Several vulnerabilities exist in the Oracle Database Server and Listener. According the the Oracle Security Alert, exploitation of these vulnerabilities would require the attacker to have network access, but not a valid user account on the vulnerable system.
Oracle Database 10g Release 1 version 10.1.0.2, Oracle9i Database Server Release 2 versions 220.127.116.11 and 18.104.22.168, Oracle9i Database Server Release 1 versions 22.214.171.124, 126.96.36.199 and 9.0.4, and Oracle8i Database Server Release 3 version 188.8.131.52 contain multiple vulnerabilities in the in the Database Server and Listener. In order to exploit these vulnerabilities an attacker would need to have network access to the vulnerable systems.
The complete impact of this vulnerabilities is not clear. Oracle has rated this issue as High. For more information about Oracle's severity ratings please see:
Apply the appropriate patch or upgrade as specified in the Oracle Security Alert #68 (pdf).