validate the chunk count parsed from user-controlled cookie values in setChunkedCookie() and deleteChunkedCookie() functions. Attackers can send a crafted cookie header with an extremely large chunk count to trigger an O(n²) cleanup loop that hangs the server process.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c 2.0.1-rc.18"
},
"package": {
"ecosystem": "npm",
"name": "h3"
},
"ranges": [
{
"events": [
{
"introduced": "2.0.0-beta.4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2026-09-30T23:46:36Z",
"nvd_published_at": "2026-09-06T12:17:15Z",
"severity": "HIGH"
},
"details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-q5pr-72pq-83v3. This link is maintained to preserve external references.\n\n## Original Description\nh3 versions before 2.0.1-rc.18 fail to validate the chunk count parsed from user-controlled cookie values in setChunkedCookie() and deleteChunkedCookie() functions. Attackers can send a crafted cookie header with an extremely large chunk count to trigger an O(n\u00b2) cleanup loop that hangs the server process.",
"id": "GHSA-fg72-q65g-wm5w",
"modified": "2026-09-30T23:46:36Z",
"published": "2026-09-06T12:30:23Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/h3js/h3/security/advisories/GHSA-q5pr-72pq-83v3"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86250"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/h3-before-2.0.1-rc.18-denial-of-service-via-unbounded-chunked-cookie"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
],
"summary": "Duplicate Advisory: H3: Unbounded Chunked Cookie Count in Session Cleanup Loop may Lead to Denial of Service",
"withdrawn": "2026-09-30T23:46:36Z"
}
GHSA-FG82-QF75-PXR7
Vulnerability from github – Published: 2026-09-08 21:34 – Updated: 2026-09-08 21:34ColdFusion is affected by an Uncontrolled Resource Consumption vulnerability that could lead to application denial-of-service. An attacker could exploit this vulnerability to exhaust system resources, resulting in an application denial-of-service condition. Exploitation of this issue does not require user interaction.
{
"affected": [],
"aliases": [
"CVE-2026-76000"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-08T20:18:23Z",
"severity": "MODERATE"
},
"details": "ColdFusion is affected by an Uncontrolled Resource Consumption vulnerability that could lead to application denial-of-service. An attacker could exploit this vulnerability to exhaust system resources, resulting in an application denial-of-service condition. Exploitation of this issue does not require user interaction.",
"id": "GHSA-fg82-qf75-pxr7",
"modified": "2026-09-08T21:34:28Z",
"published": "2026-09-08T21:34:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76000"
},
{
"type": "WEB",
"url": "https://helpx.adobe.com/security/products/coldfusion/apsb26-119.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-FGWF-CXWH-J7GG
Vulnerability from github – Published: 2023-04-19 21:30 – Updated: 2024-04-04 03:36In parseUsesPermission of ParsingPackageUtils.java, there is a possible boot loop due to resource exhaustion. This could lead to local denial of service with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-259942609
{
"affected": [],
"aliases": [
"CVE-2023-21090"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-04-19T20:15:11Z",
"severity": "MODERATE"
},
"details": "In parseUsesPermission of ParsingPackageUtils.java, there is a possible boot loop due to resource exhaustion. This could lead to local denial of service with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-259942609",
"id": "GHSA-fgwf-cxwh-j7gg",
"modified": "2024-04-04T03:36:01Z",
"published": "2023-04-19T21:30:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-21090"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/2023-04-01"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-FGWH-FRH9-VM43
Vulnerability from github – Published: 2022-05-24 17:05 – Updated: 2023-01-20 21:30In Pure-FTPd 1.0.49, a stack exhaustion issue was discovered in the listdir function in ls.c.
