OpenBSD sshd authentication error on systems using YP with netgroups could allow unauthorized access

bsd-sshd-authentication-error (9215) The risk level is classified as MediumMedium Risk

Description:

OpenBSD and possibly other BSD implementations using OpenSSH could allow a remote attacker to authenticate using another user's password. On systems using YP with netgroups in the password database, sshd could use the password for a different user after performing an ACL check for the requested username. This could allow a denied user to authenticate using another user's password, which could result in legitimate user's being denied access to the system.


Consequences:

Bypass Security

Remedy:

For OpenBSD 3.1:
Apply the patch for this vulnerability, as listed in as listed in OpenBSD SECURITY FIX - 004, May 22 2002. See References.

— OR —

Upgrade to the latest version of OpenSSH (3.2.3 or later), available from the OpenSSH Web site. See References.

References:

Platforms Affected:

  • OpenBSD OpenBSD 3.1
  • OpenBSD OpenSSH 3.2.2

Reported:

May 22, 2002

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