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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
code.
SOLUTION: Update your nss_ldap package per vendors instructions.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. Currently, no activity has been reported
ASSESSMENT: targeting this vulnerability.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/m-084.shtml
ORIGINAL BULLETIN: http://rhn.redhat.com/errata/RHSA-2002-084.html
PATCHES:
- 5 June, 2002 - Red Hat Linux v6.2 Replacement Patches available
SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/nss_ldap-189-1.6.2.1.src.rpm
alpha:
ftp://updates.redhat.com/6.2/en/os/alpha/nss_ldap-189-1.6.2.1.alpha.rpm
i386:
ftp://updates.redhat.com/6.2/en/os/i386/nss_ldap-189-1.6.2.1.i386.rpm
sparc:
ftp://updates.redhat.com/6.2/en/os/sparc/nss_ldap-189-1.6.2.1.sparc.rpm
______________________________________________________________________________
[***** 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
attention.
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. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
6. RPMs required:
Red Hat Linux 6.2:
SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/nss_ldap-189-1.6.2.1.src.rpm
alpha:
ftp://updates.redhat.com/6.2/en/os/alpha/nss_ldap-189-1.6.2.1.alpha.rpm
i386:
ftp://updates.redhat.com/6.2/en/os/i386/nss_ldap-189-1.6.2.1.i386.rpm
sparc:
ftp://updates.redhat.com/6.2/en/os/sparc/nss_ldap-189-1.6.2.1.sparc.rpm
Red Hat Linux 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/nss_ldap-189-1.7.src.rpm
alpha:
ftp://updates.redhat.com/7.0/en/os/alpha/nss_ldap-189-1.7.alpha.rpm
i386:
ftp://updates.redhat.com/7.0/en/os/i386/nss_ldap-189-1.7.i386.rpm
Red Hat Linux 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/nss_ldap-189-1.7.src.rpm
alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/nss_ldap-189-1.7.alpha.rpm
i386:
ftp://updates.redhat.com/7.1/en/os/i386/nss_ldap-189-1.7.i386.rpm
ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/nss_ldap-189-1.7.ia64.rpm
Red Hat Linux 7.2:
SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/nss_ldap-189-2.src.rpm
ftp://updates.redhat.com/7.2/en/os/SRPMS/authconfig-4.1.19.2-1.src.rpm
i386:
ftp://updates.redhat.com/7.2/en/os/i386/nss_ldap-189-2.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/authconfig-4.1.19.2-1.i386.rpm
ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/nss_ldap-189-2.ia64.rpm
ftp://updates.redhat.com/7.2/en/os/ia64/authconfig-4.1.19.2-1.ia64.rpm
Red Hat Linux 7.3:
SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/nss_ldap-189-2.src.rpm
i386:
ftp://updates.redhat.com/7.3/en/os/i386/nss_ldap-189-2.i386.rpm
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-4.1.19.2-1.src.rpm
d977011dc7bbc3eea5b3e01ce7d364d9 7.2/en/os/SRPMS/nss_ldap-189-2.src.rpm
7282baea30503699772dd3e2aa866a11 7.2/en/os/i386/authconfig-4.1.19.2-1.i386.rpm
d2b2402e6c59f886556872d6b2bc2f16 7.2/en/os/i386/nss_ldap-189-2.i386.rpm
0c451e5cb1cb7e5a5d7152aa91ee3834 7.2/en/os/ia64/authconfig-4.1.19.2-1.ia64.rpm
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:
http://www.redhat.com/about/contact/pgpkey.html
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:
http://www.padl.com/OSS/pam_ldap.html
http://archives.neohapsis.com/archives/vulnwatch/2002-q2/0053.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0374
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
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