Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                  ESB-2005.0373 -- UNIRAS Brief - 362/05
                    Two Mozilla Firefox Vulnerabilities
                                10 May 2005


        AusCERT Security Bulletin Summary

Product:           Mozilla Firefox 1.0.3 and prior
Publisher:         UNIRAS
Operating System:  BSD variants
                   Linux variants
                   Mac OS X
                   UNIX variants
Impact:            Execute Arbitrary Code/Commands
                   Cross-site Scripting
Access:            Remote/Unauthenticated

Original Bulletin: 

Comment: While no official Mozilla patch exists for these vulnerabilities,
         AusCERT recommends that users uncheck the "Enable JavaScript" and
         "Allow web sites to install software" checkboxes from the "Web
         Features" options menu.

- --------------------------BEGIN INCLUDED TEXT--------------------

- -----------------------------------------------------------------------------------
   UNIRAS (UK Govt CERT) Briefing Notice - 362/05 dated 09.05.05  Time: 16:05  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
- ----------------------------------------------------------------------------------- 
  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
- -----------------------------------------------------------------------------------

Two Mozilla Firefox Vulnerabilities


UNIRAS have been made aware of two vulnerabilities in Mozilla Firefox. Proof of concept
code is publicly available.  As the issue is still developing, you may wish to visit the 
following pages for up to date information:

"Security Advisory (May 8, 2005) The Mozilla Foundation is aware of two potentially critical 
Firefox security vulnerabilities as reported publicly Saturday, May 7th. There are currently 
no known active exploits of these vulnerabilities although a "proof of concept" has been
reported. Changes to the Mozilla Update web service have been made to mitigate the risk of 
an exploit. Mozilla is aggressively working to provide a more comprehensive solution to 
these potential vulnerabilities and will provide that solution in a forthcoming security 
update. Users can further protect themselves today by temporarily disabling JavaScript or 
disabling "Allow web sites to install software" option in Tools > Options > Web Features."


Rating: Extremely Critical (5/5)
"Two vulnerabilities have been discovered in Firefox, which can be exploited by malicious 
people to conduct cross-site scripting attacks and compromise a user's system."

"The vulnerabilities have been confirmed in version 1.0.3. Other versions may also be 


UNIRAS are continuing to monitor the situation, and will provide additional 
information as and when it becomes available.

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.

Comment: http://www.auscert.org.au/render.html?it=1967