OpenBSD ibcs2_exec.c and exec_elf.c denial of service

openbsd-ibcs2exe-execelf-dos (13614) The risk level is classified as MediumMedium Risk

Description:

OpenBSD is vulnerable to a denial of service, caused by a vulnerability in the ibcs2_exec.c and exec_elf.c files. By creating a malformed binary containing an invalid header, a local attacker could cause a kernel panic, once the binary is executed.


Consequences:

Denial of Service

Remedy:

For OpenBSD 2.8:
No remedy available as of November 2003. OpenBSD has not indicated whether a patch will be available for this version.

For OpenBSD 3.3:
Apply the patch for this vulnerability (010: RELIABILITY FIX: November 4, 2003), available from the OpenBSD 3.3 errata Web page. See References.

For OpenBSD 3.4:
Apply the patch for this vulnerability (005: RELIABILITY FIX: November 4, 2003), available from the OpenBSD 3.4 errata Web page. See References.

References:

  • Georgi Guninski Security Advisory #63, 2003: OpenBSD kernel panic, yet still *BSD much better than windows.
  • OpenBSD 3.3 errata Web page: 010: RELIABILITY FIX: November 4, 2003.
  • OpenBSD 3.4 errata Web page: 005: RELIABILITY FIX: November 4, 2003.
  • BID-8978: OpenBSD Local Malformed Binary Execution Denial of Service Vulnerability
  • CVE-2003-0955: 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.
  • OSVDB ID: 2832: OpenBSD compat_ibcs2 Overflow

Platforms Affected:

  • OpenBSD OpenBSD 2.8
  • OpenBSD OpenBSD 3.3

Reported:

Nov 04, 2003

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