[Snort-users] Re: SCAN UPnP service discover attempt

Folks,

I'm getting a number of the above alerts & i'm not sure what the source
addresses are looking for.

Machines on my subnet and only my subnet out of 40+ lans are triggering the
rule for a SCAN UPnP service discover attempt

The M-Search phrase seems to be the reason for the alert - I get the
following message:

|-----------------------------------------------------------------------------|
| 000 : 4D 2D 53 45 41 52 43 48 20 2A 20 48 54 54 50 2F M-SEARCH * HTTP/ |
| 010 : 31 2E 31 0D 0A 48 4F 53 54 3A 20 32 33 39 2E 32 1.1..HOST: 239.2 |
| 020 : 35 35 2E 32 35 35 2E 32 35 30 3A 31 39 30 30 0D 55.255.250:1900. |
| 030 : 0A 4D 41 4E 3A 20 22 73 73 64 70 3A 64 69 73 63 .MAN: "ssdp:disc |
| 040 : 6F 76 65 72 22 0D 0A 4D 58 3A 20 32 0D 0A 53 54 over"..MX: 2..ST |
| 050 : 3A 20 75 72 6E 3A 73 63 68 65 6D 61 73 2D 75 70 : urn:schemas-up |
| 060 : 6E 70 2D 6F 72 67 3A 73 65 72 76 69 63 65 3A 57 np-org:service:W |
| 070 : 41 4E 49 50 43 6F 6E 6E 65 63 74 69 6F 6E 3A 31 ANIPConnection:1 |
| 080 : 0D 0A 0D 0A .... |
| |
|-----------------------------------------------------------------------------|



I take it this is a false positive but i'm curious as to exactly whats
happening - the destination address in each case is my router and the
destination port in each alert is 1900 (SSDP) over udp

Any views/opinions are gratefully accepted

thanks

michael mulholland


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