Description:

Mozilla has published a security advisory to address a vulnerability found in Firefox. This vulnerability is caused by a problem that allows violation of the same origin policy to read local files. A remote attacker could entice a user to open a web page with specially crafted content to exploit the vulnerability.

Affected Systems:

• Firefox prior to version 39.0.3
• Firefox ESR 38.x prior to version 38.1.1

Impact:

A successful attack could lead to bypass of security restrictions and information disclosure.

Recommendation:

Mozilla has released new versions of the products to address the issue and they can be downloaded at the following URLs:

• Firefox 39.0.3 for Windows, Macintosh and Linux
  https://download.mozilla.org/?product=firefox-39.0.3-SSL&os=win
  https://download.mozilla.org/?product=firefox-39.0.3-SSL&os=osx
  https://download.mozilla.org/?product=firefox-39.0.3-SSL&os=linux
  
  
• Firefox ESR 38.1.1 for Windows, Macintosh and Linux
  https://download.mozilla.org/?product=firefox-38.1.1esr-SSL&os=win
  https://download.mozilla.org/?product=firefox-38.1.1esr-SSL&os=osx
  https://download.mozilla.org/?product=firefox-38.1.1esr-SSL&os=linux
  
  

Users of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk.

More Information:

https://www.mozilla.org/en-US/security/advisories/
https://www.mozilla.org/en-US/security/advisories/mfsa2015-78/
https://www.us-cert.gov/ncas/current-activity/2015/08/06/Mozilla-Releases-Security-Updates-Firefox-and-Firefox-ESR
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4495