BSD systems using YP with netgroups in the password database

bsd-yp-execute-shell (8625) The risk level is classified as MediumMedium Risk

Description:

A vulnerability regarding implementation errors in OpenBSD using YP (the "Yellow Pages" network information system) with netgroups in the password database could allow some processes to gain unauthorized privileges. This vulnerability could allow processes, such as rexecd and rshd to execute the shell from another user and cause atrun to change to another user?s home directory when running 'at(1)' jobs.


Consequences:

Gain Privileges

Remedy:

Apply the latest patches for rshd, rexecd, and atrun, as listed in OpenBSD Security Advisory, March 19, 2002. See References.

References:

  • OpenBSD Security Advisory, March 19, 2002: 016: SECURITY FIX: March 19, 2002.
  • BID-4338: OpenBSD rexecd, rshd, atrun BSD Authentication Implementation Error Vulnerability
  • CVE-2002-0557: Vulnerability in OpenBSD 3.0, when using YP with netgroups in the password database, causes (1) rexec or (2) rsh to run another user's shell, or (3) atrun to change to a different user's directory, possibly due to memory allocation failures or an incorrect call to auth_approval().
  • OSVDB ID: 59557: OpenBSD YP w/ netgroups Cross-user Privilege Escalation

Platforms Affected:

  • OpenBSD OpenBSD 3.0

Reported:

Mar 19, 2002

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