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

Vulnerability Note VU#335392

Original Release Date: 2006-11-08 | Last Revised: 2007-01-23

Overview

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

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.

Impact

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

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.

Vendor Information

335392
 
Affected   Unknown   Unaffected

Mozilla

Notified:  November 06, 2006 Updated:  November 08, 2006

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to http://www.mozilla.org/security/announce/2006/mfsa2006-66.html.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

RSA Security, Inc.

Updated:  December 18, 2006

Status

  Vulnerable

Vendor Statement

RSA BSAFE SSL-C software has been examined and confirmed to be susceptible to this vulnerability; customers should upgrade to RSA BSAFE SSL-C 2.7.1 which includes remediation for this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Acknowledgements

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

CVE IDs: CVE-2006-5462
Severity Metric: 7.56
Date Public: 2006-11-08
Date First Published: 2006-11-08
Date Last Updated: 2007-01-23 19:48 UTC
Document Revision: 47

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