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TITLE:
Mozilla Firefox Download Dialog Spoofing Vulnerabilities

SECUNIA ADVISORY ID:
SA12979

VERIFY ADVISORY:
http://secunia.com/advisories/12979/

CRITICAL:
Moderately critical

IMPACT:
Spoofing

WHERE:
>From remote

SOFTWARE:
Mozilla Firefox 1.x
http://secunia.com/product/4227/
Mozilla Firefox 0.x
http://secunia.com/product/3256/

DESCRIPTION:
Secunia Research has discovered two vulnerabilities in Mozilla
Firefox, which can be exploited by malicious people to spoof file
types in the file download dialog.

1) The filename and the "Content-Type" header are not sufficiently
validated before being displayed in the file download dialog. This
can be exploited to spoof file types in the file download dialog by
sending specially crafted headers containing white spaces, dots, and
ASCII bytes 160.

Successful exploitation may trick a user into executing malware if
the file is opened through the file download dialog.

The vulnerability has been confirmed in Mozilla Firefox 0.10.1 for
Windows. Other versions may also be affected.

2) The "Content-Type" header is used for associating a file to a file
type in the file download dialog, but the file extension is left
intact when saving the file to disk with "Save to Disk". This can be
exploited to spoof file types in the file download dialog.

Successful exploitation may result in malware being saved to the
download directory, which by default is the desktop.

NOTE: If the downloaded malware is a shortcut or some executable
file, then the icon can be spoofed in the download manager and on the
desktop.

The vulnerability has been confirmed in Mozilla Firefox 1.0 for
Windows. Other versions may also be affected.

SOLUTION:
The vulnerabilities have been partially fixed in version 1.0.1.

PROVIDED AND/OR DISCOVERED BY:
Andreas Sandblad, Secunia Research.

ORIGINAL ADVISORY:
Secunia Research:
http://secunia.com/secunia_research/2004-11/advisory/

OTHER REFERENCES:
1) https://bugzilla.mozilla.org/show_bug.cgi?id=267122
2) https://bugzilla.mozilla.org/show_bug.cgi?id=267123
https://bugzilla.mozilla.org/show_bug.cgi?id=275441

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About:
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