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Vulnerability Note VU#335392

The Mozilla Network Security Services library fails to properly verify RSA signatures

Overview

The Mozilla Network Security Services library fails to properly verify RSA signatures. This vulnerability may allow an attacker to forge RSA signatures.

I. Description

RSA signatures are used to authenticate the source of a message. To prevent RSA signatures from being forged, messages are padded with data to ensure message hashes are adequately sized. The Mozilla Network Security Services (NSS) library fails to properly verify the padding in RSA signatures, ignoring data at the end of a signature. If this data is ignored and an RSA key with a public exponent of three is used, it may be possible to forge the signing key's signature.

For more information refer to Mozilla Foundation Security Advisory 2006-66.

This vulnerability may affect any application that uses the Mozilla NSS librbary, including SSL/TLS and email certificates.

II. Impact

This vulnerability may allow an attacker to forge an RSA signature.

III. Solution

Apply an update

According to the Mozilla Foundation Security Advisory 2006-66, this vulnerability is addressed in Firefox 1.5.0.8, Thunderbird 1.5.0.8, and SeaMonkey 1.0.6.

Note that according to Mozilla:

    Firefox 1.5.0.x will be maintained with security and stability updates until April 24, 2007. All users are strongly encouraged to upgrade to Firefox 2.

Systems Affected
VendorStatusDate Updated
Apple Computer, Inc.Vulnerable8-Jan-2007
Blue Coat SystemsVulnerable8-Jan-2007
MozillaVulnerable8-Nov-2006
RSA Security, Inc.Vulnerable18-Dec-2006
SybaseVulnerable8-Jan-2007

References

http://www.kb.cert.org/vuls/id/845620
http://www.mozilla.org/security/announce/2006/mfsa2006-60.html
http://www.mozilla.org/security/announce/2006/mfsa2006-66.html
https://bugzilla.mozilla.org/show_bug.cgi?id=356215
http://secunia.com/advisories/22929/
http://secunia.com/advisories/22980/
http://secunia.com/advisories/23013/
http://secunia.com/advisories/22763/
http://secunia.com/advisories/23009/
http://secunia.com/advisories/22815/
http://secunia.com/advisories/22727/
http://secunia.com/advisories/22770/
http://secunia.com/advisories/22722/
http://secunia.com/advisories/23883/
http://www.securityfocus.com/bid/19849

Credit

This vulnerability was reported in Mozilla Foundation Security Advisory 2006-66. Mozilla credits Ulrich Kuehn for providing information concerning this issue.

This document was written by Chris Taschner.

Other Information

Date Public11/08/2006
Date First Published11/08/2006 10:33:25 AM
Date Last Updated01/23/2007
CERT Advisory 
CVE NameCVE-2006-5462
US-CERT Technical Alerts 
Metric7.56
Document Revision47

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