2 days ago I gave a presentation “Oracle 12c from the attackers perspective” at the DOAG SIG Security. I learned some interesting things, especially that a fix for the Oracle oradebug “disable auditing” problem is available since 9 months.
Oradebug allows to run OS commands and to enable/disable Oracle SYSDBA and normal auditing on the fly without leaving traces in the audit log. The fix for this problem is available in Oracle 22.214.171.124/126.96.36.199 and was backported to 188.8.131.52 using the patches 15805002, 15808245, 16177780.
By default the setting is not enabled in Oracle 184.108.40.206/12.1..0.1.
The undocumented parameter _fifteenth_spare_parameter (Oracle Description: fifteenth spare parameter – integer – Yeah, really useful) can now disable or limit the oradebug functionality. I could not find any information about this parameter on google or my oracle support.
—— extract from the read me.txt of the patch file——————
## _fifteenth_spare_parameter can be set to “all”, “restricted” or “none”
## “all” disables execution of all oradebug commands, “restricted” disables
## execution of restricted oradebug commands, “none” (default) allows execution
## of oradebug commands.
—— extract from the read me.txt ——————