Snort mailing list archives
Re: content |00|
From: Ryan Russell <ryan () securityfocus com>
Date: Tue, 11 Dec 2001 10:20:54 -0700 (MST)
On Tue, 11 Dec 2001, RAMALINGA Reddy wrote:
Hello Gurus, I came across somany snort rules which contain "|00|" in the content. Can any one explain what it means ? Is it a kind of NOOP? thanks in advance, Rali
That's how Snort does hexadecimal character in rules, between vertical bars, "|". So |00| is just a byte containing zero. Yes, it's used in a number of rules, such as those looking for unicode, which will look like u|00|n|00|i|00|c|00|d|00|e|00|. There are also rules which look for null bytes being passsed to web apps. Some cgi parsers will will recognize |00| as a string terminator, but when it gets handed to a perl interpreter, it will not, allowing for a hole in some cases. Ryan _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- content |00| RAMALINGA Reddy (Dec 11)
- Re: content |00| Ryan Russell (Dec 11)