high
8.2
CWE
119 122 787
Advisory Published
CVE Published
CVE Published
Updated

CVE-2023-6779: Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()

First published: Wed Dec 13 2023(Updated: )

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.

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

Affected SoftwareAffected VersionHow to fix
redhat/glibc<2.39
2.39
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
GNU C Library=2.37
GNU C Library=2.36
GNU C Library>=2.37<2.39
Fedora=38
Fedora=39
GNU C Library<2.39

Remedy

https://sourceware.org/git/?p=glibc.git;a=commit;h=7e5a0c286da33159d47d0122007aac016f3e02cd

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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-2023-6779?

    CVE-2023-6779 has a high severity rating due to its potential to allow remote code execution via a heap-based buffer overflow.

  • How do I fix CVE-2023-6779?

    To fix CVE-2023-6779, upgrade to glibc version 2.39 or later, or apply patches provided by your operating system vendor.

  • What versions of glibc are affected by CVE-2023-6779?

    CVE-2023-6779 affects glibc versions 2.36 and 2.37, and prior versions before 2.39.

  • Is CVE-2023-6779 present in any Linux distributions?

    Yes, CVE-2023-6779 is present in various Linux distributions that utilize vulnerable versions of the glibc library.

  • What are the potential consequences of exploiting CVE-2023-6779?

    Exploiting CVE-2023-6779 can lead to unauthorized access and the ability to execute arbitrary code with elevated privileges.

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