Description
The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.
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
- OpenBSD 2.x/3.0 - User Mode Return Value Denial of Service EDB-21167 · dos · Dec 3, 2001 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- openbsd-retval-null-dos(7690) vdb-entry
- 20011202 OpenBSD local DoS mailing-list
- [OpenBSD] 20011202 Code that crashes kernel at will + proposed patch mailing-list