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Defining what "direction" represents in an NSM alert

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Hello, I have an alert for which I would appreciate some information/confirmation:

|"HTTP: Mozilla Firefox Vorbis Audio Residue Codebook Out of Bounds Write Vulnerability"
SIP : 52.x.x.x:80
DIP : 10.x.x.x:37756

direction : inbound

I was under the impression from an earlier question to McAfee that the inbound/outbound direction was determined by the original SYN packet i.e. who initiated the sesssion.

From the above, since the source is a server (port 80) it normally would NOT be the initiator of the session so the direction, "inbound" must have been determined by the SIP/DIP of the IP header. This contradicts my earlier understanding of what "direction" means.

Can someone from McAfee please clarify?

TIA

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McAfee Employee
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Re: Defining what "direction" represents in an NSM alert

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Hi @ihoratos 

To determine direction, the Sensor considers the physical port on which the SYN packet arrives:
• If the SYN packet arrives on the port connected to the inside network, the entire flow is considered
outbound.
• If the SYN packet arrives on the port connected to the outside network, the entire flow is considered
inbound.

 

Regards,
Faizan

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McAfee Employee
McAfee Employee
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Message 2 of 2

Re: Defining what "direction" represents in an NSM alert

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Hi @ihoratos 

To determine direction, the Sensor considers the physical port on which the SYN packet arrives:
• If the SYN packet arrives on the port connected to the inside network, the entire flow is considered
outbound.
• If the SYN packet arrives on the port connected to the outside network, the entire flow is considered
inbound.

 

Regards,
Faizan

Was my reply helpful?
If you find this post useful, please give it a Kudos! l Also, Please don't forget to select "Accept as a solution" if this reply resolves your query!

View solution in original post

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