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AA-2008.0070                  AUSCERT Advisory

                             [Win][UNIX/Linux]
         Firefox 2.0.0.13 released fixing several vulnerabilities
                               26 March 2008
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        AusCERT Advisory Summary
        ------------------------

Product:              Firefox
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact:               Execute Arbitrary Code/Commands
                      Increased Privileges
                      Cross-site Scripting
                      Provide Misleading Information
                      Reduced Security
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-1241 CVE-2008-1240 CVE-2008-1238
                      CVE-2008-1236 CVE-2008-1235 CVE-2008-1234
                      CVE-2008-1233 CVE-2008-1195 CVE-2007-4879
Member content until: Wednesday, April 23 2008

OVERVIEW:

       Mozilla have release the latest version of Firefox, correcting
       several vulnerabilities ranging from cross-site scripting to the
       execution of arbitrary code.


IMPACT:

       The following vulnerabilities have been corrected in version 
       2.0.0.13:

       o MFSA-2008-19 (CVE-2008-1241) "It was possible to have a background 
         tab create a borderless XUL pop-up in front of the active tab in 
         the user's browser. This technique could be used by an attacker to 
         spoof form elements such as a login prompt for a site opened in a 
         different tab and steal the user's login credentials for that 
         site." [1]

       o MFSA-2008-18 (CVE-2008-1240, CVE-2008-1195) "Web content fetched 
         via the jar: protocol can use Java via LiveConnect to open socket 
         connections to arbitrary ports on the user's machine 
         ('localhost')." [2]

       o MFSA-2008-17 (CVE-2007-4879) "The default setting for SSL Client 
         Authentication, automatically selecting a client certificate on 
         behalf of the user, creates a potential privacy issue for users by 
         allowing tracking through client certificates." [3]

       o MFSA-2008-16 (CVE-2008-1238) "Security researcher Gregory Fleischer 
         demonstrated a problem with the HTTP Referer:(sic) header sent with 
         requests to URLs containing Basic Authentication credentials with 
         empty usernames. In these cases a number of leading characters, 
         based on the length of the password in the URL, are removed from the 
         referrer hostname. Fleischer pointed out that websites which only 
         check the Referer: header to protect against Cross-Site Request 
         Forgery (CSRF) could be attacked using this flaw." [4]

       o MFSA-2008-15 (CVE-2008-1237, CVE-2008-1236) "Mozilla developers 
         identified and fixed several stability bugs in the browser engine 
         used in Firefox and other Mozilla-based products. Some of these 
         crashes showed evidence of memory corruption under certain 
         circumstances and we presume that with enough effort at least some 
         of these could be exploited to run arbitrary code." [5]

       o MFSA-2008-14 (CVE-2008-1235, CVE-2008-1234, CVE-2008-1233) "Mozilla 
         contributors moz_bug_r_a4, Boris Zbarsky, and Johnny Stenback 
         reported a series of vulnerabilities which allow scripts from page 
         content to run with elevated privileges. moz_bug_r_a4 demonstrated 
         additional variants of MFSA 2007-25 and MFSA2007-35 (arbitrary code 
         execution through XPCNativeWrapper pollution). Additional 
         vulnerabilities reported separately by Boris Zbarsky, Johnny 
         Stenback, and moz_bug_r_a4 showed that the browser could be forced 
         to run JavaScript code using the wrong principal leading to 
         universal XSS and arbitrary code execution." [6]


MITIGATION:

       Users can protect themselves from these vulnerabilities by upgrading
       to Firefox 2.0.0.13 which is available for download from the Mozilla
       website [7].
   

REFERENCES:

       [1] Mozilla Foundation Security Advisory 2008-19
           http://www.mozilla.org/security/announce/2008/mfsa2008-19.html

       [2] Mozilla Foundation Security Advisory 2008-18
           http://www.mozilla.org/security/announce/2008/mfsa2008-18.html

       [3] Mozilla Foundation Security Advisory 2008-17
           http://www.mozilla.org/security/announce/2008/mfsa2008-17.html

       [4] Mozilla Foundation Security Advisory 2008-16
           http://www.mozilla.org/security/announce/2008/mfsa2008-16.html

       [5] Mozilla Foundation Security Advisory 2008-15
           http://www.mozilla.org/security/announce/2008/mfsa2008-15.html

       [6] Mozilla Foundation Security Advisory 2008-14
           http://www.mozilla.org/security/announce/2008/mfsa2008-14.html
 
       [7] Firefox Web Browser
           http://www.mozilla.com/en-US/firefox/
     
AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. 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.

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:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
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.
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