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July 17, 2009 6:08 AM PDT

Security vulnerability found in Firefox 3.5; Update: fixed with 3.5.1

by CNET staff
Security specialists, Secunia, have released a highly critical advisory regarding a vulnerability in Mozilla's latest version of its popular Web browser, Firefox.

From Secunia:

"SBerry has discovered a vulnerability in Mozilla Firefox, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error when processing JavaScript code handling e.g. "font" HTML tags and can be exploited to cause a memory corruption.

Successful exploitation allows execution of arbitrary code.

The vulnerability is confirmed in version 3.5. Other versions may also be affected."

Possible solution
From Secunia:

"Solution: Set "javascript.options.jit.content" to "false" by opening about:config.

Do not browse untrusted websites or follow untrusted links."

As always, be sure to create stable backups of your data regularly. Expect to see a patch for this vulnerability in the next few days from Mozilla.

Resources
Read more about the Firefox vulnerability at Secunia's Web site.

UPDATE: A new version of Firefox (3.5.1) is available that addresses this vulnerability, and is recommended for all Firefox users.

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Resources

  • Secunia's Web site
  • Let us know!
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    Add a Comment (Log in or register)
    by gvibe06 July 18, 2009 6:49 AM PDT
    My Firefox went from fast to slow after the update. I'm watching "top" right now, this message is the only tab open in Firefox and I see a consistent 15-20% CPU usage. Plain old 3.5 opened up so much faster; 3.5.1 goes back to the 3.0.11 slow startup speeds.

    If someone considered themselves to be in the "<b>not easy to trick</b>" category, how big of a risk is it to go back to 3.5?
    Reply to this comment