TUCoPS :: Linux :: Red Hat/Fedora :: m-084.txt

Red Hat pam ldap Vulnerability (CIAC M-084)


                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
                           ___  __ __    _     ___
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                             INFORMATION BULLETIN

                        Red Hat "pam_ldap" Vulnerability
                  [Red Hat Security Advisory RHSA-2002:084-17]

May 28, 2002 23:00 GMT                                            Number M-084
[Revised 5 June 2002]
PROBLEM:       Versions of pam_ldap prior to version 144 include a format 
               string vulnerability in the logging function. 
PLATFORM:      Updated nns_ldap packages are now available for Red Hat Linux 
               6.2, 7.0, 7.1, 7.2, and 7.3. These packages fix a string format 
               vulnerability in the pam_ldap module. 
DAMAGE:        If exploited, it may be possible for an attacker to potentially 
               write to arbitrary locations in process memory and execute 
SOLUTION:      Update your nss_ldap package per vendors instructions. 
VULNERABILITY  The risk is MEDIUM. Currently, no activity has been reported 
ASSESSMENT:    targeting this vulnerability. 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/m-084.shtml 
 ORIGINAL BULLETIN:  http://rhn.redhat.com/errata/RHSA-2002-084.html
       - 5 June, 2002 - Red Hat Linux v6.2 Replacement Patches available

[***** Start Red Hat Security Advisory RHSA-2002:084-17 *****]

                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated nss_ldap packages fix pam_ldap vulnerability
Advisory ID:       RHSA-2002:084-17
Issue date:        2002-05-07
Updated on:        2002-05-26
Product:           Red Hat Linux
Keywords:          pam_ldap format string syslog security
Cross references:  
Obsoletes:         RHSA-2000:024
CVE Names:         CAN-2002-0374

1. Topic:

Updated nss_ldap packages are now available for Red Hat Linux 6.2, 7.0,
7.1,7.2, and 7.3. These packages fix a string format vulnerability in the
pam_ldap module.

2. Relevant releases/architectures:

Red Hat Linux 6.2 - alpha, i386, sparc

Red Hat Linux 7.0 - alpha, i386

Red Hat Linux 7.1 - alpha, i386, ia64

Red Hat Linux 7.2 - i386, ia64

Red Hat Linux 7.3 - i386

3. Problem description:

The pam_ldap module provides authentication for user access to a system by
consulting a directory using LDAP. Versions of pam_ldap prior to version
144 include a format string bug in the logging function. The packages
included in this erratum update pam_ldap to version 144, fixing this bug.

The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0374 to this issue.

Due to differences in the default behavior of the pam_ldap module when
performing account management, the version of authconfig included in Red
Hat Linux 7.2 will generate incorrect /etc/pam.d/system-auth files for this
version of pam_ldap.  This update includes an updated version of
authconfig for Red Hat Linux 7.2 which addresses this problem (versions of
authconfig included with Red Hat Linux 7, 7.1, and 7.3 are not affected).

Our thanks go to the pam_ldap team at padl.com for bringing this to our

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. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

6. RPMs required:

Red Hat Linux 6.2:





Red Hat Linux 7.0:




Red Hat Linux 7.1:





Red Hat Linux 7.2:




Red Hat Linux 7.3:



7. Verification:

MD5 sum                          Package Name
02160b0b00ebc1f1c7966e3568eaf7f6 6.2/en/os/SRPMS/nss_ldap-189-1.6.2.src.rpm
b2e869b6aabbd2c2cc64133f684f64bc 6.2/en/os/alpha/nss_ldap-189-1.6.2.alpha.rpm
8276550d54abfcaccb1e3aa1b6198ffd 6.2/en/os/i386/nss_ldap-189-1.6.2.i386.rpm
614b76ab7c51ebcc3390651af5c9de80 6.2/en/os/sparc/nss_ldap-189-1.6.2.sparc.rpm
1eb57f3965d1c68d7891c8a858573ae1 7.0/en/os/SRPMS/nss_ldap-189-1.7.src.rpm
6f3838a447d9766b782886695df52149 7.0/en/os/alpha/nss_ldap-189-1.7.alpha.rpm
8484f482a1a6816a0c5e1dade2d7fd33 7.0/en/os/i386/nss_ldap-189-1.7.i386.rpm
1eb57f3965d1c68d7891c8a858573ae1 7.1/en/os/SRPMS/nss_ldap-189-1.7.src.rpm
6f3838a447d9766b782886695df52149 7.1/en/os/alpha/nss_ldap-189-1.7.alpha.rpm
8484f482a1a6816a0c5e1dade2d7fd33 7.1/en/os/i386/nss_ldap-189-1.7.i386.rpm
5805176343cfd2b7e033ce8cf8d0706d 7.1/en/os/ia64/nss_ldap-189-1.7.ia64.rpm
7216e533cd6cab1ff4fb46171a585b43 7.2/en/os/SRPMS/authconfig-
d977011dc7bbc3eea5b3e01ce7d364d9 7.2/en/os/SRPMS/nss_ldap-189-2.src.rpm
7282baea30503699772dd3e2aa866a11 7.2/en/os/i386/authconfig-
d2b2402e6c59f886556872d6b2bc2f16 7.2/en/os/i386/nss_ldap-189-2.i386.rpm
0c451e5cb1cb7e5a5d7152aa91ee3834 7.2/en/os/ia64/authconfig-
7d07126091032adfdae1d2192b9ca264 7.2/en/os/ia64/nss_ldap-189-2.ia64.rpm
d977011dc7bbc3eea5b3e01ce7d364d9 7.3/en/os/SRPMS/nss_ldap-189-2.src.rpm
d2b2402e6c59f886556872d6b2bc2f16 7.3/en/os/i386/nss_ldap-189-2.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:

You can verify each package with the following command:
    rpm --checksig  <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:
    rpm --checksig --nogpg <filename>

8. References:


Copyright(c) 2000, 2001, 2002 Red Hat, Inc.

[***** End Red Hat Security Advisory RHSA-2002:084-17 *****]


CIAC wishes to acknowledge the contributions of Red Hat, Inc. 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
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