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TITLE:
MySQL MERGE Table Privilege Revoke Bypass
SECUNIA ADVISORY ID:
SA21259
VERIFY ADVISORY:
http://secunia.com/advisories/21259/
CRITICAL:
Not critical
IMPACT:
Security Bypass
WHERE:
>From local network
SOFTWARE:
MySQL 5.x
http://secunia.com/product/8355/
MySQL 4.x
http://secunia.com/product/404/
MySQL 3.x
http://secunia.com/product/99/
DESCRIPTION:
Peter Gulutzan has reported a vulnerability in MySQL, which can be
exploited by malicious users to bypass certain security
restrictions.
The vulnerability is caused due to a design error in the user
privilege verification for MERGE tables. This can be exploited to
keep access to a table via an in advance created MERGE table even
after the privileges has been revoked for the table.
SOLUTION:
MySQL 4.1.x:
Update to version 4.1.21.
MySQL 5.x:
The vulnerability has been fixed in the CVS repository and will also
be fixed in the upcoming 5.0.24 version.
Grant only trusted users access to the database.
NOTE: The vulnerability has been fixed by introducing the
"–skip-merge" command line option which disables the MERGE storage
engine.
PROVIDED AND/OR DISCOVERED BY:
Peter Gulutzan
ORIGINAL ADVISORY:
MySQL:
http://dev.mysql.com/doc/refman/4.1/en/news-4-1-21.html
http://dev.mysql.com/doc/refman/5.0/en/news-5-0-24.html
About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.
Subscribe:
http://secunia.com/secunia_security_advisories/
Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/
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