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TUCoPS :: Windows :: bt781.txt

RAV ActiveX Buffer overflow in ravupdt.dll file





RAV Online Scanning ActiveX Buffer Overflow in RAVUPDT.DLL
=================================================

PROGRAM: RAV ONLINE SCANNING ACTIVEX
HOMEPAGE:  www.ravantivirus.com
VULNERABLE VERSIONS: Online Version Only


DESCRIPTION
=================================================

RAV Online Scanning is a free antivirus scanner for internet users. It is
run on the user's browsers as an ActiveX.

DETAILS
=================================================

The ActiveX uses a file called RAVUDPT.DLL to handle networking functions.
In the main ActiveX file (RAVONLINE.DLL) there is a function named
update(serveraddr as string) with serveraddr is the ftp or http address of
the
database to update. However if update() is passed with a
long string, then when the long string is parsed into RAVUDPT.DLL, it will
cause a buffer overflow.


WORKAROUND
=================================================

Delete the old ActiveX(rav*.dll) in the "Downloaded Program Files" in
your Windows Directory. Vendor already got noticed but no response yet.

CREDITS
=================================================

Discovered by Tri Huynh from Sentry Union


DISLAIMER
=================================================

The information within this paper may change without notice. Use of
this information constitutes acceptance for use in an AS IS condition.
There are NO warranties with regard to this information. In no event
shall the author be liable for any damages whatsoever arising out of
or in connection with the use or spread of this information. Any use
of this information is at the user's own risk.


FEEDBACK
=================================================

Please send suggestions, updates, and comments to: trihuynh@zeeup.com


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