(HP Issues Fix for HP-UX AAA Server) OpenSSL SSL/TLS Handshade Flaws May Let Remote Users Crash OpenSSL-based Applications
SecurityTracker Alert ID: 1009718|
SecurityTracker URL: http://securitytracker.com/id/1009718
CVE-2004-0079, CVE-2004-0081, CVE-2004-0112
(Links to External Site)
Date: Apr 9 2004
Denial of service via network|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): A.06.01.02.06 and prior versions|
Some vulnerabilities were reported in OpenSSL, primarily involving the processing of SSL/TLS protocol handshakes. A remote user can cause OpenSSL to crash. The HP-UX AAA Server is affected.|
It is reported that there is a null-pointer assignment in the do_change_cipher_spec() function [CVE: CVE-2004-0079]. A remote user can perform a specially crafted SSL/TLS handshake with a target server to cause OpenSSL to crash on the target system. This may cause the application using OpenSSL to crash.
All versions of OpenSSL from 0.9.6c to 0.9.6k inclusive and from 0.9.7a to 0.9.7c inclusive are reportedly vulnerable to this null-pointer bug.
It is also reported that there is a flaw in performing SSL/TLS handshakes using Kerberos ciphersuites [CVE: CVE-2004-0112]. A remote user can perform a specially crafted SSL/TLS handshake against a server that is using Kerberos ciphersuites to cause OpenSSL to crash on the target system.
OpenSSL versions 0.9.7a, 0.9.7b, and 0.9.7c are reported to be vulnerable to this Kerberos handshake bug.
It is also reported that a remote user may be able to cause OpenSSL to enter an infinite loop due to a flaw in a patch introduced in 0.9.6d [CVE: CVE-2004-0081].
The vendor credits Dr. Stephen Henson of the OpenSSL core team as well as Codenomicon for supplying their TLS Test Tool and Joe Orton of Red Hat for performing the majority of the testing.
A remote user can cause OpenSSL to crash, which may cause an application using OpenSSL to crash. The specific impact depends on the application that uses the OpenSSL library.|
HP has issued a fixed version (A.06.01.02.07) of the HP-UX AAA Server, available at:|
Boundary error, Exception handling error, State error|
|Underlying OS: UNIX (HP/UX)|
|Underlying OS Comments: 11.00, 11.11, 11.23|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: SSRT3622 rev.0 HP-UX remote denial of service using AAA Server|
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HP SECURITY BULLETIN
HPSBUX01011 REVISION: 0
SSRT3622 rev.0 HP-UX remote denial of service using AAA Server
NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.
The information in this Security bulletin should be acted
upon as soon as possible.
INITIAL RELEASE: 8 April 2004
LAST UPDATED: 8 April 2004
POTENTIAL SECURITY IMPACT: Remote denial of service
SOURCE: HEWLETT-PACKARD COMPANY
HP Software Security Response Team
REFERENCES: CAN-2004-0079, CAN-2004-0112, CAN-2004-0081,
A potential security vulnerability has been identified with
the HP-UX AAA server where an unauthenticated remote attacker
could cause a denial of service.
SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP-UX B.11.00, and B.11.11 running HP-UX AAA Server A.06.01.02.04
HP-UX B.11.23 running HP-UX AAA Server A.06.01.02.06.
The HP-UX AAA Server uses components of the OpenSSL functions
internally and is therefore vulnerable to the following items.
CAN-2004-0079: Testing performed by the OpenSSL group using
the Codenomicon TLS Test Tool uncovered a null-pointer
assignment in the do_change_cipher_spec() function. A remote
attacker could perform a carefully crafted SSL/TLS handshake
against a server that used the OpenSSL library in such a way
as to cause OpenSSL to crash. Depending on the application this
could lead to a denial of service. All versions of OpenSSL from
0.9.6c to 0.9.6k inclusive and from 0.9.7a to 0.9.7c inclusive
are affected by this issue.
CAN-2004-0112: Stephen Henson discovered a flaw in SSL/TLS
handshaking code when using Kerberos ciphersuites. A remote
attacker could perform a carefully crafted SSL/TLS handshake
against a server configured to use Kerberos ciphersuites in
such a way as to cause OpenSSL to crash. Most applications have
no ability to use Kerberos ciphersuites and will therefore be
unaffected. Versions 0.9.7a, 0.9.7b, and 0.9.7c of OpenSSL are
affected by this issue.
CAN-2004-0081: Testing performed by the OpenSSL group using
the Codenomicon TLS Test Tool uncovered a bug in older versions
of OpenSSL 0.9.6 that can lead to a Denial of Service attack
(infinite loop). This issue was traced this to a fix that was
added to OpenSSL 0.9.6d some time ago.
Note: To determine if a system has an affected version, search
the output of "swlist -a revision -l fileset"
for an affected fileset. Then determine if the recommended patch
or update is installed.
action: install revision A.06.01.02.07 or subsequent.
END AFFECTED VERSIONS
For HP-UX releases B.11.00, B.11.11, and B.11.23, download
a new HP-UX AAA Server product A.06.01.02.07 or later from
in order to completely resolve these issues. This product
includes OpenSSL 0.9.7c + patch.
Please write to email@example.com to request a PGP
signed version of this bulletin.
MANUAL ACTIONS: Yes - Update
to download a current version of the HP-UX AAA Server software.
* The software product category that this Security Bulletin
relates to is represented by the 5th and 6th characters of the
GN=General, MA=Management Agents, MI=Misc. 3rd party,
MP=HP-MPE/iX, NS=HP NonStop Servers, OV=HP OpenVMS,
PI=HP Printing & Imaging, ST=HP Storage, TU=HP Tru64 UNIX,
TL=Trusted Linux, UX=HP-UX, VV=VirtualVault
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Copyright 2004 Hewlett-Packard Development Company, L.P.
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