Date: Tue, 29 Dec 1998 19:19:52 -0500 (EST)
From: Cristian Gafton <gafton@redhat.com>
To: redhat-watch-list@redhat.com
Subject: SECURITY: New pam packages available

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Red Hat Linux Security Update


I. Risk level: SMALL
~~~~~~~~~~~~~~~~~~~~
The default configuration as shipped with the supported releases of Red Hat
Linux is not vulnerable to this problem.


II. Description
~~~~~~~~~~~~~~~
A race condition that can be exploited under some particular scenarios has
been identified in all versions of the Linux-PAM library shipped with all
versions of Red Hat Linux. The vulnerability is exhibited in the
pam_unix_passwd.so module included in Red Hat Linux, but *not* used by
either of the 4.2 or 5.x releases. Red Hat Linux uses the pam_pwdb.so
module for performing PAM authentication.

You are at risk if you enabled pam_unix_passwd.so and are using it instead
of the pam_pwdb.so module. An exploit occurs when an user with a umask
setting of 0 is trying to change the login password.

As of this release there are no known exploits of this security problem.


III. Solution
~~~~~~~~~~~~~
All users of Red Hat Linux are encouraged to upgrade to the new package
releases immediately.  As always, these packages have been signed with the
Red Hat PGP key.


Red Hat Linux 5.0, 5.1 and 5.2:
===============================

alpha:
rpm -Uvh ftp://updates.redhat.com/5.2/alpha/pam-0.64-4.alpha.rpm

i386:
rpm -Uvh ftp://updates.redhat.com/5.2/i386/pam-0.64-4.i386.rpm

sparc:
rpm -Uvh ftp://updates.redhat.com/5.2/sparc/pam-0.64-4.sparc.rpm

Source rpm:
rpm -Uvh ftp://updates.redhat.com/5.2/SRPMS/pam-0.64-4.src.rpm

Red Hat Linux 4.2:
==================

alpha:
rpm -Uvh ftp://updates.redhat.com/4.2/alpha/pam-0.57-5.alpha.rpm

i386:
rpm -Uvh ftp://updates.redhat.com/4.2/i386/pam-0.57-5.i386.rpm

sparc:
rpm -Uvh ftp://updates.redhat.com/4.2/sparc/pam-0.57-5.sparc.rpm

Source rpm:
rpm -Uvh ftp://updates.redhat.com/4.2/SRPMS/pam-0.57-5.src.rpm


Cristian
- --
- ----------------------------------------------------------------------
Cristian Gafton   --   gafton@redhat.com   --   Red Hat Software, Inc.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 UNIX is user friendly. It's just selective about who its friends are.

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