[Full-disclosure] [ GLSA 200609-18 ] Opera: RSA signature forgery

[Matthias Geerdsen]

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

    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  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 at 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.

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

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