Tofsee TLS Fingerprint Detection

[Stephen_Elliott]

Hi all,

Since the moment we updated our threat database to 8204-5736 we see THOUSANDS of 'Tofsee TLS Fingerprint Detection' threat matches.

I assume they are false positives? Anyone else seeing the same?

It's skewing our monitoring stats significantly so I may need to create an exception.

Thanks.

[LRichman]

@itsnotthenetwork 

For us, 8207_5750 was RELEASED at 20:53:04 EST and since we are set to update around midnight we still saw the Tofsee threat signatures occur until after the signature database was updated. This may have been what you saw? I agree though the signatures were too noisy to be released in the state they are in. But now that the Tofsee signature is gone, this content update released a nice new informational signature for "Non-RFC Compliant SSL Traffic on Port 443" that has begun acting up. Thus the circle of signature life continues..

[itsnotthenetwork]

@LRichman 

Is that ( subtype eq spyware ) for the "Non-RFC Compliant SSL Traffic on Port 443"?  Whats the signature ID for that?

I'm not seeing any hits for Non-RFC Compliant SSL Traffic on Port 443, but I would need to know what PAN is looking for for both signatures before I could determine why.

[LRichman]

@itsnotthenetwork 

Threat Name: Non-RFC Compliant SSL Traffic on Port 443

category-of-threatid eq protocol-anomaly
Threat ID: 56112

I am also not saying right off the bat that this signature is having issues, as it's only a handful of firewalls that I've seen so far and for a specific destination subnet. Could be an old website or server that is negotiating weak ciphers and the vulnerability signature is reporting a true positive. Further investigation is required before I can truly say if this is a weak signature or not

[Stephen_Elliott]

Hi all,

Just to confirm that our threat monitor has stopped logging the 30k+ alerts per hour for the Tofsee detection since the db update to 8207.

And I'm not seeing any problems with threat id 56112 as reported by LRichman (yet!)

[itsnotthenetwork]

The Tofsee storm has stopped for us as well.  The weird thing was the updated applied and it appeared to take 2 hours for the threats to stop flagging, and thats on 7050 hardware.  I'm just glad its over.