{
"affected": [],
"aliases": [
"CVE-2019-20176"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2019-12-31T15:15:00Z",
"severity": "MODERATE"
},
"details": "In Pure-FTPd 1.0.49, a stack exhaustion issue was discovered in the listdir function in ls.c.",
"id": "GHSA-fgwh-frh9-vm43",
"modified": "2023-01-20T21:30:27Z",
"published": "2022-05-24T17:05:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-20176"
},
{
"type": "WEB",
"url": "https://github.com/jedisct1/pure-ftpd/commit/aea56f4bcb9948d456f3fae4d044fd3fa2e19706"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AHZG5FPCRMCB6Z3L7FPICC6BZ5ZATFTO"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PICL3U2J4EPGBLOE555Y5RAZTQL3WBBV"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-FH29-P7GC-QWHP
Vulnerability from github – Published: 2022-05-14 01:37 – Updated: 2022-05-14 01:37Dell EMC RecoverPoint versions prior to 5.1.2.1 and RecoverPoint for VMs versions prior to 5.2.0.2 contain an uncontrolled resource consumption vulnerability. A malicious boxmgmt user may potentially be able to consume large amount of CPU bandwidth to make the system slow or to determine the existence of any system file via Boxmgmt CLI.
{
"affected": [],
"aliases": [
"CVE-2018-15772"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-11-13T14:29:00Z",
"severity": "HIGH"
},
"details": "Dell EMC RecoverPoint versions prior to 5.1.2.1 and RecoverPoint for VMs versions prior to 5.2.0.2 contain an uncontrolled resource consumption vulnerability. A malicious boxmgmt user may potentially be able to consume large amount of CPU bandwidth to make the system slow or to determine the existence of any system file via Boxmgmt CLI.",
"id": "GHSA-fh29-p7gc-qwhp",
"modified": "2022-05-14T01:37:11Z",
"published": "2022-05-14T01:37:11Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-15772"
},
{
"type": "WEB",
"url": "https://seclists.org/fulldisclosure/2018/Nov/34"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/105916"
},
{
"type": "WEB",
"url": "http://www.securitytracker.com/id/1042059"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-FH2C-86XM-PM2X
Vulnerability from github – Published: 2025-03-20 12:32 – Updated: 2025-10-15 16:10A Denial of Service (DoS) vulnerability exists in berriai/litellm version v1.44.5. This vulnerability can be exploited by appending characters, such as dashes (-), to the end of a multipart boundary in an HTTP request. The server continuously processes each character, leading to excessive resource consumption and rendering the service unavailable. The issue is unauthenticated and does not require any user interaction, impacting all users of the service.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "litellm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.56.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2024-8984"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-770"
],
"github_reviewed": true,
"github_reviewed_at": "2025-03-20T20:56:29Z",
"nvd_published_at": "2025-03-20T10:15:45Z",
"severity": "HIGH"
},
"details": "A Denial of Service (DoS) vulnerability exists in berriai/litellm version v1.44.5. This vulnerability can be exploited by appending characters, such as dashes (-), to the end of a multipart boundary in an HTTP request. The server continuously processes each character, leading to excessive resource consumption and rendering the service unavailable. The issue is unauthenticated and does not require any user interaction, impacting all users of the service.",
"id": "GHSA-fh2c-86xm-pm2x",
"modified": "2025-10-15T16:10:41Z",
"published": "2025-03-20T12:32:49Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-8984"
},
{
"type": "WEB",
"url": "https://github.com/BerriAI/litellm/commit/4f49f836aa844ac9b6bfbeff27e6f6b2b9cf3f61"
},
{
"type": "PACKAGE",
"url": "https://github.com/BerriAI/litellm"
},
{
"type": "WEB",
"url": "https://github.com/BerriAI/litellm/blob/8c5ff150f6142608ffe968e4e68429f978fda187/litellm/tests/test_spend_logs.py#L242"
},
{
"type": "WEB",
"url": "https://huntr.com/bounties/554fc76b-3097-4223-b4cf-110b853e9355"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "LiteLLM Vulnerable to Denial of Service (DoS) via Crafted HTTP Request"
}
GHSA-FH2R-99Q2-6MMG
Vulnerability from github – Published: 2023-08-22 18:06 – Updated: 2023-09-19 22:28When this crate is given a pathological certificate chain to validate, it will spend CPU time exponential with the number of candidate certificates at each step of path building.
