[CentOS] VSFTPD accepting same user/session from different IP addresses

Kai Schaetzl maillists at conactive.com
Mon Mar 22 16:31:18 UTC 2010

Dirk H. Schulz wrote on Mon, 22 Mar 2010 15:41:55 +0100:

> makes me think that the same session with the same commands is 
> "delivered" via 2 outgoing gateways, because it would be very 
> complicated to have two ftp clients issue the same command in the same 
> second. Know what I mean?

No, I don't know. This is *one* client and I bet it's the dreaded 
Filezilla. It opens multiple parallel connections if you don't configure 
it correctly. And then it's just a matter of how your internet connection 
and gateway is setup. This is a big institution with a big IP range 
(whois.ripe.net). It's not your usual type of connection, but it's nothing 
wrong with it.

> By the way, vsftpd seems not to handle this situation securely, so I 
> want to prevent any occurance of it.

Again, what's the security problem here?


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