January 2007
Intermediate to advanced
190 pages
3h 47m
English
Content preview from The Oracle® Hacker's Handbook: Hacking and Defending Oracle
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8.3. General Privileges
I've seen a number of servers that have granted PUBLIC the execute permission of DBMS_RLS, and several tutorials on virtual private databases that do the same. This is not a good idea. There are also other packages that should have the execute permission for PUBLIC, such as SYS.LTADM, which has a procedure called CREATERLSPOLICY that directly calls the DBMS_RLS.ADD_POLICY procedure. DBMS_FGA is clearly another. WK_ADM, owned by WKSYS, is executable by PUBLIC and allows limited modification of policies.
Lastly, if someone can grant themselves the EXEMPT ACCESS POLICY system privilege — for example, via a SQL injection flaw — then policies will not apply to them.
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