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AUSCERT External Security Bulletin Redistribution
ESB-2000.266 -- RHSA-2000:061-02
syslog format vulnerability in klogd
27 September 2000
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AusCERT Security Bulletin Summary
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Product: syslogd/klogd
Vendor: Red Hat
Operating System: Red Hat Linux
Linux
Impact: Root Compromise
Access Required: Local
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Red Hat, Inc. Security Advisory
Synopsis: syslog format vulnerability in klogd
Advisory ID: RHSA-2000:061-02
Issue date: 2000-09-18
Updated on: 2000-09-18
Product: Red Hat Linux
Keywords: syslog format string klogd syslogd
Cross references: N/A
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1. Topic:
Various vulnerabilities exist in syslogd/klogd. By exploiting these
vulnerabilities, it could be possible for local users to gain root
access. No remote exploit exists at this time, but it remains
theoretically possible that this vulnerability could be exploited
remotely under certain rare circumstances.
All users should upgrade to the new sysklogd packages. Users of
Red Hat Linux 6.0 and 6.1 should use the packages for Red Hat
Linux 6.2.
2. Relevant releases/architectures:
Red Hat Linux 5.2 - i386, alpha, sparc
Red Hat Linux 6.0 - i386, alpha, sparc
Red Hat Linux 6.1 - i386, alpha, sparc
Red Hat Linux 6.2 - i386, alpha, sparc
3. Problem description:
klogd contains instances of the:
syslog( LOG_INFO, buffer );
vulnerability that has been recently been discussed on Bugtraq and similar
mailing lists; by supplying some string that contains '%' escapes, it is
possible to have those escapes interpreted, which can lead to the ability
to gain root access.
Also, there are a couple of minor buffer overflow/termination problems that
could allow local users to crash syslogd and cause bogus messages to be
printed on the local system console.
The updated sysklogd packages fix these vulnerabilities/issues.
4. Solution:
For each RPM for your particular architecture, run:
rpm -Fvh [filename]
where filename is the name of the RPM.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
N/A
6. RPMs required:
Red Hat Linux 5.2:
sparc:
ftp://updates.redhat.com/5.2/sparc/sysklogd-1.3.31-1.6.sparc.rpm
alpha:
ftp://updates.redhat.com/5.2/alpha/sysklogd-1.3.31-1.6.alpha.rpm
i386:
ftp://updates.redhat.com/5.2/i386/sysklogd-1.3.31-1.6.i386.rpm
sources:
ftp://updates.redhat.com/5.2/SRPMS/sysklogd-1.3.31-1.6.src.rpm
Red Hat Linux 6.2:
sparc:
ftp://updates.redhat.com/6.2/sparc/sysklogd-1.3.31-17.sparc.rpm
i386:
ftp://updates.redhat.com/6.2/i386/sysklogd-1.3.31-17.i386.rpm
alpha:
ftp://updates.redhat.com/6.2/alpha/sysklogd-1.3.31-17.alpha.rpm
sources:
ftp://updates.redhat.com/6.2/SRPMS/sysklogd-1.3.31-17.src.rpm
7. Verification:
MD5 sum Package Name
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cd92613fc9a7409a90f6ff774e6e85d7 5.2/SRPMS/sysklogd-1.3.31-1.6.src.rpm
c7c44b7a38f4518daecca77cf7d45ba8 5.2/alpha/sysklogd-1.3.31-1.6.alpha.rpm
f100359030451c4be9b3bd99c3ec73a1 5.2/i386/sysklogd-1.3.31-1.6.i386.rpm
1c7f004ca29c966e0a03896f239d1317 5.2/sparc/sysklogd-1.3.31-1.6.sparc.rpm
69d50a8a9d490598fc11eef40fdf4552 6.2/SRPMS/sysklogd-1.3.31-17.src.rpm
2a7e2c7848d1f2d9607f3e6e3702cf2e 6.2/alpha/sysklogd-1.3.31-17.alpha.rpm
287d5022aa9d1a6ba9e03c51acc85229 6.2/i386/sysklogd-1.3.31-17.i386.rpm
150a05567dd4d626326028b1ac31f34d 6.2/sparc/sysklogd-1.3.31-17.sparc.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at:
http://www.redhat.com/corp/contact.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:
Thanks go to Jouko Pynnonen, Solar Designer, and Daniel Jacobowitz
for discovering the vulnerabilities and providing patches.
Copyright(c) 2000 Red Hat, Inc.
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