Description
Race condition in the Pipe (IPC) close function in FreeBSD 6.3 and 6.4 allows local users to cause a denial of service (crash) or gain privileges via vectors related to kqueues, which triggers a use after free, leading to a NULL pointer dereference or memory corruption.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- FreeBSD 6.4 - 'pipeclose()'/'knlist_cleardel()' Race Condition EDB-9859 · local · Oct 8, 2009 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 1022982 vdb-entry
- FreeBSD-SA-09:13 vendor-advisory
- 58544 vdb-entry
- 20090913 Re: [Full-disclosure] FreeBSD <= 6.1 kqueue() NULL pointer dereference mailing-list
- 36375 vdb-entry