oracle program in Oracle 8.0.x, 8.1.x and 9.0.1 allows local users to overwrite arbitrary files via a symlink attack on an Oracle log trace (.trc) file that is created in an alternate home directory identified by the ORACLE_HOME environment variable.
http://www.securityfocus.com/bid/3135
http://otn.oracle.com/deploy/security/pdf/oracle_race.pdf