A security issue and two vulnerabilities have been reported in Oracle MySQL, which can be exploited by malicious users to cause a DoS (Denial of Service) and by malicious people to bypass certain security restrictions.
1) An error when verifying authentication attempts can be exploited to bypass the authentication mechanism.
Successful exploitation of this security issue requires MySQL to be built on a system with a library that allows "memcmp()" to return a value outside of the -128 through 127 range (e.g. sse-optimized glibc).
NOTE: Vendor binaries are reportedly not affected.
The security issue is reported in versions prior to 5.1.63 and 5.5.25.
2) An unspecified error in the Optimizer subcomponent of the MySQL Server component can be exploited by authenticated users to cause a hang or frequently repeatable crash.
This vulnerability is reported in versions prior to 5.1.63 and 5.5.23.
3) An error when handling the creation of a reference for a sort order index can be exploited to calculate an incorrect key length and cause a crash.
This vulnerability is reported in versions prior to 5.5.24.
Solution: Update to version 5.1.63 or 5.5.25.
Provided and/or discovered by: 1, 3) Reported by the vendor.
2) It is currently unclear who reported this vulnerability as the Oracle Critical Patch Update for October 2013 only provides a bundled list of credits. This section will be updated when/if the original reporter provides more information.
Original Advisory: Oracle:
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Subject: Oracle MySQL Multiple Vulnerabilities
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