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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : pam
SUMMARY   : Local vulnerability in the pam_xauth module
DATE      : 2003-07-10 12:06:00
ID        : CLA-2003:693
RELEVANT
RELEASES  : 8

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DESCRIPTION
 PAM is the authentication system used in Linux. There are several
 authentication modules making part of this system, and pam_xauth is
 one of them. This module can be used to allow the forwarding of X
 credentials from one user to another in order to share an X display.
 It is particularly useful in applications such as "su".
 
 Andreas Beck discovered[1] a vulnerability in the use of pam_xauth by
 the su utility. If the attacker can make one user run su from an X
 session, he can steal the X credentials and execute programs in the X
 display of the user running su. The worst scenario is the one where
 an administrator, logged as root, uses "su" to an account belonging
 to an attacker.
 
 The Common Vulnerabilities and Exposures project (cve.mitre.org) has
 assigned the name CAN-2002-1160 to this issue[2].
 
 This update contains a patch that adds ACL (Access Control List)
 functionality to pam_xauth and does not forward the X credentials
 from the root user by default.


SOLUTION
 All users should upgrade.
 
 
 REFERENCES:
 1.http://marc.theaimsgroup.com/?l=bugtraq&m=104431622818954&w=2
 2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1160


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/RPMS/pam-0.75-5U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/pam-devel-0.75-5U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/pam-devel-static-0.75-5U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/pam-0.75-5U80_1cl.src.rpm


ADDITIONAL INSTRUCTIONS
 The apt tool can be used to perform RPM packages upgrades:

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions reagarding the use of apt and upgrade examples 
 can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at 
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en

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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

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Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com

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