Firefox Fixes IE Flaws


Mozilla has updated its flagship Firefox browser to version 2.0.0.5 with at least nine security issues fixed.

Among them is one for an issue that was trigged when user also had
Microsoft’s Internet Explorer installed as well. Remote code execution by
launching Firefox from Internet Explorer is addressed by Mozilla Security
Advisory 2007-23.

The flaw was first
reported on July 10. It involves the “firefoxurl://” uniform resource identifier (URI) handler, which enables Firefox to call on other Web resources.


Though Mozilla has fixed the flaw in Firefox 2.0.0.5, Mozilla’s advisory
noted that other Windows applications can be called in a similar way and
also manipulated to execute malicious code.


“This fix only prevents Firefox and Thunderbird from accepting bad data,”
Mozilla stated in its advisory. “This patch does not fix the vulnerability
in Internet Explorer.”


Other critical bugs fixed include the following:

  • Mozilla Foundation Security Advisory
    2007-18, which fixes crashes with evidence of memory corruption;

  • Mozilla
    Foundation Security Advisory 2007-23, which describes a Privilege escalation
    using an event handler attached to an element not in the document;

  • Mozilla Foundation Security Advisory 2007-19, which fixes a bug rated as High by
    Mozilla. It’s a potential cross site scripting risk where scripts could be
    injected into another site’s context by exploiting a timing issue.

  • Timing is also responsible for a low risk vulnerability addressed in Mozilla
    Foundation Security Advisory 2007-20 that could allow for Frame spoofing
    while a window is loading. According to Mozilla’s advisory a pair of
    security researchers reported that it was possible to exploit a timing issue
    to inject content into about:blank frames in a page. “When opening a window
    from a script, it is possible to spoof the content of the newly opened
    window’s frames within a short time frame, while the window is loading,” the
    advisory states.


    The Firefox 2.0.05 release follows the 2.0.0.4
    release
    by almost two months. Mozilla has not updated its Firefox 1.5.x
    series as part of this release update. Firefox 1.5.x was retired in May.

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