Snort mailing list archives
Re: why UDP disc acquire?
From: Andrey Kiryukhin <andrei_1980 () mail ru>
Date: Sun, 26 Jun 2016 01:54:20 +0300
Thank you, guys. It's realy malformed packet, because udp length was incorrect. In pcap file: IP total length = 828 bytes UDP length = 800 bytes , but it must be 808 bytes. I correct this in pcap file, and now Snort generate alerts on this pcap file. Thanks. 25.06.2016 15:50, wkitty42 () windstream net пишет:
On 06/25/2016 05:01 AM, Andrey Kiryukhin wrote:Why you think that udp packet malformed? Tools like wireshark, tcpdump and tcpreplay handle it correctly. This packets have only wrong checksum, but i disable checksum control in Snort by using option "-k none".a wrong checksum indicates several possible problems... malformed packet corrupted packet modified packet bad checksum formula yes, some would say that the first three are the same thing but there are subtle differences... the first one is generated incorrectly, the second one has been damaged somewhere along the line and the third one has been modified somehow along the line...
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Current thread:
- why UDP disc acquire? Andrey Kiryukhin (Jun 24)
- Re: why UDP disc acquire? Al Lewis (allewi) (Jun 24)
- Re: why UDP disc acquire? Andrey Kiryukhin (Jun 24)
- Re: why UDP disc acquire? Al Lewis (allewi) (Jun 24)
- Re: why UDP disc acquire? Andrey Kiryukhin (Jun 25)
- Re: why UDP disc acquire? wkitty42 (Jun 25)
- Re: why UDP disc acquire? Andrey Kiryukhin (Jun 25)
- Re: why UDP disc acquire? Al Lewis (allewi) (Jun 25)
- Re: why UDP disc acquire? Al Lewis (allewi) (Jun 25)
- Re: why UDP disc acquire? Andrey Kiryukhin (Jun 24)
- Re: why UDP disc acquire? Al Lewis (allewi) (Jun 24)