On 0, Worthy <listy@home.olsztyn.pl> allegedly wrote:
Hello,
Can somebody could tell me what is that rule looking for?
http://www.snort.org/snort-db/sid.html?sid=1333
alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS
(msg:"WEB-ATTACKS id command attempt"; flow:to_server,established;
content:"|3B|id"; nocase; classtype:web-application-attack;
sid:1333; rev:6;)
What means "|3B|id" string?
3B is the Hex code for the character ";". Which means the rule looks for
attempts to run the command "id" which can occur in something like this:
http://www.foo.com/bar/somescript?input;id
The character ";" can be used on Unix/Linux style systems to enable more
than one command to be processed on a command line. Say something like
this:
#> ls; id
So if your script does not correctly sanitize user input or allows for the
addition of user supplied data to a POST/GET request for example, the
command "id" could be run and would return data on the user running the
webserver.
All alerts triggered by that rule are for PHP-Nuke 6.0.
The query is POST /index.php , should I need to worry?
Does the script have something like index.php&foo;id in it as a POST
parameter?
Are your $EXTERNAL_NET and $HTTP_SERVERS variables set correctly?
--
Best regards,
Worthy mailto: listy@home.olsztyn.pl
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,,_ Nigel Houghton Research Engineer Sourcefire Inc.
o" )~ Vulnerability Research Team
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