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- ------------------------------------------------------------------------- Debian Security Advisory DSA-5611-1 security@debian.org https://www.debian.org/security/ Salvatore Bonaccorso January 30, 2024 https://www.debian.org/security/faq
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Package : glibc
CVE ID : CVE-2023-6246 CVE-2023-6779 CVE-2023-6780

The Qualys Research Labs discovered several vulnerabilities in the GNU C Library's __vsyslog_internal() function (called by syslog() and
vsyslog()). A heap-based buffer overflow (CVE-2023-6246), an off-by-one
heap overflow (CVE-2023-6779) and an integer overflow (CVE-2023-6780)
can be exploited for privilege escalation or denial of service.

Details can be found in the Qualys advisory at https://www.qualys.com/2024/01/30/syslog

Additionally a memory corruption was discovered in the glibc's qsort() function, due to missing bounds check and when called by a program
with a non-transitive comparison function and a large number of attacker-controlled elements. As the use of qsort() with a
non-transitive comparison function is undefined according to POSIX and
ISO C standards, this is not considered a vulnerability in the glibc
itself. However the qsort() implementation was hardened against
misbehaving callers.

Details can be found in the Qualys advisory at https://www.qualys.com/2024/01/30/qsort

For the stable distribution (bookworm), these problems have been fixed in version 2.36-9+deb12u4.

We recommend that you upgrade your glibc packages.

For the detailed security status of glibc please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/glibc

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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