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Multiple PAM vulnerabilities in portable OpenSSH

 

 

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djm at cvs

Sep 23, 2003, 4:40 AM

Post #1 of 2 (3863 views)
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Multiple PAM vulnerabilities in portable OpenSSH

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 support.


djm at cvs

Sep 23, 2003, 4:40 AM

Post #2 of 2 (3564 views)
Permalink
Multiple PAM vulnerabilities in portable OpenSSH [In reply to]

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 support.

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