How to size buckets for slow ssh invalid user attempts
I have bots trying to slowly ssh as different invalid users. I'd like to get these banned.
I have a out the box install with /etc/crowdsec/scenarios/ssh-slow-bf.yaml having a leaky bucket set to
leakspeed: 60s
capacity: 10
blackhole: 1m
this seems to miss the attempt (sample attached)
2 Replies
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Take a look at my pending changes to introduce a
time-based variant which should detect really slow brute force
https://github.com/crowdsecurity/hub/pull/1566GitHub
ssh: improve bruteforce detection and add time-based-bf scenario by...
Description
Reduce ssh-bf capacity from 5 to 3 for faster detection
Reduce ssh-slow-bf capacity from 10 to 5 to reduce overlap
Add new crowdsecurity/ssh-time-based-bf conditional scenario
Detects...