Looney Tunables (CVE-2023-4911) exploited for privilege escalation
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Goal
Detect exploitation of CVE-2023-4911, a buffer overflow in GNU C.
Strategy
This vulnerability exists in GNU C Library’s dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. A local attacker could launch a SUID binary with a maliciously crafted GLIBC_TUNABLES value to execute code with elevated permissions. This detection monitors SUID binary executions and alerts when the GLIBC_TUNABLES environment variable is provided.
Triage and response
- Inspect the executing process and the
@process.envs field to determine if this is expected activity. - Review the process tree and related signals to establish a timeline and determine where the activity originated from.
- Follow your organization’s internal processes for investigating and remediating compromised systems.
- Find and repair the root cause of the exploit.
Requires Agent version 7.27 or later.
