Date: Wed, 4 Oct 2000 12:04:00 -0400
From: bugzilla@REDHAT.COM
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: [RHSA-2000:065-04] LPRng contains a critical string format
bug
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
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
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.