Slow password guessing for imaps / 2018-06-22

2018-06-22 Slow password guessing for imaps 3 months ago
Interesting in the logs:
Jun 19 21:22:29 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.9]
Jun 19 21:23:30 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.9]
Jun 19 21:27:05 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.11]
Jun 19 21:31:58 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.11]
Jun 19 22:27:15 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.9]
Jun 19 22:30:10 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.9]
Jun 19 22:44:17 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.11]

..

Jun 22 14:23:39 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.11]
Jun 22 14:24:35 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.11]
Jun 22 15:20:05 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.9]
Jun 22 15:21:01 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.9]
Jun 22 15:29:18 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.11]
Jun 22 15:30:06 greenblatt imapd-ssl: LOGIN FAILED, method=PLAIN, ip=[::ffff:5.188.207.11]
Every time fail2ban blocks the addresses for a while but the attacker is more persistant than that.

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, reachable as koos+website@idefix.net. PGP encrypted e-mail preferred.

PGP key 5BA9 368B E6F3 34E4 local copy PGP key 5BA9 368B E6F3 34E4 via keyservers pgp key statistics for 0x5BA9368BE6F334E4 Koos van den Hout
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