CVE-2026-67607

Summary

LightFTP 2.3.1 contains a race condition vulnerability that allows remote attackers to crash the server by racing a fresh connection that reuses the FTP context against an in-progress ABRT cleanup. Attackers can exploit the unprotected re-check of WorkerThreadId between worker_thread_cleanup() and pthread_join() outside of MTLock to cause pthread_join() to operate on an invalid thread ID, resulting in a server crash. CVE-2024-11144 identifies an incomplete fix of this vulnerability.

Affected Software

Weaknesses

• CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/zeroscience/tuktam#real-world-case-study-lightftp-cve-2024-11144

References

• https://github.com/zeroscience/tuktam#real-world-case-study-lightftp-cve-2024-11144
• https://www.vulncheck.com/advisories/lightftp-race-condition-dos-via-worker-thread-cleanup

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