Ubuntu Security Notice 1467-1 - It was discovered that certain builds of MySQL incorrectly handled password authentication on certain platforms. A remote attacker could use this issue to authenticate with an arbitrary password and establish a connection. MySQL has been updated to 5.5.24 in Ubuntu 12.04 LTS. Ubuntu 10.04 LTS, Ubuntu 11.04 and Ubuntu 11.10 have been updated to MySQL 5.1.63. A patch to fix the issue was backported to the version of MySQL in Ubuntu 8.04 LTS. Various other issues were also addressed.
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