The Oracle Discoverer servlet in Oracle Application Server 9.0.4.3, 10.1.2.0.2, and 10.1.2.2.0 allows remote attackers to shut down an Oracle TNS Listener via a TNS STOP command in a request that uses the database/TNS alias, aka AS01.
http://www.vupen.com/english/advisories/2007/1426
http://www.us-cert.gov/cas/techalerts/TA07-108A.html
http://www.securitytracker.com/id?1017927
http://www.securityfocus.com/bid/23532
http://www.securityfocus.com/archive/1/466329/100/200/threaded
http://www.securityfocus.com/archive/1/466160/100/0/threaded
http://www.red-database-security.com/advisory/oracle_discoverer_servlet.html
http://www.red-database-security.com/advisory/oracle_cpu_apr_2007.html
http://www.oracle.com/technetwork/topics/security/cpuapr2007-090632.html