Both TLS clients and TLS servers that accept client certificate are affected.
We now give each path building operation a budget of 100 signature verifications.
The original webpki crate is also affected, see GHSA-8qv2-5vq6-g2g7.
This was previously reported in the original crate https://github.com/briansmith/webpki/issues/69 and re-reported to us recently.
{
"affected": [
{
"package": {
"ecosystem": "crates.io",
"name": "rustls-webpki"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.100.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "crates.io",
"name": "rustls-webpki"
},
"ranges": [
{
"events": [
{
"introduced": "0.101.0"
},
{
"fixed": "0.101.4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2023-08-22T18:06:15Z",
"nvd_published_at": null,
"severity": "HIGH"
},
"details": "When this crate is given a pathological certificate chain to validate, it will spend CPU time exponential with the number of candidate certificates at each step of path building.\n\nBoth TLS clients and TLS servers that accept client certificate are affected.\n\nWe now give each path building operation a budget of 100 signature verifications.\n\nThe original `webpki` crate is also affected, see [GHSA-8qv2-5vq6-g2g7](https://github.com/advisories/GHSA-8qv2-5vq6-g2g7).\n\nThis was previously reported in the original crate \u003chttps://github.com/briansmith/webpki/issues/69\u003e and re-reported to us recently.",
"id": "GHSA-fh2r-99q2-6mmg",
"modified": "2023-09-19T22:28:38Z",
"published": "2023-08-22T18:06:15Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/rustls/webpki/commit/4ea052366f342a06344aab589565179b59b342d3"
},
{
"type": "WEB",
"url": "https://github.com/rustls/webpki/commit/dcad2406c92169b72c110dd12183fcc74035b683"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-8qv2-5vq6-g2g7"
},
{
"type": "PACKAGE",
"url": "https://github.com/rustls/webpki"
},
{
"type": "WEB",
"url": "https://rustsec.org/advisories/RUSTSEC-2023-0053.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "rustls-webpki: CPU denial of service in certificate path building"
}
GHSA-FH5R-CRHR-QRRQ
Vulnerability from github – Published: 2025-01-21 12:30 – Updated: 2025-12-16 23:29A potential denial of service vulnerability is present in versions of Apache CXF before 3.5.10, 3.6.5 and 4.0.6. In some edge cases, the CachedOutputStream instances may not be closed and, if backed by temporary files, may fill up the file system (it applies to servers and clients).
{
"affected": [
{
"package": {
"ecosystem": "Maven",
"name": "org.apache.cxf:cxf-core"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "org.apache.cxf:cxf-core"
},
"ranges": [
{
"events": [
{
"introduced": "3.6.0"
},
{
"fixed": "3.6.5"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "org.apache.cxf:cxf-core"
},
"ranges": [
{
"events": [
{
"introduced": "4.0.0"
},
{
"fixed": "4.0.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-23184"
],
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2025-01-21T20:15:57Z",
"nvd_published_at": "2025-01-21T10:15:08Z",
"severity": "HIGH"
},
"details": "A potential denial of service vulnerability is present in versions of Apache CXF before\u00a03.5.10, 3.6.5 and 4.0.6.\u00a0In some edge cases, the CachedOutputStream instances may not be closed and, if backed by temporary files, may fill up the file system (it applies to servers and clients).",
"id": "GHSA-fh5r-crhr-qrrq",
"modified": "2025-12-16T23:29:48Z",
"published": "2025-01-21T12:30:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-23184"
},
{
"type": "WEB",
"url": "https://github.com/apache/cxf/pull/2048"
},
{
"type": "WEB",
"url": "https://github.com/apache/cxf/pull/2111"
},
{
"type": "PACKAGE",
"url": "https://github.com/apache/cxf"
},
{
"type": "WEB",
"url": "https://issues.apache.org/jira/browse/CXF-7396"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread/lfs8l63rnctnj2skfrxyys7v8fgnt122"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20250214-0003"
},
{
"type": "WEB",
"url": "https://www.vicarius.io/vsociety/posts/cve-2025-23184-detect-apache-cxf-vulnerability"
},
{
"type": "WEB",
"url": "https://www.vicarius.io/vsociety/posts/cve-2025-23184-mitigate-apache-cxf-vulnerability"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2025/01/20/3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Apache CXF: Denial of Service vulnerability with temporary files"
}
GHSA-FH6J-MGH8-7PRH
Vulnerability from github – Published: 2024-01-25 21:32 – Updated: 2026-10-02 03:30An out-of-memory flaw was found in libtiff that could be triggered by passing a crafted tiff file to the TIFFRasterScanlineSize64() API. This flaw allows a remote attacker to cause a denial of service via a crafted input with a size smaller than 379 KB.
