5560679 2000-10-07 01:36 /167 rader/ Brevbäraren (som är implementerad i) Python
Mottagare: Root (@) Nationernas Hus <12638>
Mottagare: Red Hat Announce (import) <1599>
Sänt: 2000-10-07 01:36
Ärende: [RHSA-2000:066-05] lpr has a format string security bug, LPRng compat issues, and a race cond.
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From: bugzilla@redhat.com
To: redhat-watch-list@redhat.com
Cc: bugtraq@securityfocus.com, linux-security@redhat.com
Message-ID: <200010042152.e94LqAE10496@porkchop.redhat.com>
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Red Hat, Inc. Security Advisory
Synopsis: lpr has a format string security bug, LPRng compat issues, and a race cond.
Advisory ID: RHSA-2000:066-05
Issue date: 2000-09-25
Updated on: 2000-10-04
Product: Red Hat Linux
Keywords: lpr security lpd LPRng
Cross references: N/A
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1. Topic:
lpr has a format string security bug. It also mishandles any
extension to the lpd communication protocol, and assumes that the
instructions contained in the extension are a file it should try to
print. It also has a race condition in the handling of queue
interactions that can cause the queue to wedge.
Note: Packages indicated in revision -03 and earlier were not signed
with the Red Hat GPG key. This has been corrected.
2. Relevant releases/architectures:
Red Hat Linux 5.0 - i386, alpha
Red Hat Linux 5.1 - i386, alpha, sparc
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:
The old BSD-based lpr which we shipped with Red Hat Linux 5.x and 6.x
has a recently discovered format string bug in its calls to the
syslog facility. While we are not aware of any exploits for this
issue, it might be possible for a user to gain local root access.
For this reason, upgrading to the new lpr is strongly encouraged.
Additionally, lpr did not properly handle extensions to the lpd
protocol. LPRng, an advanced replacement for lpr included in Red Hat
Linux 7, makes use of extensions. The lpr included in Red Hat Linux
6.2 and earlier will not recognize these extensions, and attempt to
handle the instructions as if they were a file to be printed. As a
result, the lpr system sends out three of the following email
messages per print job:
Date: Thu, 10 Aug 2000 21:36:32 -0400
From: bin <bin@redhat.com>
Reply-To: root@yyyyy.redhat.com
To: xxxx@xxxxxx.redhat.com
Subject: lp printer job "(stdin)"
Your printer job ((stdin))
was not printed because the daemon could not stat the file
Additionaly, a race condition exists in the contention for the lock
file, making it posible for the queue to get into a wedged state.
These problems are now fixed.
4. Solution:
For each RPM for your particular architecture, run:
rpm -Fvh [filename]
where filename is the name of the RPM.
Additionally, after upgrading, you will want to restart your "lpd"
service by executing the following as root:
/etc/rc.d/init.d/lpd restart
If you do not need printing at all on your system, we recommend you
remove the lpr print system:
/etc/rc.d/init.d/lpd stop
rpm -e lpr
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
16032 - LPRng lpd/BSD lpd generate stat errors in LPRng->BSD queue
interactions. 11740 - Race condition in locking for LPD 16725 - BSD
lpr 0.50-5 Errata Tracking Bug
6. RPMs required:
Red Hat Linux 5.2:
alpha:
ftp://updates.redhat.com/5.2/alpha/lpr-0.50-7.5.x.alpha.rpm
sparc:
ftp://updates.redhat.com/5.2/sparc/lpr-0.50-7.5.x.sparc.rpm
i386:
ftp://updates.redhat.com/5.2/i386/lpr-0.50-7.5.x.i386.rpm
sources:
ftp://updates.redhat.com/5.2/SRPMS/lpr-0.50-7.5.x.src.rpm
Red Hat Linux 6.x:
alpha:
ftp://updates.redhat.com/6.2/alpha/lpr-0.50-7.6.x.alpha.rpm
sparc:
ftp://updates.redhat.com/6.2/sparc/lpr-0.50-7.6.x.sparc.rpm
i386:
ftp://updates.redhat.com/6.2/i386/lpr-0.50-7.6.x.i386.rpm
sources:
ftp://updates.redhat.com/6.2/SRPMS/lpr-0.50-7.6.x.src.rpm
7. Verification:
MD5 sum Package Name
--------------------------------------------------------------------------
c4c0311c59fd741507a41ce6705d7b11 5.2/SRPMS/lpr-0.50-7.5.x.src.rpm
3ee5d7ae89389678c48a881ea9f13de3 5.2/alpha/lpr-0.50-7.5.x.alpha.rpm
1a516bb638568f516beda7dd98c8ee1b 5.2/i386/lpr-0.50-7.5.x.i386.rpm
73308d3778f5f9f953c794cecd98dde4 5.2/sparc/lpr-0.50-7.5.x.sparc.rpm
49d59ce8e0347a59a55ae10e142ad709 6.2/SRPMS/lpr-0.50-7.6.x.src.rpm
031b2bb377ec41ca2f1b924a0e92fad6 6.2/alpha/lpr-0.50-7.6.x.alpha.rpm
d1576d4478830b78f2368935eb59044a 6.2/i386/lpr-0.50-7.6.x.i386.rpm
031b953bd97f40e5b9f11696ac27c4d5 6.2/sparc/lpr-0.50-7.6.x.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 Chris Evans <chris@scary.beasts.org> for spotting this
in the OpenBSD lpr CVS commit logs, and verifying the problem existed
for Linux as well.
Copyright(c) 2000 Red Hat, Inc.
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