NetBSD Security Advisory 2003-016: Sendmail - another prescan() bug CAN-2003-0694
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NetBSD Security Advisory 2003-016
=================================
Topic: Sendmail - another prescan() bug CAN-2003-0694
Version: NetBSD-current: source prior to September 18, 2003
NetBSD 1.6.1: affected
NetBSD 1.6: affected
NetBSD-1.5.3: affected
NetBSD-1.5.2: affected
NetBSD-1.5.1: affected
NetBSD-1.5: affected
pkgsrc: sendmail packages prior to 8.12.10
Severity: Remote exploit
Fixed: NetBSD-current: September 18, 2003
NetBSD-1.6 branch: September 18, 2003 (1.6.2 will include
the fix)
NetBSD-1.5 branch: September 19, 2003
pkgsrc: sendmail-8.12.10 corrects this issue
Abstract
========
- From sendmail 8.12.10 release notes (http://www.sendmail.org/8.12.10.html):
SECURITY: Fix a buffer overflow in address parsing. Problem
detected by Michal Zalewski, patch from Todd C. Miller
of Courtesan Consulting.
Sendmail does not run by default on NetBSD installations.
Sendmail does not run as root when enabled on modern NetBSD installations.
However, a remote exploit of the sendmail (smmsp - Sendmail Message
Submission Program) uid could lead to opportunities to apply local
exploits to further elevate privileges.
Technical Details
=================
http://www.sendmail.org/8.12.10.html
http://www.cert.org/advisories/CA-2003-25.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0694
Solutions and Workarounds
=========================
NetBSD releases since 1.5 have included the option of using the Postfix
mail system as an alternative to sendmail. For simple site
configurations, switching between sendmail and Postfix is relatively
easy, and provides a workaround to any sendmail security issues.
An upgrade of the sendmail daemon is required to address this problem.
If you have a running instance of sendmail on your system, it must
be restarted once the installed binary is updated.
The following version string identifies a patched version; if you have
one of these versions, your system is already safe.
NetBSD-current: 8.12.9p1
NetBSD-1.6.x: 8.11.6p3
NetBSD-1.5.x: 8.11.6p3
The following instructions describe how to upgrade your sendmail
binaries by updating your source tree and rebuilding and
installing a new version of sendmail.
* NetBSD-current:
Systems running NetBSD-current dated from before 2003-09-17
should be upgraded to NetBSD-current dated 2003-09-18 or later.
The following directories need to be updated from the
netbsd-current CVS branch (aka HEAD):
src/gnu/dist/sendmail/sendmail/parseaddr.c
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P gnu/dist/sendmail/sendmail/parseaddr.c
# cd gnu/usr.sbin/sendmail
# make USETOOLS=no cleandir dependall
# make USETOOLS=no install
* NetBSD 1.6, 1.6.1:
The binary distribution of NetBSD 1.6 and 1.6.1 are vulnerable.
Systems running NetBSD 1.6 sources dated from before
2003-09-17 should be upgraded from NetBSD 1.6 sources dated
2003-09-18 or later.
NetBSD 1.6.2 will include the fix.
The following directories need to be updated from the
netbsd-1-6 CVS branch:
src/gnu/dist/sendmail/sendmail/parseaddr.c
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P -r netbsd-1-6 \
gnu/dist/sendmail/sendmail/parseaddr.c
# cd gnu/usr.sbin/sendmail
# make USETOOLS=no cleandir dependall
# make USETOOLS=no install
* NetBSD 1.5, 1.5.1, 1.5.2, 1.5.3:
The binary distribution of NetBSD 1.5 to 1.5.3 are vulnerable.
Systems running NetBSD 1.5, 1.5.1, 1.5.2, or 1.5.3 sources dated
from before 2003-09-18 should be upgraded from NetBSD 1.5.*
sources dated 2003-09-19 or later.
The following directories need to be updated from the
netbsd-1-5 CVS branch:
src/gnu/dist/sendmail/sendmail/parseaddr.c
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P -r netbsd-1-5 \
gnu/dist/sendmail/sendmail/parseaddr.c
# cd gnu/usr.sbin/sendmail
# make cleandir dependall
# make install
Thanks To
=========
Andrew Brown, and CERT
Revision History
================
2003-10-09 Initial release
More Information
================
Advisories may be updated as new information becomes available.
The most recent version of this advisory (PGP signed) can be found at
ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2003-016.txt.asc
Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.
Copyright 2003, The NetBSD Foundation, Inc. All Rights Reserved.
Redistribution permitted only in full, unmodified form.
$NetBSD: NetBSD-SA2003-016.txt,v 1.5 2003/10/09 17:49:45 david Exp $
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