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Problems with the Oracle Critical Patch Update for April 2005
From: "David Litchfield" <davidl () ngssoftware com>
Date: Thu, 7 Jul 2005 17:13:29 +0100

Hey all,
Whilst analyzing Oracle's Critical Patch Update for April 2005 I noticed some failures in it, that meant certain issues the patch was supposed to fix were actually left unfixed.

One set of vulnerabilities "fixed" by the April CPU is a group of SQL injection bugs in DBMS_SUBSCRIBE and DBMS_ISUBSCRIBE discovered by AppSec Inc. On digging deeper you find that the actual source of the problem lies within the underlying java class files. The April CPU fails to properly load the newer patched classes which means that these problems can still be exploited. To resolve this problem, a DBA can use the loadjava command line utility or execute the loadjava procedure on the DBMS_JAVA package. The jar file to be loaded is $ORACLE_HOME/rdbms/jlib/CDC.jar. All platforms are affected by this problem.

On Windows, both 32bit and 64bit, a second problem exists; a vulnerability exists whereby an attacker can run arbitrary SQL by abusing the CTXSYS.DRILOAD package to gain DBA privleges. This was discovered by multiple persons and was initially fixed in August 2004. However, the April Critical Patch Update copies the updated sql script file to the wrong directory and if previous patches (August 2004 or January 2005) have not applied then you will still be vulnerable to this attack even if the April CPU has been applied.

These problems were reported to Oracle in early June and today they have released updated information about these problems. See the Metalink (http://metalink.oracle.com) website for more details.

<shameless plug>
I'll be speaking about patching and Oracle as part of my presentation at Blackhat in Las Vegas and the end of this month if anyone's interested
</shameless plug>

<shameful plug>
NGSSQuirreL for Oracle (http://www.ngssoftware.com/squirrelora.htm) checks for the problems I've just discussed
</shameful plug>

David Litchfield
NGSSoftware Ltd

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