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Gentoo Linux Security Advisory                           GLSA 200610-06
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Mozilla Network Security Service (NSS): RSA signature
            forgery
      Date: October 17, 2006
      Bugs: #148283
        ID: 200610-06

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Synopsis
========

NSS fails to properly validate PKCS #1 v1.5 signatures.

Background
==========

The Mozilla Network Security Service is a library implementing security
features like SSL v.2/v.3, TLS, PKCS #5, PKCS #7, PKCS #11, PKCS #12,
S/MIME and X.509 certificates.

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

    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  dev-libs/nss      < 3.11.3                              >= 3.11.3

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

Daniel Bleichenbacher discovered that it might be possible to forge
signatures signed by RSA keys with the exponent of 3. This affects a
number of RSA signature implementations, including Mozilla's NSS.

Impact
======

Since several Certificate Authorities (CAs) are using an exponent of 3
it might be possible for an attacker to create a key with a false CA
signature. This impacts any software using the NSS library, like the
Mozilla products Firefox, Thunderbird and Seamonkey.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All NSS users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/nss-3.11.3"

Note: As usual after updating a library, you should run
'revdep-rebuild' (from the app-portage/gentoolkit package) to ensure
that all applications linked to it are properly rebuilt.

References
==========

  [ 1 ] CVE-2006-4339
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4339
  [ 2 ] CVE-2006-4340
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4340

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

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

  http://security.gentoo.org/glsa/glsa-200610-06.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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