Description
OpenBSD kernel 3.3 and 3.4 allows local users to cause a denial of service (kernel panic) and possibly execute arbitrary code in 3.4 via a program with an invalid header that is not properly handled by (1) ibcs2_exec.c in the iBCS2 emulation (compat_ibcs2) or (2) exec_elf.c, which leads to a stack-based buffer overflow.
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 2
- OpenBSD 2.x < 3.3 - 'exec_ibcs2_coff_prep_zmagic()' kernel stack overflow EDB-125 · local · Nov 19, 2003 · verified
- OpenBSD - 'ibcs2_exec' Kernel Code Execution EDB-118 · local · Nov 7, 2003 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 20031104 010: RELIABILITY FIX: November 4, 2003 vendor-advisory
- http://marc.info/?l=openbsd-security-announce&m=106917441524978&w=2
- 8978 vdb-entry
- http://marc.info/?l=openbsd-security-announce&m=106808820119679&w=2
- 20031104 OpenBSD kernel overflow, yet still *BSD much better than windows mailing-list
- http://www.guninski.com/msuxobsd2.html