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CVE-2023-4911: GNU C Library Buffer Overflow Vulnerability

criticalknown exploitedpublic exploitCVE-2023-4911
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
GNU C Library's dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges.

CSIRTS triage

vendor: GNUproduct: C LibraryPrivilege escalation
What
A buffer overflow vulnerability allows a local attacker to execute code with elevated privileges.
Who is affected
Users of GNU C Library's dynamic loader ld.so are affected.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
Action
Update to the patched version of the GNU C Library.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-11-21
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-4911

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-4911coverage & exploitation statusNVD · CVE.org

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