Date: Thu, 08 Apr 2004 15:06:01 EET
From: Ioannis Migadakis <jmig@...l.gr>
To: bugtraq@...urityfocus.com
Cc: jmig@...l.gr
Subject: Heap Overflow in Oracle 9iAS / 10g Application Server Web Cache





                        InAccess Networks
                     www.inaccessnetworks.com

                        Security Advisory





Advisory Name: Heap Overflow in Oracle 9iAS / 10g Application Server 
               Web Cache 
 Release Date: 8 April 2004
  Application: Oracle Web Cache - all versions except 9.0.4.0.0 for 
               Windows, AIX & Tru64 which already contain fixes
     Platform: All Oracle supported platforms - 
               Sun Solaris
               HP/UX
               HP Tru64
               IBM AIX
               Linux
               Windows
     Severity: Critical - Remote Code Execution
     Category: Heap Overflow 
 Exploitation: Remote
       Author: Ioannis Migadakis [jmig@...ccessnetworks.com]
                                 [jmig@...l.gr]
Vendor Status: Oracle has released Security Alert #66 and 
               patches are available for supported products. 
               See http://otn.oracle.com/deploy/security/alerts.htm

CVE Candidate: CAN-2004-0385                  
    Reference: www.inaccessnetworks.com/ian/services/secadv01.txt 




About Web Cache
---------------

>From Oracle's Web Site 

"Oracle Web Cache is the software industry's leading application 
acceleration solution. Designed for enterprise grid computing, OracleAS 
Web Cache leverages state-of-the-art caching and compression 
technologies  to optimize application performance and more efficiently 
utilize low-cost, existing hardware resources."



>From Oracle's 9iAS Web Cache - Technical FAQ 

"An integrated component of Oracle's application server infrastructure, 
Oracle9iAS Web Cache is an innovative content delivery solution 
designed  to accelerate dynamic Web-based applications and reduce 
hardware costs."


>From Oracle's Security Alert #66 Rev.1

"...a typical Core or Mid-Tier default installation of Oracle 
Application  Server includes Web Cache."






Vulnerability Summary
---------------------

A heap overflow vulnerability exists in Oracle Web Cache - all 
platforms. The vulnerability can be exploited remotely and the attacker
can execute code of his choice. Some firewalls may not protect against 
this vulnerability. Patches are available from Oracle's Web Site and 
should be applied immediately. The risk to exposure is high.






Vulnerability Details
---------------------

Web Cache application processes HTTP/HTTPS requests from clients and 
passes them to Oracle HTTP Server(s).  


        HTTP/HTTPS     -------------          ------------- 
 client ---------->    - Web Cache -  ----->  -HTTP Server-    
         Request       -------------          -------------
       

By default Web Cache listens for incoming connections on port 7777 for 
HTTP and 4443 for HTTPS. These ports are configured by the 
administrator of the system and in real world installations they become
the well known ports 80 and 443 and they are available through the 
firewall to all. 


A heap overflow condition exists in "webcached" process when an invalid
HTTP/HTTPS request is made. The overflow can be triggered by sending an
overly long header as the HTTP Request Method. From RFC 2616 valid 
values for the HTTP Request Method are GET, HEAD, POST, PUT, DELETE, 
TRACE, CONNECT.   


By supplying an HTTP Request Method header of 432 bytes long against 
a Windows based Web Cache installation the following exception is 
caused within ntdll.RtlAllocateHeap. 


77FCBF00   MOV DWORD PTR DS:[ESI], ECX
77FCBF02   MOV DWORD PTR DS:[ECX+4], ESI


ECX and ESI are overwritten with the attacker supplied values. By 
controlling the values of the registers ECX and ESI, it is possible to 
write an arbitrary dword to any address. It all comes to the WHERE - 
WHAT situation described in many security related documents. Also the
buffer is quite large - Oracle9iAS Web Cache uses 4 KB for the HTTP 
headers as default buffer size. Using different variations of the exploit 
technique it is possible to overwrite different CPU registers.


The vulnerability exists in all Oracle supported platforms. On Windows
the Web Cache is running under the Security Context of Local SYSTEM 
account and in a successful exploitation of the vulnerability, a full 
remote system compromise is possible. On Unix & Linux the Web Cache 
process normally is running as user ORACLE and in a successful 
exploitation of the vulnerability a complete compromise of the data 
may be possible.  


CERT has assigned VU#643985 for this vulnerability. 






HTTP/HTTPS Method Heap Overflow & Firewalls 
-------------------------------------------

This vulnerability can bypass a large number of firewalls, so a 
firewall can not be considered as a measure for protection against this
vulnerability.


If the firewall uses Statefull Packet Inspection / Packet filtering and
operates in layers 3 & 4 (e.g. it can understand the difference between
port 80 and 21 but not between HTTP GET and HTTP POST) then this 
firewall does not offer any protection against this vulnerability. 


If the firewall uses some proxy features operating in the -so called- 
"application" layer (7) (e.g. it can understand the difference between 
HTTP GET and HTTP POST)  then this firewall does offer protection 
against this vulnerability. 


The above are true for HTTP where a large number of HTTP proxies / 
firewalls exists. Unfortunately for HTTPS the majority of the firewalls
do not offer protection against this vulnerability since HTTPS is 
nothing more to them than TCP port 443. 


After all, Oracle in Security Alert #66 correctly says "Firewalls 
deployed  within a corporate Intranet or between a corporate Intranet 
and the Internet do not protect against these vulnerabilities." 






Credit
------

Discovery: Ioannis Migadakis a.k.a. JMIG






Vulnerability History
---------------------


    DATE                                INFO
-------------    ------------------------------------------------------
17 April 2003    Vulnerability Discovered
22 April 2003    Contacted CERT
23 April 2003    Contacted Oracle                 
23 April 2003    CERT Replied - Assign VU#643985
12 March 2004    Oracle Security Alert #66 Rev.1 Released                
 2 April 2004    Oracle Security Alert #66 Rev.2 Released with Credits
 8 April 2004    Public Advisory Released to 
                 bugtraq@...urityfocus.com 
                 vulnwatch@...nwatch.org
                 full-disclosure@...ts.netsys.com






About inAccess Networks
-----------------------
inAccess Networks designs broadband access systems for the converging
telecommunication market and operates an OEM Design and a Network
Design team. 
Network Design team works with Service Providers and Enterprise
customers for large scale network design, network optimization,
security and quality assurance.
     
                 




                     










-------------------------------------------------------------
http://www.mail.gr/ - Get Your Private Free Email Address!
http://www.ringtone.gr/ - Ringtones & Logos for your mobile!

Powered by blists - more mailing lists