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AUSCERT External Security Bulletin Redistribution
ESB-2004.0294 -- NetBSD Security Advisory 2004-005
Denial of service vulnerabilities in OpenSSL
22 April 2004
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: OpenSSL packages prior to 0.9.6m
Publisher: NetBSD
Operating System: NetBSD-current source prior to 22/03/2004
NetBSD 1.6.2 and prior
Impact: Denial of Service
Access Required: Remote
CVE Names: CAN-2004-0079 CAN-2004-0079
Ref: ESB-2004.0216
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NetBSD Security Advisory 2004-005
=================================
Topic: Denial of service vulnerabilities in OpenSSL
Version: NetBSD-current: source prior to March 22, 2004
NetBSD 2.0: branch unaffected, release will include the fix
NetBSD 1.6.2: affected
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: security/openssl packages prior to 0.9.6m
Severity: Possible denial of service, depending on the application
Fixed: NetBSD-current: March 22, 2004
NetBSD-1.6 branch: April 2, 2004
(1.6.3 will include the fix)
NetBSD-1.5 branch: April 7, 2004
pkgsrc: openssl-0.9.6m corrects this issue
Abstract
========
There are two distinct denial of service vulnerabilities addressed by this
advisory:
1. Null-pointer assignment during SSL handshake
A carefully crafted SSL/TLS handshake against a server which
uses the OpenSSL library may result in a crash. Depending on how
the application uses the OpenSSL library, this may result in a
denial of service.
2. Out-of-bounds read affects Kerberos ciphersuites
A second flaw in the SSL/TLS handshake could cause a server
configured to use the Kerberos ciphersuites to crash if a carefully
crafted sequence of packets is sent by an attacker.
Solutions and Workarounds
=========================
The following instructions describe how to upgrade your libcrypto and libssl
libraries by updating your source tree and rebuilding and
installing a new versions.
* NetBSD-current:
Systems running NetBSD-current dated from before 2004-03-22
should be upgraded to NetBSD-current dated 2004-03-23 or later.
The following directories need to be updated from the
netbsd-current CVS branch (aka HEAD):
crypto/dist/openssl
To update from CVS, re-build, and re-install libcrypto and libssl
# cd src
# cvs update -d -P crypto/dist/openssl
# cd lib/libcrypto
# make cleandir dependall
# make install
# cd ../../lib/libssl
# make USETOOLS=no cleandir dependall
# make USETOOLS=no install
* NetBSD 1.6, 1.6.1, 1.6.2:
The binary distribution of NetBSD 1.6, 1.6.1 and 1.6.2 are vulnerable.
Systems running NetBSD 1.6 sources dated from before
2004-04-02 should be upgraded from NetBSD 1.6 sources dated
2004-04-03 or later.
NetBSD 1.6.3 will include the fix.
The following directories need to be updated from the
netbsd-1-6 CVS branch:
crypto/dist/openssl
To update from CVS, re-build, and re-install libcrypto and libssl
# cd src
# cvs update -d -P -r netbsd-1-6 crypto/dist/openssl
# cd lib/libcrypto
# make cleandir dependall
# make install
# cd ../../lib/libssl
# 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 2004-04-07 should be upgraded from NetBSD 1.5.*
sources dated 2004-04-08 or later.
The following directories need to be updated from the
netbsd-1-5 CVS branch:
crypto/dist/openssl
To update from CVS, re-build, and re-install libcrypto and libssl
# cd src
# cvs update -d -P -r netbsd-1-5 crypto/dist/openssl
# cd lib/libcrypto
# make cleandir dependall
# make install
# cd ../../lib/libssl
# make cleandir dependall
# make install
Revision History
================
2004-04-21 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-SA2004-005.txt.asc
Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.
Copyright 2004, The NetBSD Foundation, Inc. All Rights Reserved.
Redistribution permitted only in full, unmodified form.
$NetBSD: NetBSD-SA2004-005.txt,v 1.3 2004/04/21 17:34:50 david Exp $
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