CVE-2023-6246: glibc Heap Overflow — Exploit

Description

A heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer.

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CVSS v3.1 Score

8.4

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-122 CWE-122

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
gnu	glibc	2.36 — 2.39
fedoraproject	fedora	All
fedoraproject	fedora	All

References

Exploits

http://packetstormsecurity.com/files/176931/glibc-qsort-Out-Of-Bounds-Read-Write.html http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html http://seclists.org/fulldisclosure/2024/Feb/3 http://seclists.org/fulldisclosure/2024/Feb/5 https://www.openwall.com/lists/oss-security/2024/01/30/6 https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt http://packetstormsecurity.com/files/176931/glibc-qsort-Out-Of-Bounds-Read-Write.html http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html http://seclists.org/fulldisclosure/2024/Feb/3 http://seclists.org/fulldisclosure/2024/Feb/5 https://www.openwall.com/lists/oss-security/2024/01/30/6 https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt

Other References

https://access.redhat.com/security/cve/CVE-2023-6246 https://bugzilla.redhat.com/show_bug.cgi?id=2249053 https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/ https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/ https://security.gentoo.org/glsa/202402-01 https://security.netapp.com/advisory/ntap-20240216-0007/ https://access.redhat.com/security/cve/CVE-2023-6246 https://bugzilla.redhat.com/show_bug.cgi?id=2249053 https://lists.fedoraproject.org/archives/list/[email protected]/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/ https://lists.fedoraproject.org/archives/list/[email protected]/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/

Frequently Asked Questions

What is CVE-2023-6246? +

A heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer. It has a CVSS v3.1 base score of 8.4 (HIGH).

How severe is CVE-2023-6246? +

CVE-2023-6246 has a CVSS v3.1 score of 8.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2023-6246? +

CVE-2023-6246 affects products from fedoraproject, gnu, specifically: fedora, glibc. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-6246? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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