Unspecified vulnerability in the Upgrade/Downgrade component of Oracle Database 9.0.1.5 and 9.2.0.7 has unknown impact and attack vectors, aka DB13. NOTE: as of 20070424, Oracle has not disputed reliable claims that this is a buffer overflow involving the "mig utility."
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.red-database-security.com/advisory/oracle_cpu_apr_2007.html
http://www.oracle.com/technetwork/topics/security/cpuapr2007-090632.html
http://www.ngssoftware.com/research/papers/NGSSoftware-OracleCPUAPR2007.pdf
http://www.integrigy.com/security-resources/analysis/Integrigy_Oracle_CPU_April_2007_Analysis.pdf