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Home » Kerio User Forums » Kerio Connect » Username enumeration via RCPT command allowed
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credo

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I'm using Kerio Connect latest and greatest version. During annual penetration test it was discovered that username enumeration via RCPT is allowed. And I agree with pentester, this is an issue.
I also created support ticket but thought it may be useful for other Kerio users to acknowldge this issue and is anybody has, to share thoughts.

I removed all server and domain specific information though.

Cheers,
Mati

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Brian (GFI/Kerio)

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By default Kerio Connect allows up to 5 failed guesses before blocking the remote host. You can lower this value to pass the test. This setting is in the STMP server in the security options.

Brian Carmichael
Instructional Content Architect
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