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Category:   Application (Security)  >   OpenSSL Vendors:   OpenSSL.org
(Red Hat Issues Fix for RH Linux) OpenSSL SSL/TLS Handshade Flaws May Let Remote Users Crash OpenSSL-based Applications
SecurityTracker Alert ID:  1009475
SecurityTracker URL:  http://securitytracker.com/id/1009475
CVE Reference:   CVE-2004-0079, CVE-2004-0081, CVE-2004-0112   (Links to External Site)
Date:  Mar 17 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.6c - 0.9.6k and 0.9.7a - 0.9.7c
Description:   Some vulnerabilities were reported in OpenSSL, primarily involving the processing of SSL/TLS protocol handshakes. A remote user can cause OpenSSL to crash.

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.

Impact:   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.
Solution:   Red Hat has released a fix.

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/openssl-0.9.7a-20.2.src.rpm
ftp://updates.redhat.com/9/en/os/SRPMS/openssl096-0.9.6-25.9.src.rpm
ftp://updates.redhat.com/9/en/os/SRPMS/openssl096b-0.9.6b-15.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/openssl-0.9.7a-20.2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/openssl-devel-0.9.7a-20.2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/openssl-perl-0.9.7a-20.2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/openssl096-0.9.6-25.9.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/openssl096b-0.9.6b-15.i386.rpm

i686:
ftp://updates.redhat.com/9/en/os/i686/openssl-0.9.7a-20.2.i686.rpm

The verification checksums are:

MD5 sum Package Name

fccbfa420f0e35abf2e3f1b7cfda504b 9/en/os/SRPMS/openssl-0.9.7a-20.2.src.rpm
6596a94a38bab238fcdf44f39fa9286a 9/en/os/SRPMS/openssl096-0.9.6-25.9.src.rpm
aec0dff60087c0deb0a3c7dbfe913b09 9/en/os/SRPMS/openssl096b-0.9.6b-15.src.rpm
9fbb1bc859dc155cfcb697b08d47c2b4 9/en/os/i386/openssl-0.9.7a-20.2.i386.rpm
2e29e4f4d0d2094f4adef29bda25f33f 9/en/os/i386/openssl-devel-0.9.7a-20.2.i386.rpm
edc37f7dea6dd4eb9ef3b04546f58661 9/en/os/i386/openssl-perl-0.9.7a-20.2.i386.rpm
efba1c47b07e268b6181dd3d712813fa 9/en/os/i386/openssl096-0.9.6-25.9.i386.rpm
b49b6268f779cfd8284a375bf03d6641 9/en/os/i386/openssl096b-0.9.6b-15.i386.rpm
e39bbb9c8235f9b6584eb8472f68a68c 9/en/os/i686/openssl-0.9.7a-20.2.i686.rpm

Vendor URL:  www.openssl.org/news/secadv_20040317.txt (Links to External Site)
Cause:   Boundary error, Exception handling error, State error
Underlying OS:  Linux (Red Hat Linux)
Underlying OS Comments:  9

Message History:   This archive entry is a follow-up to the message listed below.
Mar 17 2004 OpenSSL SSL/TLS Handshade Flaws May Let Remote Users Crash OpenSSL-based Applications



 Source Message Contents

Subject:  [RHSA-2004:121-01] Updated OpenSSL packages fix vulnerabilities


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Updated OpenSSL packages fix vulnerabilities
Advisory ID:       RHSA-2004:121-01
Issue date:        2004-03-17
Updated on:        2004-03-17
Product:           Red Hat Linux
Keywords:          DoS
Cross references:  
Obsoletes:         RHBA-2003:292
CVE Names:         CAN-2004-0079 CAN-2004-0081 CAN-2004-0112
- ---------------------------------------------------------------------

1. Topic:

Updated OpenSSL packages that fix several remote denial of service
vulnerabilities are now available.

