[Full-disclosure] [FLSA-2005:152771] Updated pam packages fix security issue

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Date: Wed, 18 May 2005 16:49:20 -0400
To: bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk

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               Fedora Legacy Update Advisory

Synopsis: Updated pam packages fix security issue
Advisory ID: FLSA:152771
Issue date: 2005-05-18
Product: Red Hat Linux
Keywords: Bugfix
CVE Names: CAN-2003-0388
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1. Topic:

Updated pam packages that fix a security vulnerability are now
available.

PAM (Pluggable Authentication Modules) is a system security tool that
allows system administrators to set an authentication policy without
having to recompile programs that handle authentication.

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386
Red Hat Linux 9 - i386

3. Problem description:

These updates fix a potential security problem present in the pam_wheel
module. These updates correct a bug in the pam_lastlog module which
prevented it from properly manipulating the /var/log/lastlog entry for
users with very high user IDs.

The pam_wheel module is used to restrict access to a particular service
based on group membership. If the pam_wheel module was used with the
"trust" option enabled, but without the "use_uid" option, any local user
would be able to spoof the username returned by getlogin(). The user
could therefore gain access to a superuser account without supplying a
password. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2003-0388 to this issue.

When manipulating the entry in /var/log/lastlog, which corresponds to a
given user, the pam_lastlog module calculates the location of the entry
by multiplying the UID and the length of an entry in the file. On some
systems, the result of this calculation would mistakenly be truncated to
32 bits for users with sufficiently high UIDs.

All users of pam should upgrade to these updated packages, which resolve
these issues.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which
are not installed but included in the list will not be updated. Note
that you can also use wildcards (*.rpm) if your current directory *only*
contains the desired RPMs.

Please note that this update is also available via yum and apt. Many
people find this an easier way to apply updates. To use yum issue:

yum update

or to use apt:

apt-get update; apt-get upgrade

This will start an interactive process that will result in the
appropriate RPMs being upgraded on your system. This assumes that you
have yum or apt-get configured for obtaining Fedora Legacy content.
Please visit http://www.fedoralegacy.org/docs for directions on how to
configure yum and apt-get.

5. Bug IDs fixed:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=152771

6. RPMs required:

Red Hat Linux 7.3:
SRPM:
http://download.fedoralegacy.org/redhat/7.3/updates/SRPMS/pam-0.75-46.10.legacy.7x.src.rpm

i386:
http://download.fedoralegacy.org/redhat/7.3/updates/i386/pam-0.75-46.10.legacy.7x.i386.rpm
http://download.fedoralegacy.org/redhat/7.3/updates/i386/pam-devel-0.75-46.10.legacy.7x.i386.rpm

Red Hat Linux 9:

SRPM:
http://download.fedoralegacy.org/redhat/9/updates/SRPMS/pam-0.75-62.10.legacy.src.rpm

i386:
http://download.fedoralegacy.org/redhat/9/updates/i386/pam-0.75-62.10.legacy.i386.rpm
http://download.fedoralegacy.org/redhat/9/updates/i386/pam-devel-0.75-62.10.legacy.i386.rpm

7. Verification:

SHA1 sum Package Name
---------------------------------------------------------------------

bb7b9e1c63be2eb2064b46eacaf8d0ce68594d11
redhat/7.3/updates/i386/pam-0.75-46.10.legacy.7x.i386.rpm
9af62c26654ba14bde7bf6e3b59b9b4f62fd5d35
redhat/7.3/updates/i386/pam-devel-0.75-46.10.legacy.7x.i386.rpm
8f06c0d3a0cb5938206c4d2d20484f325ebcca42
redhat/7.3/updates/SRPMS/pam-0.75-46.10.legacy.7x.src.rpm
622eac1455b5ccb0cf75705cc0f42b3226f9cc31
redhat/9/updates/i386/pam-0.75-62.10.legacy.i386.rpm
18c330ff1ef063f21a3b3c8eb297d09bb004ee67
redhat/9/updates/i386/pam-devel-0.75-62.10.legacy.i386.rpm
8c10c919199f35e5ef785b57f35a8d300d3ea01e
redhat/9/updates/SRPMS/pam-0.75-62.10.legacy.src.rpm

These packages are GPG signed by Fedora Legacy for security. Our key is
available from http://www.fedoralegacy.org/about/security.php

You can verify each package with the following command:

    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the sha1sum with the following command:

    sha1sum <filename>

8. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0388

9. Contact:

The Fedora Legacy security contact is <secnotice@fedoralegacy.org>. More
project details at http://www.fedoralegacy.org

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