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AUSCERT External Security Bulletin Redistribution
ESB-2000.274 -- RHSA-2000:065-04
LPRng contains a critical string format bug
5 October 2000
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AusCERT Security Bulletin Summary
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Product: LPRng
Vendor: Red Hat
Operating System: Red Hat Linux
Linux
Impact: Root Compromise
Access Required: Remote
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Red Hat, Inc. Security Advisory
Synopsis: LPRng contains a critical string format bug
Advisory ID: RHSA-2000:065-04
Issue date: 2000-09-26
Updated on: 2000-10-04
Product: Red Hat Linux
Keywords: LPRng security lpd printing lpr syslog
Cross references: N/A
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1. Topic:
LPRng has a string format bug in the use_syslog function which could lead
to root compromise.
2. Relevant releases/architectures:
Red Hat Linux 7.0 - i386
3. Problem description:
LPRng has a string format bug in the use_syslog function. This function
returns user input in a string that is passed to the syslog() function as
the format string. It is possible to corrupt the print daemon's execution
with unexpected format specifiers, thus gaining root access to the
computer. The vulnerability is theoretically exploitable both locally and
remotely.
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):
17756 - Critical security hole in LPRng, remote root
6. RPMs required:
Red Hat Linux 7.0:
i386:
ftp://updates.redhat.com/7.0/i386/LPRng-3.6.24-2.i386.rpm
sources:
ftp://updates.redhat.com/7.0/SRPMS/LPRng-3.6.24-2.src.rpm
7. Verification:
MD5 sum Package Name
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c1fc795122b067dd9549aceb75bf5694 7.0/SRPMS/LPRng-3.6.24-2.src.rpm
05251e71ae5f2d2fdbc6611eea6f8651 7.0/i386/LPRng-3.6.24-2.i386.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:
Originally reported to bugtraq by Chris Evans <chris@scary.beasts.org> on
25 Sep, 2000.
Copyright(c) 2000 Red Hat, Inc.
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