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The U.S. Department of Energy
Computer Incident Advisory Capability
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__________________________________________________________
INFORMATION BULLETIN
Red Hat Updated pam_smb packages fix remote buffer overflow
[Red Hat RHSA-2003:261-07]
August 26, 2003 18:00 GMT Number N-137
[REVISED 27 Oct 2003]
______________________________________________________________________________
PROBLEM: 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.
PLATFORM: Red Hat Linux 7.2, 7.3, 8, 9
Red Hat Enterprise Linux products
DAMAGE: If not updated, an attacker can exploit the pam_smb configured
to authenticate a remotely accessible service and remotely
execute arbitrary code.
SOLUTION: Apply patches as stated in Red Hat's Notification.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. This is a buffer overflow vunlerability
ASSESSMENT: where a remote user could possibly execute arbitrary code.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-137.shtml
ORIGINAL BULLETIN: https://rhn.redhat.com/errata/RHSA-2003-261.html
ADDITIONAL LINKS: https://rhn.redhat.com/errata/RHSA-2003-262.html
______________________________________________________________________________
REVISION HISTORY:
10-27-03 - Added additional link to Red Hat Advisory RHSA2003-262-07 for information on
their patches for Red Hat Enterprise Linux products.
[***** Start Red Hat RHSA-2003:261-07 *****]
Updated pam_smb packages fix remote buffer overflow.
Advisory: RHSA-2003:261-07
Last updated on: 2003-08-26
Affected Products: Red Hat Linux 7.2
Red Hat Linux 7.3
Red Hat Linux 8.0
Red Hat Linux 9
CVEs (cve.mitre.org): CAN-2003-0686
Security Advisory
Details:
Updated pam_smb packages are now available which fix a security
vulnerability (buffer overflow).
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.
Updated packages:
Red Hat Linux 7.2
--------------------------------------------------------------------------------
SRPMS:
pam_smb-1.1.6-9.7.src.rpm
[ via FTP ] [ via HTTP ] fd60d4b954d24b50901f5d8034246619
i386:
pam_smb-1.1.6-9.7.i386.rpm
[ via FTP ] [ via HTTP ] 98f57da32415dec75f43bbe57165cc62
ia64:
pam_smb-1.1.6-9.7.ia64.rpm
[ via FTP ] [ via HTTP ] 5e0ecb7ec7e24de6efc32ad8f439d0ff
Red Hat Linux 7.3
--------------------------------------------------------------------------------
SRPMS:
pam_smb-1.1.6-9.7.src.rpm
[ via FTP ] [ via HTTP ] fd60d4b954d24b50901f5d8034246619
i386:
pam_smb-1.1.6-9.7.i386.rpm
[ via FTP ] [ via HTTP ] 98f57da32415dec75f43bbe57165cc62
Red Hat Linux 8.0
--------------------------------------------------------------------------------
SRPMS:
pam_smb-1.1.6-9.8.src.rpm
[ via FTP ] [ via HTTP ] 2e399b4016dac855bc3e01056c23a244
i386:
pam_smb-1.1.6-9.8.i386.rpm
[ via FTP ] [ via HTTP ] 8cb3feb19dd74abfb582546235ee9718
Red Hat Linux 9
--------------------------------------------------------------------------------
SRPMS:
pam_smb-1.1.6-9.9.src.rpm
[ via FTP ] [ via HTTP ] 5e31c7774d44716e4bc14f5d11eb54db
i386:
pam_smb-1.1.6-9.9.i386.rpm
[ via FTP ] [ via HTTP ] 11b99a275c316e57a3fdb68ab63c90f4
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.
References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0686
------------------------------------------------------------------------------
The listed packages are GPG signed by Red Hat, Inc. for security. Our key is
available at:
http://www.redhat.com/solutions/security/news/publickey/#key
You can verify each package and see who signed it 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
The Red Hat security contact is security@redhat.com. More contact details at
http://www.redhat.com/solutions/security/news/contact.html
[***** End Red Hat RHSA-2003:261-07 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Red Hat for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
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FAX: +1 925-423-8002
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E-mail: ciac@ciac.org
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available from the CIAC Computer Security Archive.
World Wide Web: http://www.ciac.org/
Anonymous FTP: ftp.ciac.org
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
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This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
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