受影响系统:
Oracle Database 10gR1
描述:
Oracle是一款大型的商业数据库系统。
Oracle的DBMS_SNAPSHOT_UTL软件包可治理具体的视图。这个软件包中的公开过程VERIFY_LOG中存在缓冲区溢出漏洞,成功的攻击可导致执行任意代码或拒绝服务。
默认下DBMS_SNAPSHOT_UTL对PUBLIC具有EXECUTE权限,因此任何Oracle数据库用户都可以利用这个漏洞。请注重尽管2006年4月的紧急补丁更新提到了这个bug,但Oracle仍没有为大多数平台发布补丁。
<*来源:Esteban Martínez Fayó (secemf@gmail.com)
链接:http://marc.theaimsgroup.com/?l=bugtraq&m=114557615729202&w=2
http://www.us-cert.gov/cas/techalerts/TA06-109A.Html
http://www.oracle.com/technology/deploy/security/pdf/cpuapr2006.html?
_template=/ocom/technology/cont
*>
>
建议:
临时解决方法:
* 限制对DBMS_SNAPSHOT_UTL软件包的访问:
-- WARNING: This workaround may cause your application to work incorrectly
-- if it depends (directly or indirectly) on any of the affected database objects.
-- REVOKE_EXECUTE_PRIV: This procedure revokes all the EXECUTE privileges granted
-- to the database object identified by the parameters P_OWNER and P_OBJECT_NAME.
CREATE OR REPLACE PROCEDURE REVOKE_EXECUTE_PRIV (P_OWNER IN VARCHAR2,
P_OBJECT_NAME IN VARCHAR2) AUTHID CURRENT_USER IS
CURSOR my_cur IS
select grantee from dba_tab_privs where owner = P_OWNER AND TABLE_NAME = P_OBJECT_NAME;
BEGIN
FOR my_rec IN my_cur
LOOP
DBMS_OUTPUT.PUT_LINE ('Revoking EXECUTE privilege from ' my_rec.grantee);
EXECUTE IMMEDIATE 'REVOKE EXECUTE ON ' P_OWNER '.' P_OBJECT_NAME ' FROM ' my_rec.grantee ' FORCE';
END LOOP;
END REVOKE_EXECUTE_PRIV;
/
-- To remove all execute privileges granted on vulnerable objects execute this PL/SQL:
BEGIN
REVOKE_EXECUTE_PRIV ('SYS', 'DBMS_SNAPSHOT_UTL');
END;
/
-- To remove execute privilege granted only to PUBLIC role on vulnerable objects
-- execute this PL/SQL:
REVOKE EXECUTE ON SYS.DBMS_SNAPSHOT_UTL FROM PUBLIC FORCE;
厂商补丁:
Oracle
目前厂商还没有提供补丁或者升级程序,我们建议使用此软件的用户随时关注厂商的主页以获取最新版本:
http://www.oracle.com