__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN RSA Signature Forgery (variant) [Mozilla Foundation Security Advisory 2006-66] November 8, 2006 19:00 GMT Number R-033 [REVISED 9 NOV 2006] [REVISED 4 Dec 2006] [REIVSED 5 Mar 2007] ______________________________________________________________________________ PROBLEM: RSA digital signatures with a low exponent (typically 3) could be forged. PLATFORM: Firefox 1.5.0.7 Thunderbird 1.5.0.7 SeaMonkey 1.0.5 Red Hat Desktop (v. 3 & v. 4), Red Hat Enterprise Linux AS, ES, WS (v. 2.1, v. 3, & v. 4) Red Hat Linux Advanced Workstation 2.1 for the Itanium Processor Firefox prior to version 1.5.0.9 running on HP-UX B.11.11 and B.11.23 Debian GNU/Linux 3.1 alias sarge DAMAGE: May allow an attacker to forge RSA signatures. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. May allow an attacker to forge RSA ASSESSMENT: signatures. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-033.shtml ORIGINAL BULLETIN: Mozilla Foundation Security Advisory 2006-66 http://www.mozilla.org/security/announce/2006/mfsa2006-66.html ADDITIONAL LINKS: Red Hat RHSA-2006:0733-4 https://rhn.redhat.com/errata/RHSA-2006-0733.html Red Hat RHSA-2006:0734-5 https://rhn.redhat.com/errata/RHSA-2006-0734.html Red Hat RHSA-2006:0735-4 https://rhn.redhat.com/errata/RHSA-2006-0735.html Debian Security Advisory 1224-1 http://www.debian.org/security/2006/dsa-1224 Debian Security Advisory 1225-2 http://www.debian.org/security/2006/dsa-1225 Debian Security Advisory 1227-1 http://www.debian.org/security/2006/dsa-1227 Visit Hewlett-Packard's Subscription Service for: HPSBUX02153 SSRT061181 rev. 3 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2006-5462 ______________________________________________________________________________ REVISION HISTORY: 11/09/2006 - revised to add links to Red Hat RHSA-2006:0733-4, RHSA-2006:0734-5, and RHSA-2006:0735-4 for Red Hat Desktop (v. 3 & v. 4), Red Hat Enterprise Linux AS, ES, WS (v. 2.1, v. 3, & v. 4), and for Red Hat Linux Advanced Workstation 2.1 for the Itanium Processor. 12/04/2006 - revised to add a link to Debian Security Advisories DSA-1224-1, DSA-1225-2, and DSA-1227-1 for Debian GNU/Linux 3.1 alias sarge. 03/05/2007 - revised R-033 to add a link to Hewlett-Packard HPSBUX02153 SSRT061181 rev. 3 for Firefox prior to version 1.5.0.9 running on HP-UX B.11.11 and B.11.23. [***** Start Mozilla Foundation Security Advisory 2006-66 *****] Mozilla Foundation Security Advisory 2006-66 Title: RSA Signature Forgery (variant) Impact: Critical Announced: November 7, 2006 Reporter: Ulrich Kuehn Products: Firefox, Thunderbird, SeaMonkey Fixed in: Firefox 1.5.0.8 Thunderbird 1.5.0.8 SeaMonkey 1.0.6 Description MFSA 2006-60 reported that RSA digital signatures with a low exponent (typically 3) could be forged. This flaw was corrected in the Mozilla Network Security Services (NSS) library version 3.11.3 used by Firefox 2.0 and current development versions of Mozilla clients. Ulrich Kuehn reported that Firefox 1.5.0.7, which incorporated NSS version 3.10.2, was incompletely patched and remained vulnerable to a variant of this attack. Workaround None, upgrade to a fixed version. References https://bugzilla.mozilla.org/show_bug.cgi?id=356215 CVE-2006-5462 MFSA 2006-60 -------------------------------------------------------------------------------- [***** End Mozilla Foundation Security Advisory 2006-66 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Mozilla for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. 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A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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