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Advisories

LightFTP 2.3.1 Race Condition DoS via worker_thread_cleanup

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severity
high
date
Affecting

  • LightFTP <= 2.3.1

CWE
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CVSS
8.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Gjoko Krstic of Zero Science Lab
Description
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.

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