Multiple PAM vulnerabilities in portable OpenSSH

From: Damien Miller (
Date: 09/23/03

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    Date: Tue, 23 Sep 2003 06:40:25 -0600 (MDT)

    Subject: Portable OpenSSH Security Advisory: sshpam.adv

    This document can be found at:

    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.

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