Sophos Firewall WAF Policy Crashing System

For what it's worth, I just tried with a 600 MB file, and the same result.  I can understand if a WAF rule would fail the request or result in an error... but I wouldn't expect the whole server to become unresponsive.

Basically the system should not crash based on a core dump of some kind of process. But in proxmox, do you have a console? Is there any kind of service still running? 

I believe the console itself was completely frozen too, but I'll need to test that to answer conclusively.  I can probably do that tomorrow.  Reproducing this tonight would impact the other WAF (wife acceptance factor).

If you can reproduce it, you could observe the memory footprint of the system to check, if the firewall is increasing. 

I'm going to reproduce this in the next hour or so.  Is memory footprint the only thing you'd like me to keep an eye on?  Should I watch anything else?

I'm going to reproduce this in the next hour or so.  Is memory footprint the only thing you'd like me to keep an eye on?  Should I watch anything else?

Alright, here's what I saw on this test:

• File is a 1.3gb MP4 video.  Using Wordpress's built-in media uploading feature.
• After about 1 minute all connections went down and the firewall froze.
• Below I was able to capture "top" numbers in the firewall before the SSH session failed/froze
• I saw a spike in Proxmox for the VM's memory and CPU... but they don't strike me as problematic.
• The CPU spike did coincide with the firewall becoming unavailable.
• After another minute or two, the firewall recovered itself and everything came back to life (except for the SSH session).
• The firewall's downtime coincided with the CPU spike.
• The transfer is hanging indefinitely, and presumably will eventually fail.

NOTE: If not explicitly approved by Sophos support, any modifications
top - 11:33:07 up 22:21,  2 users,  load average: 4.52, 1.14, 0.43
Tasks: 464 total,   3 running, 459 sleeping,   0 stopped,   2 zombie
%Cpu0  :  13.1/48.8   62[|||||||||||||||||||||||||||||||||||||                       ]     %Cpu1  :  17.3/56.5   74[||||||||||||||||||||||||||||||||||||||||||||                ]
%Cpu2  :  15.2/67.3   82[|||||||||||||||||||||||||||||||||||||||||||||||||           ]     %Cpu3  :  19.4/46.7   66[||||||||||||||||||||||||||||||||||||||||                    ]
GiB Mem : 99.8/5.8      [                                                            ]
GiB Swap: 74.9/4.0      [   

Hello there,

Thank you for contacting the Sophos Community.

Did you try the suggestion Attila mentioned?

What does the Sophos Firewall system graphs at around that time?

Do you see anything under /var/cores?

Regards,

I have not tried Attila's suggestion yet.  I work from home, so I can't be bringing my firewall down over and over :-).  I will report back when I know more, but on first glance, I'm not seeing an association between WebDAV and Wordpress for the media upload  capability.

In the end it's less about the ability to upload the files, and more about the fact that the firewall crashes when I attempt to upload something which, perhaps, is unsupported.  A more graceful solution for that would definitely be appreciated... I could always upload stuff another way.  I'll report back as I learn more.

As for /var/cores, I looked in there just now, during normal operation, and see nothing.

SFVH_KV01_SFOS 19.5.0 GA-Build197# ls -l /var/cores
SFVH_KV01_SFOS 19.5.0 GA-Build197#

As for the Sophos Firewall system graphs, the test today was around 11:30.