Description
Race condition in the HFS vfs sysctl interface in XNU 1228.8.20 and earlier on Apple Mac OS X 10.5.6 and earlier allows local users to cause a denial of service (kernel memory corruption) by simultaneously executing the same HFS_SET_PKG_EXTENSIONS code path in multiple threads, which is problematic because of lack of mutex locking for an unspecified global variable.
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
- Apple Mac OSX xnu 1228.x - 'vfssysctl' Local Kernel Denial of Service (PoC) EDB-8265 · dos · Mar 23, 2009 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 8265 exploit
- 34202 vdb-entry
- 34424 third-party-advisory
- http://www.digit-labs.org/files/exploits/xnu-vfssysctl-dos.c
- http://www.informationweek.com/news/hardware/mac/showArticle.jhtml?articleID=216401181