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 Software | Affected Version | How to fix |
|---|---|---|
| GNU C Library (glibc) | =2.37 | |
| GNU C Library (glibc) | =2.36 | |
| GNU glibc | <2.39 | |
| Fedoraproject Fedora | =38 | |
| Fedoraproject Fedora | =39 | |
| redhat/glibc | <2.39 | 2.39 |
| GNU glibc | >=2.37<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 |
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Reference Links
- https://www.bleepingcomputer.com/news/security/new-linux-glibc-flaw-lets-attackers-get-root-on-major-distros/
- http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
- http://seclists.org/fulldisclosure/2024/Feb/3
- https://access.redhat.com/security/cve/CVE-2023-6779
- https://bugzilla.redhat.com/show_bug.cgi?id=2254395
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2FIH77VHY3KCRROCXOT6L27WMZXSJ2G/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWQ6BZJ6CV5UAW4VZSKJ6TO4KIW2KWAQ/
- https://security.gentoo.org/glsa/202402-01
- https://www.openwall.com/lists/oss-security/2024/01/30/6
- https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt
- https://security.netapp.com/advisory/ntap-20240223-0006/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2261988
- https://launchpad.net/bugs/cve/CVE-2023-6779
- https://sourceware.org/git/?p=glibc.git;a=commit;h=7e5a0c286da33159d47d0122007aac016f3e02cd
- https://sourceware.org/pipermail/libc-announce/2024/000037.html
- https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2024-0002;hb=HEAD
- https://sourceware.org/cgit/glibc/tree/advisories/GLIBC-SA-2024-0002
- https://security-tracker.debian.org/tracker/CVE-2023-6779
- https://ubuntu.com/security/notices/USN-6620-1
- https://www.cve.org/CVERecord?id=CVE-2023-6779
- https://nvd.nist.gov/vuln/detail/CVE-2023-6779
- https://ubuntu.com/security/CVE-2023-6779
Peer vulnerabilities
(Found alongside the following vulnerabilities)
- collector/bleeping-computer
- source/BleepingComputer
- alias/CVE-2023-6246
- alias/CVE-2022-39046
- alias/CVE-2023-6779
- alias/CVE-2023-6780
- alias/CVE-2023-4911
- agent/type
- agent/news-ai
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- agent/title
- agent/first-publish-date
- agent/remedy
- agent/author
- agent/severity
- agent/weakness
- agent/description
- collector/nvd-api
- source/NVD
- collector/mitre-cve
- source/MITRE
- agent/references
- collector/redhat-bugzilla
- source/Red Hat
- agent/last-modified-date
- collector/launchpad-cve
- source/Launchpad
- agent/event
- collector/nvd-cve
- agent/tags
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- vendor/gnu
- canonical/gnu c library (glibc)
- version/gnu c library (glibc)/2.37
- version/gnu c library (glibc)/2.36
- canonical/gnu glibc
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/38
- version/fedoraproject fedora/39
- package-manager/redhat
- version/gnu glibc/2.37
- package-manager/debian
- package-manager/ubuntu