CVE-2026-67607— hfiref0x LightFTP 竞争条件问题漏洞

LightFTP 2.3.1 Race Condition DoS via worker_thread_cleanup

LightFTP 2.3.1 contains a residual race condition vulnerability (an incomplete fix for CVE-2024-11144) in the worker_thread_cleanup() function of ftpserv.c that allows remote unauthenticated attackers to destabilize or crash the daemon by triggering unsynchronized access to shared per-connection state without holding the required mutex lock. Attackers can send a data-transfer command such as LIST followed immediately by ABOR to exploit the missing synchronization on shared context and detached thread id reuse, resulting in daemon destabilization or crash which can lead to a denial of service. The 2.3.1 patch only narrowed the timing window (an extra re-check and reordered cleanup), it never added the missing lock, so the underlying race remains.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

检查时间与使用时间(TOCTOU)的竞争条件

hfiref0x LightFTP 竞争条件问题漏洞

hfiref0x LightFTP是hfiref0x个人开发者开源的一个轻量级FTP服务。 hfiref0x LightFTP 2.3.1版本存在竞争条件问题漏洞，该漏洞源于竞争条件问题，远程攻击者可通过重用FTP上下文的连接与正在进行的ABRT清理竞争，利用worker_thread_cleanup()和pthread_join()之间在MTLock外未受保护的WorkerThreadId重新检查，导致pthread_join()对无效线程ID操作，造成服务器崩溃。

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