TUCoPS :: Browsers :: b06-4957.htm

Opera: RSA signature forgery

Better a bottle in front of me than a frontal lobotomy.

Opera: RSA signature forgery
Opera: RSA signature forgery



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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@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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