2. Relevant releases/architectures:

Red Hat Linux 9 - i386, i686

3. Problem description:

OpenSSL is a toolkit that implements Secure Sockets Layer (SSL v2/v3) and
Transport Layer Security (TLS v1) protocols as well as a full-strength
general purpose cryptography library.

Testing performed by the OpenSSL group using the Codenomicon TLS Test Tool
uncovered a null-pointer assignment in the do_change_cipher_spec() function
in OpenSSL 0.9.6c-0.9.6l and 0.9.7a-0.9.7c.  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.  The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2004-0079 to this issue.

Stephen Henson discovered a flaw in the SSL/TLS handshaking code when using
Kerberos ciphersuites in OpenSSL 0.9.7a-0.9.7c.  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 are
therefore unaffected by this issue.  The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2004-0112 to
this issue.

Testing performed by the OpenSSL group using the Codenomicon TLS Test Tool
uncovered a bug in older versions of OpenSSL 0.9.6 prior to 0.9.6d that can
lead to a denial of service attack (infinite loop).  The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2004-0081 to this issue.  This issue affects only the OpenSSL
compatibility packages shipped with Red Hat Linux 9.

These updated packages contain patches provided by the OpenSSL group that
protect against these issues.

NOTE: Because server applications are affected by this issue, users are
advised to either restart all services using OpenSSL functionality or
restart their system after installing these updated packages.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

If up2date fails to connect to Red Hat Network due to SSL
Certificate Errors, you need to install a version of the
up2date client with an updated certificate.  The latest version of
up2date is available from the Red Hat FTP site and may also be
downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

5. RPMs required:

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/openssl-0.9.7a-20.2.src.rpm
ftp://updates.redhat.com/9/en/os/SRPMS/openssl096-0.9.6-25.9.src.rpm
ftp://updates.redhat.com/9/en/os/SRPMS/openssl096b-0.9.6b-15.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/openssl-0.9.7a-20.2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/openssl-devel-0.9.7a-20.2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/openssl-perl-0.9.7a-20.2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/openssl096-0.9.6-25.9.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/openssl096b-0.9.6b-15.i386.rpm

i686:
ftp://updates.redhat.com/9/en/os/i686/openssl-0.9.7a-20.2.i686.rpm



6. Verificationx:

MD5 sum                          Package Name
- --------------------------------------------------------------------------

fccbfa420f0e35abf2e3f1b7cfda504b 9/en/os/SRPMS/openssl-0.9.7a-20.2.src.rpm
6596a94a38bab238fcdf44f39fa9286a 9/en/os/SRPMS/openssl096-0.9.6-25.9.src.rpm
aec0dff60087c0deb0a3c7dbfe913b09 9/en/os/SRPMS/openssl096b-0.9.6b-15.src.rpm
9fbb1bc859dc155cfcb697b08d47c2b4 9/en/os/i386/openssl-0.9.7a-20.2.i386.rpm
2e29e4f4d0d2094f4adef29bda25f33f 9/en/os/i386/openssl-devel-0.9.7a-20.2.i386.rpm
edc37f7dea6dd4eb9ef3b04546f58661 9/en/os/i386/openssl-perl-0.9.7a-20.2.i386.rpm
efba1c47b07e268b6181dd3d712813fa 9/en/os/i386/openssl096-0.9.6-25.9.i386.rpm
b49b6268f779cfd8284a375bf03d6641 9/en/os/i386/openssl096b-0.9.6b-15.i386.rpm
e39bbb9c8235f9b6584eb8472f68a68c 9/en/os/i686/openssl-0.9.7a-20.2.i686.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/keys.html

You can verify each package with the following command:
    
    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    
    md5sum <filename>


7. References:

http://www.codenomicon.com/testtools/tls/
http://www.niscc.gov.uk/
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0079
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0081
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0112

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQFAWNA9XlSAg2UNWIIRAueUAJ9npgzRI6b5FVmdPlj1qaCSE3RVpwCeKOYO
VwCC1PE86JVf92FSz1w/OeE=
=CT5X
-----END PGP SIGNATURE-----


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