[gentoo-announce] [ GLSA 200902-02 ] OpenSSL: Certificate validation error

[news 28]

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Gentoo Linux Security Advisory GLSA 200902-02

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http://security.gentoo.org/

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Severity: Normal

Title: OpenSSL: Certificate validation error

Date: February 12, 2009

Bugs: #251346

ID: 200902-02

 

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Synopsis

========

 

An error in the OpenSSL certificate chain validation might allow for

spoofing attacks.

 

Background

==========

 

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer

(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general

purpose cryptography library.

 

Affected packages

=================

 

-------------------------------------------------------------------

Package / Vulnerable / Unaffected

-------------------------------------------------------------------

1 dev-libs/openssl < 0.9.8j >= 0.9.8j

 

Description

===========

 

The Google Security Team reported that several functions incorrectly

check the result after calling the EVP_VerifyFinal() function, allowing

a malformed signature to be treated as a good signature rather than as

an error. This issue affects the signature checks on DSA and ECDSA keys

used with SSL/TLS.

 

Impact

======

 

A remote attacker could exploit this vulnerability and spoof arbitrary

names to conduct Man-In-The-Middle attacks and intercept sensitive

information.

 

Workaround

==========

 

There is no known workaround at this time.

 

Resolution

==========

 

All OpenSSL users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.8j"

 

References

==========

 

[ 1 ] CVE-2008-5077

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5077

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200902-02.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 ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

Copyright 2009 Gentoo Foundation, Inc; referenced text

belongs to its owner(s).

 

The contents of this document are licensed under the

Creative Commons - Attribution / Share Alike license.

 

http://creativecommons.org/licenses/by-sa/2.5