Some vulnerabilities have been reported in MariaDB, which can be exploited by malicious users to cause a DoS (Denial of Service).
1) A NULL pointer dereference error within the "test_if_skip_sort_order()" function (sql_select.cc) when executing subqueries can be exploited to crash the service via a specially crafted query.
2) An error exists within the "select_describe()" function (sql/sql_select.cc) when handling certain subqueries, which frees certain currently used tables and can be exploited to cause a crash via a specially crafted query.
3) An error when handling the query cache when running parallel queries can be exploited to cause a crash via specially crafted queries run in parallel.
The vulnerabilities are reported in version 5.5.25. Other versions may also be affected.
Solution: Fixed in development version 5.5.27.
Provided and/or discovered by: 1, 2) Reported by the vendor.
3) jbergstroem in a bug report
Original Advisory: http://kb.askmonty.org/en/mariadb-5527-release-notes/
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Subject: MariaDB Multiple Denial of Service Vulnerabilities
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