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  1. MariaDB Server
  2. MDEV-3915

COM_CHANGE_USER allows fast password brute-forcing

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 5.5.28a, 5.3.11, 5.2.13, 5.1.66
    • Fix Version/s: 5.5.29, 5.2.14, 5.3.12
    • Component/s: None
    • Labels:
      None

      Description

      If one tries to connect with an incorrect password, the connection is aborted, one has to connect again to try a new password. But if one tries an incorrect password with the COM_CHANGE_USER command, he is not disconnected, which allows to brute-force passwords faster. Additionally, all COM_CHANGE_USER issued in a connection use the same scramble value.

      We can fix it by allowing only three (or any other small fixed number?) of failed COM_CHANGE_USER in a connection.

      It probably shouldn't be "three fails in a row", because one would be able to alternate between two known accounts and continue trying other password.

      Additionally we might add a one second (or any other short fixed time duration) delay after a failed connection or a COM_CHANGE_USER attempt.

        Activity

        Show
        serg Sergei Golubchik added a comment - - edited http://seclists.org/fulldisclosure/2012/Dec/58
        Hide
        iankko Jan Lieskovsky added a comment -

        The CVE identifier of CVE-2012-5627 has been assigned to this issue:
        http://www.openwall.com/lists/oss-security/2012/12/06/4

        Show
        iankko Jan Lieskovsky added a comment - The CVE identifier of CVE-2012-5627 has been assigned to this issue: http://www.openwall.com/lists/oss-security/2012/12/06/4

          People

          • Assignee:
            serg Sergei Golubchik
            Reporter:
            serg Sergei Golubchik
          • Votes:
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            Dates

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              Updated:
              Resolved:

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