{
"affected": [],
"aliases": [
"CVE-2023-52355"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-01-25T20:15:38Z",
"severity": "HIGH"
},
"details": "An out-of-memory flaw was found in libtiff that could be triggered by passing a crafted tiff file to the TIFFRasterScanlineSize64() API. This flaw allows a remote attacker to cause a denial of service via a crafted input with a size smaller than 379 KB.",
"id": "GHSA-fh6j-mgh8-7prh",
"modified": "2026-10-02T03:30:58Z",
"published": "2024-01-25T21:32:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52355"
},
{
"type": "WEB",
"url": "https://gitlab.com/libtiff/libtiff/-/issues/621"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2251326"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2023-52355"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:74674"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:74463"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:74462"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:74461"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:74460"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:74459"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:74458"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:73962"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:73961"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:73960"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:73959"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:73909"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:49671"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:43537"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:41892"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:3462"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:3461"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2025:23080"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2025:23079"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2025:23078"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2025:21994"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2025:20801"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-FH77-7RC7-3797
Vulnerability from github – Published: 2022-10-15 12:01 – Updated: 2022-10-18 19:00In sensor driver, there is a possible out of bounds write due to a missing bounds check. This could lead to local denial of service in kernel.
{
"affected": [],
"aliases": [
"CVE-2022-39128"
],
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-10-14T19:15:00Z",
"severity": "MODERATE"
},
"details": "In sensor driver, there is a possible out of bounds write due to a missing bounds check. This could lead to local denial of service in kernel.",
"id": "GHSA-fh77-7rc7-3797",
"modified": "2022-10-18T19:00:31Z",
"published": "2022-10-15T12:01:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-39128"
},
{
"type": "WEB",
"url": "https://www.unisoc.com/en_us/secy/announcementDetail/1575654905820020738"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Mitigation
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
Mitigation
- Mitigation of resource exhaustion attacks requires that the target system either:
- The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
- The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- recognizes the attack and denies that user further access for a given amount of time, or
- uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Mitigation
Ensure that protocols have specific limits of scale placed on them.
Mitigation
Ensure that all failures in resource allocation place the system into a safe posture.
CAPEC-147: XML Ping of the Death
An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
CAPEC-227: Sustained Client Engagement
An adversary attempts to deny legitimate users access to a resource by continually engaging a specific resource in an attempt to keep the resource tied up as long as possible. The adversary's primary goal is not to crash or flood the target, which would alert defenders; rather it is to repeatedly perform actions or abuse algorithmic flaws such that a given resource is tied up and not available to a legitimate user. By carefully crafting a requests that keep the resource engaged through what is seemingly benign requests, legitimate users are limited or completely denied access to the resource.
CAPEC-492: Regular Expression Exponential Blowup
An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.