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
https://security-tracker.debian.org/tracker/DSA-5611-1
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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
https://security-tracker.debian.org/tracker/DSA-5611-1
Continue reading...
