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===========================================================================
             AUSCERT External Security Bulletin Redistribution
                             
                   ESB-1999.001 -- Red Hat Linux Bulletin
                    SECURITY: new pam packages available
                              04 January 1999

===========================================================================

Red Hat Software, Inc. has released the following advisory concerning a
vulnerability in all versions of the Linux-PAM library shipped with Red
Hat Linux. This vulnerability is not enabled by default on either Red Hat
Linux 4.2 or 5.x releases.

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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
- - --
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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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This security bulletin is provided as a service to AusCERT's members.  As
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