Runaway ProFTP?

Jerry Bell jerry at
Fri Dec 10 22:00:44 UTC 2010

I have been having this happen a few times per week for the past few 
weeks.  I believe it is caused by someone attacking proftpd.  I noticed 
today that there is an updated version - 1.3.3c that fixes a 
vulnerability that they may have been trying to exploit.

When I looked at the process list, I would see around 20 proftpd's, each 
with a high amount of CPU used, and connected to a specific IP.  I'd 
firewall off those IPs and kill off proftpd/restart.  Knock on wood, I 
have not had that happen since upgrading to 1.3.3c, but that may just be 
because no one has tried again yet.

On 12/10/2010 4:39 PM, Ryan Coleman wrote:
> Does anyone have any ideas?
> On Dec 9, 2010, at 3:12 PM, Ryan Coleman wrote:
>> Dear list,
>> Has anyone else had experience with ProFTP 1.3.3a running away with processes? I installed it about 2 months ago with a new server build and over the course of the last three weeks I've had to forcibly kill, wait and restart the service every one-to-three days and sucking up between 20% and 80% of my system resources.
>> I've attempted to change the logging in hopes to track down what is causing the problems but I have not been successful. Additionally it won't connect after a restart through Filezilla but using Terminal on my MBP it will connect in the CLI.
>> It's not the end of the world (for me) but it is for my staff when they have to upload large numbers of photos.
>> Thanks,
>> Ryan
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