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Drop & blacklist on multiple AUTH failures

Last post 04-23-2008, 23:46 by dilberts_left_nut. 2 replies.
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  •  04-23-2008, 7:50

    Drop & blacklist on multiple AUTH failures

    Would be nice if this was available in the server modules to thwart dictionary attacks like so:

    17:43:14.765: >> AUTH LOGIN<cr><lf>
    17:43:14.792: << 334 VXNlcm5hbWU6<cr><lf>
    17:43:15.613: >> d2VibWFzdGVy<cr><lf>
    17:43:15.613: << 334 UGFzc3dvcmQ6<cr><lf>
    17:43:16.425: >> IUAjJCVeJio=<cr><lf>
    17:43:16.425: << 501 Authentication failed - bad user or password.<cr><lf>
    17:43:17.378: >> AUTH LOGIN<cr><lf>
    17:43:17.404: << 334 VXNlcm5hbWU6<cr><lf>
    17:43:18.213: >> d2VibWFzdGVy<cr><lf>
    17:43:18.213: << 334 UGFzc3dvcmQ6<cr><lf>
    17:43:18.028: >> OTEx<cr><lf>
    17:43:18.028: << 501 Authentication failed - bad user or password.<cr><lf>
    17:43:19.835: >> AUTH LOGIN<cr><lf>
    17:43:19.839: << 334 VXNlcm5hbWU6<cr><lf>
    17:43:20.643: >> d2VibWFzdGVy<cr><lf>
    17:43:20.643: << 334 UGFzc3dvcmQ6<cr><lf>
    17:43:21.447: >> OTEx<cr><lf>
    17:43:21.447: << 501 Authentication failed - bad user or password.<cr><lf>
    17:43:22.478: >> AUTH LOGIN<cr><lf>
    17:43:22.567: << 334 VXNlcm5hbWU6<cr><lf>
    17:43:23.369: >> d2VibWFzdGVy<cr><lf>
    17:43:23.369: << 334 UGFzc3dvcmQ6<cr><lf>
    17:43:24.191: >> OTExMTE=<cr><lf>
    17:43:24.191: << 501 Authentication failed - bad user or password.<cr><lf>
    17:43:24.998: >> AUTH LOGIN<cr><lf>
    17:43:24.000: << 334 VXNlcm5hbWU6<cr><lf>
    17:43:25.810: >> d2VibWFzdGVy<cr><lf>
    17:43:25.810: << 334 UGFzc3dvcmQ6<cr><lf>
    17:43:26.610: >> OTExMTE=<cr><lf>
    17:43:26.610: << 501 Authentication failed - bad user or password.<cr><lf>

     

    and it is still going!

    Have added the ip to the Connection Control list but an automatic option would be nice!

     

  •  04-23-2008, 23:25

    Re: Drop & blacklist on multiple AUTH failures

    Has been implemented in MercuryS, MercuryP and MercuryI modules of the upcoming v4.6x release, looks like

    554 Too many failed RCPT commands - terminating connection.
    

    Kind regards / Peter
  •  04-23-2008, 23:46

    Re: Drop & blacklist on multiple AUTH failures

    Ask, and ye shall ... find out you are already about to receive Big Smile
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