Home / mailings [gentoo-announce] [ GLSA 200902-02 ] OpenSSL: Certificate validation error
Posted on 12 February 2009
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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@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
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