script:x509_ext_c2
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script:x509_ext_c2 [2018/02/08 23:59] – [The Full Text Search FTS Document] veera | script:x509_ext_c2 [2024/06/05 10:40] – old revision restored (2018/02/09 00:01) thiyagu | ||
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In this technique the covert channel is built by stuffing chunks of data into X.509 Certificate Extensions, in this case the " | In this technique the covert channel is built by stuffing chunks of data into X.509 Certificate Extensions, in this case the " | ||
- | Detecting this is quite easy with Trisul as well as Bro IDS. This post highlights the different approaches taken. | + | Detecting this is quite easy with [[https:// |
===== Trisul vs Bro approaches to the same problem | ===== Trisul vs Bro approaches to the same problem | ||
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- the **Resource** stream: | - the **Resource** stream: | ||
- | - the **FTS** stream: a complete text dump of the meta data. For example : The DNS FTS stream would contain documents with a full dump of all DNS fields - much like the DIG format. Similarly for SSL Certificates, | + | - the **FTS** stream: a complete text dump in some canonical format. For example : The DNS FTS stream would contain documents with a full dump of all DNS fields - much like the DIG format. Similarly for SSL Certificates, |
You can see the **different approach taken by Trisul NSM compared to Bro IDS**. Instead of fine grained events preferred by Bro IDS, Trisul provides a text document. | You can see the **different approach taken by Trisul NSM compared to Bro IDS**. Instead of fine grained events preferred by Bro IDS, Trisul provides a text document. | ||
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==== Analysing the sample PCAP in Trisul ==== | ==== Analysing the sample PCAP in Trisul ==== | ||
- | The researchers have provided a [[https:// | + | The researchers have provided a [[https:// |
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- | Next you have to write a small LUA script that plugs into the FTS SSL Certs Stream. Your script will then get a chance to peek at each certificate //out of the fast packet path// | + | Next you have to write a small LUA script that plugs into the FTS SSL Certs Stream. Your script will then get a chance to peek at each certificate //out of the fast packet path// |
I just put together a quick [[https:// | I just put together a quick [[https:// | ||
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The [[https:// | The [[https:// | ||
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script/x509_ext_c2.txt · Last modified: 2024/06/05 10:49 by thiyagu