Gentoo Linux Security Advisory 200403-03: OpenSSL
Posted on: 03/18/2004 05:23 AM

The OpenSSL update is now available for Gentoo Linux

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Gentoo Linux Security Advisory GLSA 200403-03
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http://security.gentoo.org
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Severity: Normal
Title: Multiple OpenSSL Vulnerabilities
Date: March 17, 2004
Bugs: #44941
ID: 200403-03

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Synopsis
=======

Three vulnerabilities have been found in OpenSSL via a commercial test suite for the TLS protocol developed by Codenomicon Ltd.

Background
=========

The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.

Affected packages
================

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Package / Vulnerable / Unaffected
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dev-libs/openssl <= 0.9.7c >= 0.9.7d
dev-libs/openssl <= 0.9.7c == 0.9.6m

Description
==========

1. 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 0.9.6l inclusive and from 0.9.7a to 0.9.7c inclusive are affected by this issue.

2. A flaw has been discovered 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 cipher suites and will therefore be unaffected. Versions 0.9.7a, 0.9.7b, and 0.9.7c of OpenSSL are affected by this issue.

3. 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 to a fix that was added to OpenSSL 0.9.6d some time ago. This issue will affect vendors that ship older versions of OpenSSL with backported security patches.

Impact
=====

Although there are no public exploits known for bug, users are recommended to upgrade to ensure the security of their infrastructure.

Workaround
=========

There is no immediate workaround; a software upgrade is required. The vulnerable function in the code has been rewritten.

Resolution
=========

All users are recommened to upgrade openssl to either 0.9.7d or 0.9.6m:

# emerge sync
# emerge -pv ">=dev-libs/openssl-0.9.7d"
# emerge ">=dev-libs/openssl-0.9.7d"

Concerns?
========

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.


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