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CVE-2023-6779

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Date: January 31, 2024

An off-by-one 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 these functions are called with a message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer.

Language: C

Severity Score

Related Resources (12)

https://bugzilla.redhat.com/show_bug.cgi?id=2254395
https://nvd.nist.gov/vuln/detail/CVE-2023-6779
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/
http://seclists.org/fulldisclosure/2024/Feb/3
https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt
https://www.openwall.com/lists/oss-security/2024/01/30/6
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/
https://access.redhat.com/security/cve/CVE-2023-6779
https://security.gentoo.org/glsa/202402-01
http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
https://security.netapp.com/advisory/ntap-20240223-0006/
https://www.mend.io/vulnerability-database/CVE-2023-6779

Severity Score

Weakness Type (CWE)

Out-of-bounds Write

CWE-787

Heap-based Buffer Overflow

CWE-122

Top Fix

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Upgrade Version

Upgrade to version glibc-2.39

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): HIGH

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