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                          Security Advisory

                Vulnerabilities in Oracle9iAS Web Cache
 
Author: Mark Rowe <mark.rowepentest-limited.com>
        Pete Finnigan <pete.finniganpentest-limited.com>
Date: 7th January 2002
Reference: ptl-2002-01

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Overview:

This advisory describes multiple vulnerabilities in Oracle9iAS Web Cache
that allow an attacker with local access to overwrite any files
accessible to "oracle" user, gain "oracle" user privileges and capture
the password of the Web Cache admin account.

Description:

It is possible for non privileged user to start Web Cache by invoking
$ORACLE_HOME/webcache/bin/webcached and either create or overwrite any
"oracle" owned file as the result of the setuid bit "oracle". By
starting $ORACLE_HOME/webcache/bin/webcached with the -A option it is
also possible to run commands as the "oracle" user. This can be achieved
by modification of local environment variables and Web Cache
configuration files.

As part of the functionality offered by Web Cache it is possible to
locally and remotely administer the Web Cache application. Normally,
access is restricted (a username and password are required). The Web
Cache administrator passwords are stored in $ORACLE_HOME/webcache/webcac
he.xml. This file is readable by world and contains the "encrypted"
password for the administrator accounts. The encryption was found to be
weak. It may also be possible to gain access to the administrator
accounts if the default passwords have not been changed.

Test Environment:

These vulnerabilities have been tested on Oracle 9iAS version 1.0.2.2.1
installed on Sun Solaris 2.8. Other versions may also be vulnerable.

Recommendations:

Apply vendor patches.

Vendor Status:

The vendor has issued a bulletin and made patches available on this
issue. See

http://otn.oracle.com/deploy/security/pdf/webcache2.pdf

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