Vulnerability Note VU#169164
Oracle PL/SQL Gateway fails to properly validate HTTP requests
The Oracle PL/SQL Gateway fails to properly validate HTTP requests. This may allow a remote attacker to execute SQL commands on an Oracle database.
Oracle uses the Oracle PL/SQL Gateway to access Oracle databases over HTTP. A lack of validation in the Oracle PL/SQL Gateway may allow a remote attacker to bypass Oracle's security restrictions and gain access to critical packages and procedures. The Oracle PL/SQL Gateway uses a list of keywords to restrict access to powerful packages and procedures. Upon receiving a request to execute a procedure, the PL/SQL Gateway compares the request to the list to determine if that procedure attempts to access any restricted procedures or packages. However, a remote attacker may be able to bypass this check by sending a specially crafted HTTP request to the Oracle PL/SQL Gateway.
Note that all Oracle installations with the HTTP Server (Apache) enabled may be affected by this vulnerability. For more information see Oracle Metalink Note 311536.1.
If a remote attacker sends a specially crafted HTTP request to a vulnerable Oracle installation, that attacker may be able to execute SQL commands with elevated privileges.
Apply a patch
Set always_describe or PlsqlAlwaysDescribeProcedure parameters to ON
If PlsqlAlwaysDescribeProcedure is enabled, Oracle tries to describe every PL/SQL procedure. If a hacker injects pl/sql code, Oracle tries to describe this specially crafted string but fails because this procedure does not exist.
As a general rule, disable or remove any nonessential software. In this case, the Oracle HTTP Server (Apache) should be disabled on any Oracle installations that do need to be accessible via HTTP.
Limit Access to HTTP Server
You may wish to block access to the vulnerable software from outside your network perimeter, specifically by blocking access to the ports used by the Apache HTTP server (typically 80/tcp). This will limit your exposure to attacks. However, blocking at the network perimeter would still allow attackers within the perimeter of your network to exploit the vulnerability. The use of host-based firewalls in addition to network-based firewalls can help restrict access to specific hosts within the network. It is important to understand your network's configuration and service requirements before deciding what changes are appropriate.
Systems Affected (Learn More)
|Vendor||Status||Date Notified||Date Updated|
|Oracle Corporation||Affected||-||19 Apr 2006|
CVSS Metrics (Learn More)
This vulnerability was reported by David Litchfield of NGSSoftware. Information used in this document came from Integrigy, Alexander Kornbrust of red-database security, and Vladimir Zakharychev of Webrecruiter.
This document was written by Jeff Gennari.
- CVE IDs: CVE-2006-0435
- Date Public: 25 Jan 2006
- Date First Published: 27 Jan 2006
- Date Last Updated: 19 Apr 2006
- Severity Metric: 21.37
- Document Revision: 81
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