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ALSA-2023:6679 — Moderate: curl security update

Affected: AlmaLinux:9: curl, AlmaLinux:9: curl-minimal, AlmaLinux:9: libcurl, AlmaLinux:9: libcurl-devel, AlmaLinux:9: libcurl-minimal

The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.

Security Fix(es):

* curl: GSS delegation too eager connection re-use (CVE-2023-27536) * curl: TELNET option IAC injection (CVE-2023-27533) * curl: SFTP path ~ resolving discrepancy (CVE-2023-27534) * curl: SSH connection too eager reuse still (CVE-2023-27538)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

bdu:2023-02103

Withdrawn: BELL-CVE-2023-27538 — CVE-2023-27538 does not affect BellSoft software

Withdrawn by the publisher.

certfr-2023-avi-0428 — De multiples vulnérabilités ont été découvertes dans les produits Splunk. Certaines d'entre…

certfr-2023-avi-0428

Withdrawn: CLEANSTART-2026-AY18527 — Security fixes for CVE-2014-0138, CVE-2014-0139, CVE-2016-5419, CVE-2016-5420, CVE-2016-5421, CVE-2016-7141, CVE-2016-7…

Withdrawn by the publisher.

Affected: CleanStart: curl

Multiple security vulnerabilities affect the curl package. These issues are resolved in later releases. See references for individual vulnerability details.

EUVD-2026-243429

fkie_cve-2023-27538

An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.

GHSA-cgj3-cvg6-pcvh

An authentication bypass vulnerability exists in libcurl v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.

gsd-2023-27538

ICSA-23-348-10 — Siemens SIMATIC S7-1500

expat 2.1.0 and earlier does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE. shadow: TOCTOU (time-of-check time-of-use) race condition when copying and removing directory trees run-mailcap in the Debian mime-support package before 3.52-1+deb7u1 allows context-dependent attackers to execute arbitrary commands via shell metacharacters in a filename. In Python (aka CPython) up to 3.10.8, the mailcap module does not add escape characters into commands discovered in the system mailcap file. This may allow attackers to inject shell commands into applications that call mailcap.findmatch with untrusted input (if they lack validation of user-provided filenames or arguments). The fix is also back-ported to 3.7, 3.8, 3.9 Use-after-free vulnerability in bzip2recover in bzip2 1.0.6 allows remote attackers to cause a denial of service (crash) via a crafted bzip2 file, related to block ends set to before the start o…

msrc_CVE-2023-27538 — An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH c…

msrc_CVE-2023-27538

OESA-2023-1193 — curl security update

Affected: openEuler:22.03-LTS-SP1: curl

cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols. Security Fix(es): libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, several FTP settings were left out from the configuration match checks, making them match too easily. The settings in questions are `CURLOPT_FTP_ACCOUNT`, `CURLOPT_FTP_ALTERNATIVE_TO_USER`, `CURLOPT_FTP_SSL_CCC` and `CURLOPT_USE_SSL` level.(CVE-2023-27535) libcurl would reuse a previously created connection even when an SSH related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, two SSH settings were left out from the configuration match checks, making them match too easily.(CVE-2023-27538) libcurl would reuse a previously created connection even when the GSS delegation (`CURLOPT_GSSAPI_DELEGATION`) option had been changed that could have changed the user's permissions in a second transfer. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, this GSS delegation setting was left out from the configuration match checks, making them match too easily, affecting krb5/kerberos/negotiate/GSSAPI transfers.(CVE-2023-27536) curl support…

openSUSE-SU-2024:12812-1 — curl-8.0.1-1.1 on GA media

curl-8.0.1-1.1 on GA media

SUSE-SU-2023:0865-1 — Security update for curl

Security update for curl

UBUNTU-CVE-2023-27538

Affected: Ubuntu:18.04:LTS: curl, Ubuntu:20.04:LTS: curl, Ubuntu:22.04:LTS: curl

WID-SEC-W-2023-0690 — cURL: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in cURL ausnutzen, um Informationen offenzulegen, Sicherheitsvorkehrungen zu umgehen oder unbekannte Auswirkungen zu verursachen.