September 2006

ID: 00667
Ref: 639/06
Date: 29 September 2006:15:15:25
Version: 1

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Title: Gentoo - Opera: RSA signature forgery [GLSA 200609-18]
Abstract: Opera fails to correctly verify certain signatures.
Vendors affected: Gentoo
Operating systems affected: Gentoo
Applications affected: Gentoo

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Title
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Gentoo - Opera: RSA signature forgery [GLSA 200609-18]


Detail
======

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Gentoo Linux Security Advisory GLSA 200609-18
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http://security.gentoo.org/
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Severity: Normal
Title: Opera: RSA signature forgery
Date: September 28, 2006
Bugs: #147838
ID: 200609-18

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Synopsis
========

Opera fails to correctly verify certain signatures.

Background
==========

Opera is a multi-platform web browser.

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

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Package / Vulnerable / Unaffected
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1 www-client/opera < 9.0.2 >= 9.0.2

Description
===========

Opera makes use of OpenSSL, which fails to correctly verify PKCS #1
v1.5 RSA signatures signed by a key with exponent 3. Some CAs in
Opera's list of trusted signers are using root certificates with
exponent 3.

Impact
======

An attacker could forge certificates which will appear valid and signed
by a trusted CA.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Opera users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-client/opera-9.0.2"

References
==========

[ 1 ] Opera Advisory
http://www.opera.com/support/search/supsearch.dml?index=845
[ 2 ] GLSA 200609-05
http://www.gentoo.org/security/en/glsa/glsa-200609-05.xml

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200609-18.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 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.