CVE-2023-4911
Published: November 21, 2023
Official Description
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.
CISA KEV Advisory
GNU C Library Buffer Overflow Vulnerability
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.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Risk Analysis
This high-severity vulnerability in GNU C Library's dynamic loader ld.so is a buffer overflow when processing the GLIBC_TUNABLES environment variable. A local attacker can exploit this to execute code with elevated privileges. The high EPSS score and inclusion in CISA's KEV confirm active exploitation and a high likelihood of further attacks.
This vulnerability is actively being exploited in the wild. Exploitation requires local access to the system to achieve privilege escalation.
System administrators should apply the latest GNU C Library updates to patch this vulnerability. Ensure that systems are regularly patched to prevent local privilege escalation attacks.
Technical Analysis
CVE-2023-4911 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2023-4911 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-4911 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1