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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
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Opera fails to correctly verify certain signatures.

Background
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Opera is a multi-platform web browser.

Affected packages
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    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  www-client/opera       < 9.0.2                           >=3D 9.0.2

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

Workaround
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There is no known workaround at this time.

Resolution
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All Opera users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=3Dwww-client/opera-9.0.2"

References
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  [ 1 ] Opera Advisory
        http://www.opera.com/support/search/supsearch.dml?index=3D845
  [ 2 ] GLSA 200609-05
        http://www.gentoo.org/security/en/glsa/glsa-200609-05.xml

Availability
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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?
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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
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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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