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RedHat: pam_smb remote buffer overflow vulnerability Print E-mail
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Posted by Team   
RedHat Linux On systems that use pam_smb and are configured to authenticate aremotely accessible service, an attacker can exploit this bug andremotely execute arbitrary code.

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Updated pam_smb packages fix remote buffer overflow.
Advisory ID:       RHSA-2003:261-01
Issue date:        2003-08-26
Updated on:        2003-08-26
Product:           Red Hat Linux
Cross references:  
CVE Names:         CAN-2003-0686
- ---------------------------------------------------------------------

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 ( 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:


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:




Red Hat Linux 7.3:



Red Hat Linux 8.0:



Red Hat Linux 9:



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.Red

You can verify each package with the following command:
    rpm --checksig -v 

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:

7. References:

8. Contact:

The Red Hat security contact is <secalert@Red>.  More contact
details at https://www.Red

Copyright 2003 Red Hat, Inc.

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