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AUSCERT External Security Bulletin Redistribution
ESB-2010.1051
Moderate: pam security update
17 November 2010
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: pam
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Red Hat Enterprise Linux WS/Desktop 6
Impact/Access: Increased Privileges -- Existing Account
Access Privileged Data -- Existing Account
Read-only Data Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2010-3853 CVE-2010-3435 CVE-2010-3316
Reference: ESB-2010.0996
Original Bulletin:
https://rhn.redhat.com/errata/RHSA-2010-0891.html
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Red Hat Security Advisory
Synopsis: Moderate: pam security update
Advisory ID: RHSA-2010:0891-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2010-0891.html
Issue date: 2010-11-16
CVE Names: CVE-2010-3316 CVE-2010-3435 CVE-2010-3853
=====================================================================
1. Summary:
Updated pam packages that fix three security issues are now available for
Red Hat Enterprise Linux 6.
The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
3. Description:
Pluggable Authentication Modules (PAM) provide a system whereby
administrators can set up authentication policies without having to
recompile programs that handle authentication.
It was discovered that the pam_namespace module executed the external
script namespace.init with an unchanged environment inherited from an
application calling PAM. In cases where such an environment was untrusted
(for example, when pam_namespace was configured for setuid applications
such as su or sudo), a local, unprivileged user could possibly use this
flaw to escalate their privileges. (CVE-2010-3853)
It was discovered that the pam_env and pam_mail modules used root
privileges while accessing user's files. A local, unprivileged user could
use this flaw to obtain information, from the lines that have the KEY=VALUE
format expected by pam_env, from an arbitrary file. Also, in certain
configurations, a local, unprivileged user using a service for which the
pam_mail module was configured for, could use this flaw to obtain limited
information about files or directories that they do not have access to.
(CVE-2010-3435)
Note: As part of the fix for CVE-2010-3435, this update changes the default
value of pam_env's configuration option user_readenv to 0, causing the
module to not read user's ~/.pam_environment configuration file by default,
as reading it may introduce unexpected changes to the environment of the
service using PAM, or PAM modules consulted after pam_env.
It was discovered that the pam_xauth module did not verify the return
values of the setuid() and setgid() system calls. A local, unprivileged
user could use this flaw to execute the xauth command with root privileges
and make it read an arbitrary input file. (CVE-2010-3316)
Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for
reporting the CVE-2010-3435 issue.
All pam users should upgrade to these updated packages, which contain
backported patches to correct these issues.
4. Solution:
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259
5. Bugs fixed (http://bugzilla.redhat.com/):
637898 - CVE-2010-3316 pam: pam_xauth missing return value checks from setuid() and similar calls
641335 - CVE-2010-3435 pam: pam_env and pam_mail accessing users' file with root privileges
643043 - CVE-2010-3853 pam: pam_namespace executes namespace.init with service's environment
6. Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm
i386:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
x86_64:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-1.1.1-4.el6_0.1.x86_64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm
i386:
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
x86_64:
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm
x86_64:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-1.1.1-4.el6_0.1.x86_64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm
x86_64:
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm
i386:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
ppc64:
pam-1.1.1-4.el6_0.1.ppc.rpm
pam-1.1.1-4.el6_0.1.ppc64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.ppc.rpm
pam-debuginfo-1.1.1-4.el6_0.1.ppc64.rpm
pam-devel-1.1.1-4.el6_0.1.ppc.rpm
pam-devel-1.1.1-4.el6_0.1.ppc64.rpm
s390x:
pam-1.1.1-4.el6_0.1.s390.rpm
pam-1.1.1-4.el6_0.1.s390x.rpm
pam-debuginfo-1.1.1-4.el6_0.1.s390.rpm
pam-debuginfo-1.1.1-4.el6_0.1.s390x.rpm
pam-devel-1.1.1-4.el6_0.1.s390.rpm
pam-devel-1.1.1-4.el6_0.1.s390x.rpm
x86_64:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-1.1.1-4.el6_0.1.x86_64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/pam-1.1.1-4.el6_0.1.src.rpm
i386:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
x86_64:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-1.1.1-4.el6_0.1.x86_64.rpm
pam-debuginfo-1.1.1-4.el6_0.1.i686.rpm
pam-debuginfo-1.1.1-4.el6_0.1.x86_64.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package
7. References:
https://www.redhat.com/security/data/cve/CVE-2010-3316.html
https://www.redhat.com/security/data/cve/CVE-2010-3435.html
https://www.redhat.com/security/data/cve/CVE-2010-3853.html
http://www.redhat.com/security/updates/classification/#moderate
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://www.redhat.com/security/team/contact/
Copyright 2010 Red Hat, Inc.
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