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Gentoo Linux Security Advisory GLSA 200609-05
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http://security.gentoo.org/
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Severity: Normal
Title: OpenSSL, AMD64 x86 emulation base libraries: RSA signature
forgery
Date: September 07, 2006
Bugs: #146375, #146438
ID: 200609-05
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Synopsis
========
OpenSSL fails to properly validate PKCS #1 v1.5 signatures.
Background
==========
OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport
Layer Security protocols and a general-purpose cryptography library.
The x86 emulation base libraries for AMD64 contain a vulnerable version
of OpenSSL.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 openssl < 0.9.7k >= 0.9.7k
2 emul-x86-linux-baselibs < 2.5.2 >= 2.5.2
-------------------------------------------------------------------
# Package 2 [app-emulation/emul-x86-linux-baselibs] only applies
to AMD64 users.
NOTE: Any packages listed without architecture tags apply to all
architectures...
-------------------------------------------------------------------
2 affected packages
-------------------------------------------------------------------
Description
===========
Daniel Bleichenbacher discovered that it might be possible to forge
signatures signed by RSA keys with the exponent of 3.
Impact
======
Since several CAs are using an exponent of 3 it might be possible for
an attacker to create a key with a false CA signature.
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-0.9.7k"
All AMD64 x86 emulation base libraries users should upgrade to the
latest version:
# emerge --sync
# emerge --ask --oneshot --verbose
">=app-emulation/emul-x86-linux-baselibs-2.5.2"
References
==========
[ 1 ] CVE-2006-4339
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4339
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200609-05.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@xxxxxxxxxx or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2006 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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