NetBSD Security Advisory 2001-018

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NetBSD Security Advisory 2001-018
=================================

Topic: Remote Buffer Overflow Vulnerability in BSD Line Printer Daemon

Version: NetBSD-current: prior to August 28, 2001
NetBSD-1.5.2: affected
NetBSD-1.5.1: affected
NetBSD-1.5: affected
NetBSD-1.4.*: affected

Severity: Remote root compromise from any host which can connect to lpd(8)

Fixed: NetBSD-current: August 28, 2001
NetBSD-1.5 branch: September 30, 2001
NetBSD-1.4 branch: not yet

Abstract
========

There is an remotely exploitable buffer overrun in the printer daemon,
/usr/sbin/lpd.

Technical Details
=================

http://msgs.securepoint.com/cgi-bin/get/bugtraq0108/259.html

Solutions and Workarounds
=========================

NetBSD 1.3 and later install with lpd disabled by default. A system is
vulnerable to this security hole only if it is running /usr/sbin/lpd,
and access to lpd is allowed by entries in /etc/hosts.lpd. Updating
the binary for safety is recommended.

Quick workaround:
If you are running /usr/sbin/lpd, and you do not need it, stop it.
If you have /etc/hosts.lpd which is open to everyone, you will want to
tighten the setup so that no malicious parties can access your remote printer.

Solutions:

* NetBSD -current, 1.5, 1.5.1, 1.5.2:

Systems running NetBSD-current dated from before 2001-08-28
should be upgraded to NetBSD-current dated 2001-08-28 or later.

Systems running NetBSD 1.5, 1.5.1 or 1.5.2 dated from before
2001-09-30 should be upgraded to NetBSD-1.5 branch sources dated
2001-09-30 or later.

The following directory needs to be updated from the
netbsd-current CVS branch (aka HEAD) for NetBSD-current,
or netbsd-1-5 CVS branch for NetBSD 1.5, 1.5.1 or 1.5.2:
src/usr.sbin/lpr

To update from CVS, re-build, and re-install lpd(8):
# cd src/usr.sbin/lpr
# cvs update -d -P
# make cleandir dependall install

Alternatively, apply the following patch (with potential offset
differences) and rebuild & re-install lpd(8):
ftp://ftp.netbsd.org/pub/NetBSD/security/patches/SA2001-018-lpd.patch

To patch, re-build and re-install lpd(8):
# cd src/usr.sbin/lpr/common_sources
# patch < /path/to/SA2001-012-lpd.patch
# cd ../lpd
# make cleandir dependall install

* NetBSD 1.4, 1.4.x:

Systems running NetBSD-1.4.x releases should apply the following
patch (with potential offset differences):
ftp://ftp.netbsd.org/pub/NetBSD/security/patches/SA2001-018-lpd.patch

To patch, re-build and re-install lpd(8):
# cd src/usr.sbin/lpr/common_sources
# patch < /path/to/SA2001-012-lpd.patch
# cd ../lpd
# make cleandir dependall install

The anonymous CVS branch netbsd-1-4 should be updated with a
fix in the near future.

Thanks To
=========

Jun-ichiro Hagino for the original patches to -current, from a fix in
OpenBSD

John Messenger for correcting errors in the update instructions.

Revision History
================

2001-11-22 Initial release
2001-11-28 Correct instructions for patch usage.

More Information
================

An up-to-date PGP signed copy of this release will be maintained at
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2001-018.txt.asc

Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.ORG/ and http://www.NetBSD.ORG/Security/.

Copyright 2001, The NetBSD Foundation, Inc. All Rights Reserved.

$NetBSD: NetBSD-SA2001-018.txt,v 1.7 2001/11/28 05:39:37 david Exp $

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