80167 2002-10-05 19:55 /199 rader/ <bugzilla@redhat.com>
Importerad: 2002-10-05 19:55 av Brevbäraren
Extern mottagare: redhat-watch-list@redhat.com
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Mottagare: Bugtraq (import) <1808>
Ärende: [RHSA-2002:175-16] Updated nss_ldap packages fix buffer overflow
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Red Hat, Inc. Red Hat Security Advisory
Synopsis: Updated nss_ldap packages fix buffer overflow
Advisory ID: RHSA-2002:175-16
Issue date: 2002-08-12
Updated on: 2002-10-03
Product: Red Hat Linux
Keywords: nss_ldap dns automatic configuration MAXPACKET
Cross references:
Obsoletes: RHSA-2002:084
CVE Names: CAN-2002-0825 CAN-2002-0374
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1. Topic:
Updated nss_ldap packages are now available for Red Hat Linux 6.2, 7,
7.1, 7.2, and 7.3. These updates fix a potential buffer overflow
which can occur when nss_ldap is set to configure itself using
information stored in DNS, a format string bug in logging functions
used in pam_ldap, and to properly handle truncated DNS responses.
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:
nss_ldap is a set of C library extensions that allow X.500 and LDAP
directory servers to be used as a primary source of aliases, ethers,
groups, hosts, networks, protocols, users, RPCs, services, and shadow
passwords (instead of or in addition to using flat files or NIS).
When versions of nss_ldap prior to nss_ldap-198 are configured
without a value for the "host" setting, nss_ldap will attempt to
configure itself by using SRV records stored in DNS. When parsing
the results of the DNS query, nss_ldap does not check that the data
returned by the server will fit into an internal buffer, leaving it
vulnerable to a buffer overflow. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2002-0825
to this issue.
When versions of nss_ldap prior to nss_ldap-199 are configured
without a value for the "host" setting, nss_ldap will attempt to
configure itself by using SRV records stored in DNS. When parsing
the results of the DNS query, nss_ldap does not check that the data
returned has not been truncated by the resolver libraries to avoid a
buffer overflow, and may attempt to parse more data than is actually
available, leaving it vulnerable to a read buffer overflow.
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.
All users of nss_ldap should update to these errata packages which
are not vulnerable to the above issues. The errata packages are based
on nss_ldap-189 with the addition of a backported security patch and
pam_ldap version 144.
Thanks to the nss_ldap and pam_ldap team at padl.com for providing
information about these issues.
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 6.2:
SRPMS:
ftp://updates.redhat.com/6.2/en/os/SRPMS/nss_ldap-189-3.6.src.rpm
alpha:
ftp://updates.redhat.com/6.2/en/os/alpha/nss_ldap-189-3.6.alpha.rpm
i386:
ftp://updates.redhat.com/6.2/en/os/i386/nss_ldap-189-3.6.i386.rpm
sparc:
ftp://updates.redhat.com/6.2/en/os/sparc/nss_ldap-189-3.6.sparc.rpm
Red Hat Linux 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/nss_ldap-189-3.7.src.rpm
alpha:
ftp://updates.redhat.com/7.0/en/os/alpha/nss_ldap-189-3.7.alpha.rpm
i386:
ftp://updates.redhat.com/7.0/en/os/i386/nss_ldap-189-3.7.i386.rpm
Red Hat Linux 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/nss_ldap-189-3.7.src.rpm
alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/nss_ldap-189-3.7.alpha.rpm
i386:
ftp://updates.redhat.com/7.1/en/os/i386/nss_ldap-189-3.7.i386.rpm
ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/nss_ldap-189-3.7.ia64.rpm
Red Hat Linux 7.2:
SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/nss_ldap-189-4.src.rpm
i386:
ftp://updates.redhat.com/7.2/en/os/i386/nss_ldap-189-4.i386.rpm
ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/nss_ldap-189-4.ia64.rpm
Red Hat Linux 7.3:
SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/nss_ldap-189-4.src.rpm
i386:
ftp://updates.redhat.com/7.3/en/os/i386/nss_ldap-189-4.i386.rpm
6. Verification:
MD5 sum Package Name
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2acbcd575035a1afcb9e74694a6b7b39 6.2/en/os/SRPMS/nss_ldap-189-3.6.src.rpm
1a670c4c2a343b26508aa04ae06d2306 6.2/en/os/alpha/nss_ldap-189-3.6.alpha.rpm
4069002846304df7840cbe81517f8b3d 6.2/en/os/i386/nss_ldap-189-3.6.i386.rpm
e26b1be702d0bf65f455e17d16844354 6.2/en/os/sparc/nss_ldap-189-3.6.sparc.rpm
9b44c5148cd1d3d688a9603f11a4d794 7.0/en/os/SRPMS/nss_ldap-189-3.7.src.rpm
2d245d41c6a27b62670a0e3cbc48e93b 7.0/en/os/alpha/nss_ldap-189-3.7.alpha.rpm
5c34d52cfa0425e8b3d0e63838729703 7.0/en/os/i386/nss_ldap-189-3.7.i386.rpm
9b44c5148cd1d3d688a9603f11a4d794 7.1/en/os/SRPMS/nss_ldap-189-3.7.src.rpm
2d245d41c6a27b62670a0e3cbc48e93b 7.1/en/os/alpha/nss_ldap-189-3.7.alpha.rpm
5c34d52cfa0425e8b3d0e63838729703 7.1/en/os/i386/nss_ldap-189-3.7.i386.rpm
27c07eb113adebc7d79d48d8c9df9356 7.1/en/os/ia64/nss_ldap-189-3.7.ia64.rpm
d421772f8f5bd985dc2c288aee729ff6 7.2/en/os/SRPMS/nss_ldap-189-4.src.rpm
8dc0d40503cbc09a55a111fc53ec42ba 7.2/en/os/i386/nss_ldap-189-4.i386.rpm
acd545a47e2be38ed8c9b94ea9801e4c 7.2/en/os/ia64/nss_ldap-189-4.ia64.rpm
d421772f8f5bd985dc2c288aee729ff6 7.3/en/os/SRPMS/nss_ldap-189-4.src.rpm
8dc0d40503cbc09a55a111fc53ec42ba 7.3/en/os/i386/nss_ldap-189-4.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>
7. References:
http://www.padl.com/Articles/PotentialBufferOverflowin.html
http://www.padl.com/OSS/pam_ldap.html
http://archives.neohapsis.com/archives/vulnwatch/2002-q2/0053.html
http://www.kb.cert.org/vuls/id/738331
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0825
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0374
Copyright(c) 2000, 2001, 2002 Red Hat, Inc.
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