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(NetBSD Issues Fix) Sendmail Buffer Overflow in Parsing Addresses May Let Remote or Local Users Execute Arbitrary Code With Root Privileges
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SecurityTracker Alert ID: 1006481 |
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SecurityTracker URL: http://securitytracker.com/id/1006481
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CVE Reference:
CAN-2003-0161
(Links to External Site)
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Date: Apr 4 2003
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Impact:
Execution of arbitrary code via local system, Execution of arbitrary code via network, Root access via local system, Root access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 8.12.8 and prior versions
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Description:
A buffer overflow vulnerability was reported in Sendmail in the address parsing code. A remote or local user could cause arbitrary code to be executed with root privileges.
The flaw reportedly resides in 'parseaddr.c' in a char to int variable conversion. Data received from untrusted sources, potentially including e-mail addresses or DNS domain names, that contain extended ASCII characters and that are longer than a certain size may be able to trigger the flaw and cause code to be executed.
The vendor is reporting this as a "critical security problem."
The vendor credits Michal Zalewski for reporting the flaw.
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Impact:
A remote or local user could cause arbitrary code to be executed with root privileges.
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Solution:
NetBSD has released a fix.
NetBSD-current:
Systems running NetBSD-current dated from before 2003-03-30 should be upgraded to NetBSD-current dated 2003-03-31 or later.
The following directories need to be updated from the netbsd-current CVS branch (aka HEAD):
gnu/dist/sendmail/sendmail
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P gnu/dist/sendmail/sendmail
# cd gnu/usr.sbin/sendmail
# make USETOOLS=no cleandir dependall
# make USETOOLS=no install
NetBSD 1.6:
The binary distribution of NetBSD 1.6 is vulnerable. Systems running NetBSD 1.6 sources dated from before 2003-03-30 should be upgraded from NetBSD 1.6 sources dated 2003-03-31 or later.
NetBSD 1.6.1 will include the fix.
The following directories need to be updated from the netbsd-1-6 CVS branch:
gnu/dist/sendmail/sendmail
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P -r netbsd-1-6 gnu/dist/sendmail/sendmail
# 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 1.5.3 is vulnerable.
Systems running NetBSD 1.5, 1.5.1, 1.5.2, or 1.5.3 sources dated from before 2003-04-01 should be upgraded from NetBSD 1.5.* sources dated 2003-04-02 or later.
The following directories need to be updated from the netbsd-1-5 CVS branch:
gnu/dist/sendmail/sendmail
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P -r netbsd-1-5 gnu/dist/sendmail/sendmail
# cd gnu/usr.sbin/sendmail
# make cleandir dependall
# make install
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Vendor URL: www.sendmail.org/8.12.9.html (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
UNIX (NetBSD)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Fri, 4 Apr 2003 11:44:25 -0500
Subject: NetBSD Security Advisory 2003-009: sendmail buffer overrun in prescan() address parser
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-----BEGIN PGP SIGNED MESSAGE-----
NetBSD Security Advisory 2003-009
=================================
Topic: sendmail buffer overrun in prescan() address parser
Version: NetBSD-current: source prior to Mar 30, 2003
NetBSD 1.6: affected
NetBSD-1.5.3: affected
NetBSD-1.5.2: affected
NetBSD-1.5.1: affected
NetBSD-1.5: affected
pkgsrc: prior to sendmail-8.12.9
Severity: Remote root compromise
Fixed: NetBSD-current: March 30, 2003
NetBSD-1.6 branch: March 30, 2003 (1.6.1 will include the fix)
NetBSD-1.5 branch: April 1, 2003
pkgsrc: sendmail-8.12.9 corrects this issue
Abstract
========
- From the CERT advisory:
There is a remotely exploitable vulnerability in sendmail that
could allow an attacker to gain control of a vulnerable sendmail
server. Address parsing code in sendmail does not adequately check
the length of email addresses. An email message with a specially
crafted address could trigger a stack overflow. This vulnerability
was discovered by Michal Zalewski.
This vulnerability is different than the one described in CA-2003-07.
It is a different vulnerability than NetBSD SA2003-002.
Technical Details
=================
http://www.cert.org/advisories/CA-2003-12.html
Solutions and Workarounds
=========================
We advise sites running sendmail to upgrade as soon as possible. If upgrading
is impossible at this time, we recommend you turn off the sendmail service.
To determine if sendmail is running on your system, issue the command:
# /etc/rc.d/sendmail status
To stop currently running sendmail processes, issue the command:
# /etc/rc.d/sendmail stop
To ensure sendmail does not start after the next reboot, issue the command:
# echo "sendmail=NO" >>/etc/rc.conf.d/sendmail
To allow sendmail to start once upgraded, remove the sendmail=NO line
from the end of /etc/rc.conf.d/sendmail.
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 2003-03-30
should be upgraded to NetBSD-current dated 2003-03-31 or later.
The following directories need to be updated from the
netbsd-current CVS branch (aka HEAD):
gnu/dist/sendmail/sendmail
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P gnu/dist/sendmail/sendmail
# cd gnu/usr.sbin/sendmail
# make USETOOLS=no cleandir dependall
# make USETOOLS=no install
* NetBSD 1.6:
The binary distribution of NetBSD 1.6 is vulnerable.
Systems running NetBSD 1.6 sources dated from before
2003-03-30 should be upgraded from NetBSD 1.6 sources dated
2003-03-31 or later.
NetBSD 1.6.1 will include the fix.
The following directories need to be updated from the
netbsd-1-6 CVS branch:
gnu/dist/sendmail/sendmail
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P -r netbsd-1-6 gnu/dist/sendmail/sendmail
# 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 1.5.3 is vulnerable.
Systems running NetBSD 1.5, 1.5.1, 1.5.2, or 1.5.3 sources dated
from before 2003-04-01 should be upgraded from NetBSD 1.5.*
sources dated 2003-04-02 or later.
The following directories need to be updated from the
netbsd-1-5 CVS branch:
gnu/dist/sendmail/sendmail
To update from CVS, re-build, and re-install sendmail:
# cd src
# cvs update -d -P -r netbsd-1-5 gnu/dist/sendmail/sendmail
# cd gnu/usr.sbin/sendmail
# make cleandir dependall
# make install
Thanks To
=========
Michal Zalewski and CERT for notification.
Andrew Brown for patches.
Revision History
================
2003-04-04 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-SA2003-009.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-SA2003-009.txt,v 1.2 2003/04/04 05:52:33 david Exp $
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