[Zeek] SSH auth_success state true set, but admin claims no logins

Matt Trostel tet68mt at gmail.com
Mon Sep 16 12:05:22 PDT 2019

We have seen this same behavior. I didn’t do much digging on it at the time, but will keep an eye out for the next occurrence.

-- Matt Trostel

> On Sep 16, 2019, at 13:14, Collyer, Jeffrey W (jwc3f) <jwc3f at virginia.edu> wrote:
> So recently I saw an SSH login to a device from outside the US.  I reported it to the end system admin.  The Zeek log set the auth_success state to true, but the admin of the box claims no successful login and is pushing back that it is a false positive.  
> Have other Zeek users ever seen this?  Is the SSH auth state detection mistaken here?
> I don’t have pcaps to verify one way to the other, sadly.
> {"_path":"ssh","_system_name":"corelight","_write_ts":"2019-09-12T22:26:32.106142Z","ts":"2019-09-12T22:26:31.226136Z","uid":"C95i0o2Jl77LXHb2R9","id.orig_h”:”x.x.x.x","id.orig_p":49670,"id.resp_h”:”x.x.x.x","id.resp_p":22,"version":2,"auth_success":true,"auth_attempts":1,"direction":"INBOUND","client":"SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.4","server":"SSH-2.0-OpenSSH_7.4","cipher_alg":"chacha20-poly1305 at openssh.com","mac_alg":"umac-64-etm at openssh.com","compression_alg":"none","kex_alg":"curve25519-sha256 at libssh.org","host_key_alg":"ecdsa-sha2-nistp256","host_key":"68:1e:68:89:5e:e5:20:72:f7:e6:bf:21:de:07:3a:b1”}
> Can anyone shed light on this?
> Thanks
> Jeff
> Jeffrey Collyer
> Information Security Engineer
> University of Virginia
> jwc3f at virginia.edu
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