critical
9.8
CWE
119 131 190
Advisory Published
CVE Published
CVE Published
Updated

CVE-2023-6780: Glibc: integer overflow in __vsyslog_internal()

First published: Wed Dec 13 2023(Updated: )

An integer 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 very long message, leading to an incorrect calculation of the buffer size to store the message, resulting in undefined behavior. This issue affects glibc 2.37 and newer.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
ubuntu/glibc<2.38-1ubuntu6.1
2.38-1ubuntu6.1
ubuntu/glibc<2.37-15
2.37-15
debian/glibc
2.28-10+deb10u1
2.28-10+deb10u2
2.31-13+deb11u8
2.31-13+deb11u7
2.36-9+deb12u4
2.37-15
2.37-17
redhat/glibc<2.39
2.39
GNU C Library=2.37
GNU C Library=2.36
GNU C Library>=2.37<2.39
Fedora=38
Fedora=39

Remedy

https://sourceware.org/git?p=glibc.git;a=commit;h=ddf542da94caf97ff43cc2875c88749880b7259b

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2023-6780?

    CVE-2023-6780 has been classified as a critical vulnerability due to its potential for remote code execution and system compromise.

  • How do I fix CVE-2023-6780?

    To mitigate CVE-2023-6780, update the GNU C Library (glibc) to version 2.38 or later.

  • Which versions of glibc are affected by CVE-2023-6780?

    CVE-2023-6780 impacts glibc versions 2.36 and 2.37.

  • What exploitation methods exist for CVE-2023-6780?

    CVE-2023-6780 can be exploited through remote code execution via crafted syslog and vsyslog calls.

  • Is CVE-2023-6780 present in any major Linux distributions?

    Yes, CVE-2023-6780 affects several major Linux distributions, including Ubuntu, Debian, and Fedora.

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