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                   Defcom Labs Advisory def-2001-30

   Oracle9iAS Web Cache/2.0.0.1.0 Multiple DoS and Buffer Overflow

Authors: George Hedfors <george.hedfors@defcom.com>
         Andreas Junestam <andreas.junestam@defcom.com>
Release Date: 2001-10-18
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------------------------=[Brief Description]=-------------------------
Release 2.0.0.1.0 and perhaps even previous releases, contain a URL 
driven buffer overrun condition which either can cause process exiting,
process hanging or injection of malicious code.

------------------------=[Affected Systems]=--------------------------
Oracle9iAS Web Cache/2.0.0.1.0 on all supported platforms.

----------------------=[Detailed Description]=------------------------
A simple URL driven denial of service or buffer overflow condition 
occurs when a very long text string is sent to the web service. 
This occurs on all four web services that the Oracle9iAS Web Cache 
software provides. The four services are by default run on: Port 1100 =
Incoming web cache proxy. Port 4000 = Administrative interface. Port
4001 = Web XML invalidation port. Port 4002 = Statistics port.

* Buffer overflow condition:
  When sending a request containing / + 'A' x 3095 + 'N' x 4, the
  process terminates with the with the following state dump:

  <....snip>
  State Dump for Thread Id 0x104

  eax=00000c1d ebx=00000000 ecx=00000c1d edx=026f0041
  esi=01baac86 edi=0040deb6
  eip=4e4e4e4e esp=0632fe08 ebp=41414141 iopl=0
  cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000            
  efl=00000216
  <snip....>


* Denial of service:
  Upon sending a string longer then 3570 characters, the process
  simply exists without stack dump:
  'GET /<3571 x A> HTTP/1.0'

  The following three denial of service attacks result in the process
  hanging and the CPU usage of 100% and a reboot is required in order
  to terminate the hanging processes. 

  - When sending a string containing approximately 3094 characters.

  - When sending more aproximatly 4000 characters in the HTTP header.
    User-Agent is one of the verified headers where this condition
    exists.
    'GET / HTTP/1.0'
    'User-Agent: <4000 x A>'

  - Sending the following request (this only affects the webcache
    admin interface):
    'GET /. HTTP/1.0'

---------------------------=[Workaround]=-----------------------------
Download patch from Oracle's support website, https://metalink.oracle.com

NT/WIN2K:
Patch number 2044682

SUN Sparc Solaris:
Patch number 2042106

HP-UX:
Patch number 2043908

Linux:
Patch number 2043924

Compaq Tru64 Unix:
Patch number 2043921

IBM AIX:
Patch number 2043917

-----------------------------=[Exploit]=------------------------------
For NT/WIN2K, see attached file, webcache.pl

-------------------------=[Vendor Response]=--------------------------
Vendor was notified on 2001-09-17. Patch is released.

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