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                     National Cyber Alert System

               Technical Cyber Security Alert TA06-354A


Mozilla Addresses Multiple Vulnerabilities

   Original release date: December 20, 2006
   Last revised: --
   Source: US-CERT


Systems Affected

     * Mozilla Firefox
     * Mozilla Thunderbird
     * Mozilla SeaMonkey
     * Netscape Browser

   Other products based on Mozilla components may also be affected.


Overview

   The  Mozilla  web  browser  and derived  products  contain  several
   vulnerabilities,  the most  severe of  which could  allow  a remote
   attacker to execute arbitrary code on an affected system.


I. Description

   Mozilla  has released  new  versions of  Firefox, Thunderbird,  and
   SeaMonkey to address several vulnerabilities. Further details about
   these   vulnerabilities  are   available  from   Mozilla   and  the
   Vulnerability  Notes  Database.  An  attacker could  exploit  these
   vulnerabilities by  convincing a  user to view  a specially-crafted
   HTML document, such as a web page or HTML email message.


II. Impact

   While the impacts of  the individual vulnerabilities vary, the most
   severe could  allow a  remote, unauthenticated attacker  to execute
   arbitrary code on a vulnerable system. An attacker may also be able
   to cause a denial of service.


III. Solution

Upgrade

   These  vulnerabilities are  addressed in  Mozilla  Firefox 1.5.0.9,
   Mozilla Firefox 2.0.0.1, Mozilla Thunderbird 1.5.0.9, and SeaMonkey
   1.0.7. Mozilla  Firefox, Thunderbird,  and  SeaMonkey automatically
   check for updates by default.

   Support   for  Firefox   1.5   is  scheduled   to   end  in   April
   2007. 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.

Disable JavaScript and Java

   These vulnerabilities can be  mitigated by disabling JavaScript and
   Java. For  more information  about configuring Firefox,  please see
   the "Securing Your Web Browser" document. Netscape users should see
   the  "Site Controls"  document for  details.   Thunderbird disables
   JavaScript and Java by default.


IV. References

     * US-CERT Vulnerability Notes -
       <http://www.kb.cert.org/vuls/byid?searchview&query=mozilla_2006121
       9>

     * Securing Your Web Browser -
       <http://www.us-cert.gov/reading_room/securing_browser/browser_secu
       rity.html#Mozilla_Firefox>

     * Mozilla Foundation Security Advisories -
       <http://www.mozilla.org/security/announce/>

     * Known Vulnerabilities in Mozilla Products -
       <http://www.mozilla.org/projects/security/known-vulnerabilities.ht
       ml>

     * Mozilla Hall of Fame -
       <http://www.mozilla.org/university/HOF.html>

     * Site Controls -
       <http://browser.netscape.com/ns8/help/options-site.jsp>


 ____________________________________________________________________

   The most recent version of this document can be found at:

     <http://www.us-cert.gov/cas/techalerts/TA06-354A.html>
 ____________________________________________________________________

   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA06-354A Feedback VU#606260" in the
   subject.
 ____________________________________________________________________

   For instructions on subscribing to or unsubscribing from this
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   Produced 2006 by US-CERT, a government organization.

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     <http://www.us-cert.gov/legal.html>
 ____________________________________________________________________


Revision History

   December 20, 2006: Initial release

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