Buffer overflow in GNU Glibc
CVE-2023-6779
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.032 (87.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000
Affected products
- GNU Glibc
- Fedora
- Fedoraproject Fedora — versions 38, 39
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Glibc — versions 2.39
Weakness classification (CWE)
Public proof-of-concept exploits
References
- packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.ht… (Exploit, VDB Entry, Third Party Advisory)
- seclists.org/fulldisclosure/2024/Feb/3 (Exploit, Mailing List, Third Party Advisory)
- access.redhat.com/security/cve/CVE-2023-6779 (Third Party Advisory, vdb-entry)
- RHBZ#2254395 (issue-tracking, Issue Tracking)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- security.gentoo.org/glsa/202402-01 (Third Party Advisory)
- www.openwall.com/lists/oss-security/2024/01/30/6 (Exploit, Mailing List)
- www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt (Third Party Advisory)
- security.netapp.com/advisory/ntap-20240223-0006/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-6779?
- CVE-2023-6779 is a high-severity vulnerability in GNU Glibc, classified under Heap-based Buffer Overflow. CVSS score: 8.2/10. Published 2024-01-31.
- How severe is CVE-2023-6779?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2023-6779 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.