Oracle9iAS Web Cache Denial of Service (a102802-1)

From: @stake advisories (@stake)
Date: 10/28/02

From: "@stake advisories" <>
To: <>
Date: Mon, 28 Oct 2002 14:05:57 -0500

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                               @stake, Inc.

                            Security Advisory

Advisory Name: Oracle9iAS Web Cache Denial of Service
 Release Date: 10-28-2002
  Application: Oracle9iAS Web Cache
     Platform: Windows NT/2000/XP
     Severity: Remote anonymous DoS
       Author: Andreas Junestam (
Vendor Status: Oracle has released a bulletin
CVE Candidate: CAN-2002-0386


Oracle Web Cache is a part of the Oracle Application Server suite. The
Web Cache server is designed to be implemented in front of the Oracle
Web server and act as a caching reverse proxy server.

There exists two different denial of service scenarios, which will cause
the Web Cache service to fail. The denial of service conditions can be
exploited by simple HTTP requests to the Web Cache service.

Detailed Description:

There exists two different denial of service situations in Oracle Web
Cache The first one is triggered by issuing a HTTP GET
request containing at least one dot-dot-slash contained in the URI:

GET /../ HTTP/1.0
Host: whatever

The second denial of service is triggered by issuing an malformed GET

GET / HTTP/1.0
Host: whatever
Transfer-Encoding: chunked

Both will create an exception and the service will fail.

Vendor Response:

Vendor was first contacted by @stake: 08-28-2002.
Vendor released a bulletin: 10-04-2002

Oracle has released a bulletin describing a solution to this issue.


Follow the vendor's instructions detailed in the security bulletin for
this issue.

- - From the Oracle bulletin:

  Customers should follow best security practices for protecting the
  administration process from unauthorized users and requests. As such,
  Oracle strongly encourages customers to take both of the following
  protective measures:
  1. Use firewall techniques to restrict access to the Web Cache
     administration port.
  2. Use the “Secure Subnets” feature of the Web Cache Manager tool to
     provide access only to administrators connecting from a list of
     permitted IP addresses or subnets.
  The potential security vulnerability is being tracked internally at
  Oracle and will be fixed by default in the 9.0.4 release of Oracle9i
  Application Server.

  For more information, see:

Common Vulnerabilities and Exposures (CVE) Information:

CAN-2002-0386 Oracle9iAS Web Cache Denial of Service

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