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Multiple PAM vulnerabilities in portable OpenSSH

From: Damien Miller (djmcvs.openbsd.org)
Date: Tue Sep 23 2003 - 07:40:25 CDT

Subject: Portable OpenSSH Security Advisory: sshpam.adv

This document can be found at: http://www.openssh.com/txt/sshpam.adv

1. Versions affected:

        Portable OpenSSH versions 3.7p1 and 3.7.1p1 contain multiple
        vulnerabilities in the new PAM code. At least one of these bugs
        is remotely exploitable (under a non-standard configuration,
        with privsep disabled).

        The OpenBSD releases of OpenSSH do not contain this code and
        are not vulnerable. Older versions of portable OpenSSH are not

2. Solution:

        Upgrade to Portable OpenSSH 3.7.1p2 or disable PAM
        support ("UsePam no" in sshd_config).

        Due to complexity, inconsistencies in the specification and
        differences between vendors' PAM implementations we recommend
        that PAM be left disabled in sshd_config unless there is a need
        for its use. Sites only using public key or simple password
        authentication usually have little need to enable PAM support.