full-disclosure - Yahoo Toolbar YShortcut.dll IsTaggedBM() Buffer Overflow

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Date: Wed, 19 Dec 2007 10:56:28 -0500 (EST)
From: Elazar Broad <elazarb@...thlink.net>
To: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>
Subject: Yahoo Toolbar YShortcut.dll IsTaggedBM() Buffer
	Overflow

YShortcut is a feature of the Yahoo toolbar which allows you to map shortcuts to URLS, i.e. y = http://www.yahoo.com and bla = http://www.somesite.com. The IsTaggedBM function is called every time anything is typed into the browsers address bar. This function suffers from an exploitable buffer overflow if 3000 characters is passed to it. Instead of doing their own bounds checking, Yahoo relies on the 2083 maximum URL length for Internet Explorer. This object is NOT marked safe for scripting.

YShortcut.dll, version 2006.8.15.1 
{67CE97C5-ABE6-429A-B6BD-3BD1333A0825}

Elazar

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