GLSA 200403-03: Multiple OpenSSL Vulnerabilities

http://security.gentoo.org/

Severity:	normal
Title:	Multiple OpenSSL Vulnerabilities
Date:	03/17/2004
Bugs:	#44941
ID:	200403-03

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

Package	Vulnerable	Unaffected	Architecture(s)
dev-libs/openssl	<= 0.9.7c	>= 0.9.7d	All supported architectures

Description

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.
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.
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"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200403-03.xml

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 https://bugs.gentoo.org.