OpenSSH: multiple vulnerabilities in the new PAM code

[Michael Sierchio]

This affects only 3.7p1 and 3.7.1p1.  The advice to leave
PAM disabled is far from heartening, nor is the semi-lame
blaming the PAM spec for implementation bugs.

I happen to like OPIE for remote access.



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
         vulnerable.

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