Red Hat Linux Advisory: pam_smb

Red Hat Security Advisory

1. Topic:

Updated pam_smb packages are now available which fix a security
vulnerability (buffer overflow).

2. Relevant releases/architectures:

Red Hat Linux 7.2 – i386, ia64
Red Hat Linux 7.3 – i386
Red Hat Linux 8.0 – i386
Red Hat Linux 9 – i386

3. Problem description:

The pam_smb module is a pluggable authentication module (PAM)
used to authenticate users using an external Server Message Block
(SMB) server.

A buffer overflow vulnerability has been found that affects
unpatched versions of pam_smb up to and including 1.1.6.

On systems that use pam_smb and are configured to authenticate a
remotely accessible service, an attacker can exploit this bug and
remotely execute arbitrary code. The Common Vulnerabilities and
Exposures project (cve.mitre.org/) has assigned the name
CAN-2003-0686 to this issue.

Red Hat Linux versions 7.2, 7.3, 8.0, and 9 ship with versions
of pam_smb that are vulnerable to this issue, however pam_smb is
not enabled by default.

Users of pam_smb are advised to upgrade to these erratum
packages, which contain a patch to version 1.1.6 to correct this
issue.

Red Hat would like to thank Dave Airlie of the Samba team for
notifying us of this issue.

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 Red Hat
Network. Many people find this an easier way to apply updates. To
use Red Hat Network, launch the Red Hat Update Agent with the
following command:

up2date

This will start an interactive process that will result in the
appropriate RPMs being upgraded on your system.

5. RPMs required:

Red Hat Linux 7.2:

SRPMS:

ftp://updates.redhat.com/7.2/en/os/SRPMS/pam_smb-1.1.6-9.7.src.rpm

i386:

ftp://updates.redhat.com/7.2/en/os/i386/pam_smb-1.1.6-9.7.i386.rpm

ia64:

ftp://updates.redhat.com/7.2/en/os/ia64/pam_smb-1.1.6-9.7.ia64.rpm

Red Hat Linux 7.3:

SRPMS:

ftp://updates.redhat.com/7.3/en/os/SRPMS/pam_smb-1.1.6-9.7.src.rpm

i386:

ftp://updates.redhat.com/7.3/en/os/i386/pam_smb-1.1.6-9.7.i386.rpm

Red Hat Linux 8.0:

SRPMS:

ftp://updates.redhat.com/8.0/en/os/SRPMS/pam_smb-1.1.6-9.8.src.rpm

i386:

ftp://updates.redhat.com/8.0/en/os/i386/pam_smb-1.1.6-9.8.i386.rpm

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/pam_smb-1.1.6-9.9.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/pam_smb-1.1.6-9.9.i386.rpm

6. Verification:

MD5 sum Package Name

fd60d4b954d24b50901f5d8034246619
7.2/en/os/SRPMS/pam_smb-1.1.6-9.7.src.rpm
98f57da32415dec75f43bbe57165cc62
7.2/en/os/i386/pam_smb-1.1.6-9.7.i386.rpm
5e0ecb7ec7e24de6efc32ad8f439d0ff
7.2/en/os/ia64/pam_smb-1.1.6-9.7.ia64.rpm
fd60d4b954d24b50901f5d8034246619
7.3/en/os/SRPMS/pam_smb-1.1.6-9.7.src.rpm
98f57da32415dec75f43bbe57165cc62
7.3/en/os/i386/pam_smb-1.1.6-9.7.i386.rpm
2e399b4016dac855bc3e01056c23a244
8.0/en/os/SRPMS/pam_smb-1.1.6-9.8.src.rpm
8cb3feb19dd74abfb582546235ee9718
8.0/en/os/i386/pam_smb-1.1.6-9.8.i386.rpm
5e31c7774d44716e4bc14f5d11eb54db
9/en/os/SRPMS/pam_smb-1.1.6-9.9.src.rpm
11b99a275c316e57a3fdb68ab63c90f4
9/en/os/i386/pam_smb-1.1.6-9.9.i386.rpm

These packages are GPG signed by Red Hat for security. Our key
is available from https://www.redhat.com/security/keys.html

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 md5sum with the
following command:

md5sum <filename>

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0686

8. Contact:

The Red Hat security contact is <[email protected]>. More
contact details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.