rogue SYS connections

From: Vordos, Suzy <Suzy.Vordos_at_qwest.com>
Date: Wed, 10 Dec 2003 12:09:33 -0800
Message-ID: <F001.005D9742.20031210120933@fatcity.com>

Solaris 2.8 Oracle 8.1.7.0. We have session auditing enabled, and see rogue connections as SYS from several remote databases. The os_user of the remote system is always oracle and there are several different remote hosts involved.

I can't figure out how they are gaining access this way. Our SYS password is set to a random string, not the default, and we change it frequently. There are no corresponding telnet sessions indicating access is local from our server, and we also change our oracle password frequently.

I know the listener has vulnerabilities and we should apply those patches, but want to be sure we don't have an obvious configuration problem that is allowing these connections. Any ideas?

init.ora remote_login_passwordfile=NONE remote_os_authent=FALSE
sqlnet.ora sqlnet.authentication_services=(NONE)

Here is a snippet from the audit trail:

sys.aud$ select timestamp#, userid, userhost, terminal, action# returncode, comment$text from sys.aud$ where userid = 'SYS';

DEC-09-03 15:13:10       SYS                         UNKNOWN               101

Authenticated by: DATABASE; Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.0.19 2.236)(PORT=63519))

dba_audit_session select username,os_username,action_name action,terminal,timestamp,returncode from dba_audit_session where username = 'SYS';

USERNAME OS_USERNAME ACTION TERMINAL TIMESTAMP RETURNCODE

-------- ------------ ------ -------------- ------------------ ----------
SYS      oracle       LOGOFF UNKNOWN        DEC-09-03 15:13:10          0

listener log 09-DEC-2003 15:13:10 * (CONNECT_DATA=(SID=mnet03bP)(CID=(PROGRAM=)(HOST=hpcad200)(USER=oracle))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.0.192.236)(PORT=63519)) * establish * mnet03bP * 0

Thanks,
Suzy
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Author: Vordos, Suzy
INET: Suzy.Vordos_at_qwest.com

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