[_FRG_]

This advisory was released more than one month ago. However, a lot of users are still running vulnerable Firefox versions. I have to warn them once again - update immediately! Vulnerabilities described in the advisory are very serious:

"Multiple vulnerabilities have been reported in Firefox, which can be exploited by malicious people to conduct spoofing attacks, manipulate certain data, bypass certain security restrictions, and compromise a user's system.

1) A boundary error in the processing of XBM images can be exploited to cause a heap based buffer overflow via a specially crafted image.

Successful exploitation allows execution of arbitrary code.

2) An error in the processing of Unicode sequences with "zero-width non-joiner" characters can be exploited to corrupt the stack and cause a crash.

Successful exploitation may allow execution of arbitrary code.

3) An input validation error in the processing of headers passed to the "XMLHttpRequest" object can be exploited to inject arbitrary HTTP requests.

4) An unspecified error where a XBL control which implements an internal interface can spoof DOM objects.

This is similar to vulnerability #8 in:
SA16043

5) An unspecified integer overflow error in the JavaScript engine can be exploited to execute arbitrary code.

6) The problem is that unprivileged "about:" pages can load privileged "chrome:" pages in certain situations.

This does not pose any security risk by it self, but can be exploited in combination with other cross-site scripting vulnerabilities to execute arbitrary code.

7) An error in the creation of windows can be exploited to open a new window without the address bar and status bar via a reference to a closed window.

Successful exploitation allows bypass of certain security mechanisms designed to protect against phishing attacks.

The vulnerabilities have been reported in version 1.0.6. Prior versions may also be affected."

DANGER: highly critical

SOLUTION: upgrade to Firefox 1.0.7