1455.txt

snort入侵检测规则文件2.4 Snort是众所周知的网络入侵检测工具

Rule:  

--
Sid:
1455

--
Summary: 
This event is generated when an attempt is made to access a web 
application that may lead to exploitation of the application.

--
Impact: 
Potentially harmful execution of binaries through perl open()

--
Detailed Information: 
An open source calendar perl script by Matt Kruse, Allows commands to be
executed without input verification using the perl open() function. ie
/cgi-bin/calendar.pl place the string "|ping 127.0.0.1|" in the
configuration file field, this executes the command "ping 127.0.0.1" 

--
Affected Systems:
	Matt Kruse Calendar Script version 2.2.

--
Attack Scenarios: 
An unauthenticated user can execute arbitrary programs on the server by
accessing calendar.pl and inputting commands such as "|mail
/etc/passwd|" into the configuration file field.

--
Ease of Attack: 
Simple. No exploit software required.

--
False Positives: 
If your webserver has pages by the name of calendar.pl this rule will
fire often. Many sites now use calendar applications and this rule may 
generate a large number of false positives, it does not distinguish 
between perl cgi applications and php scripts. Consider tuning this rule
for your site if it is generating a large number of false positives. If 
you use a calendar application, consider changing the name of the script
to something other than "calendar.pl".

--
False Negatives: 
None known.

--
Corrective Action: 
Download a newer version of the cgi 

--
Contributors: 
Original Rule Writer Unknown
Snort documentation contributed by Aaron Navratil (Initial Research)
Snort documentation contributed by Josh Gray (Edits)
Sourcefire Research Team
Nigel Houghton <[e-mail]>

-- 
Additional References:

Bugtraq:
http://online.securityfocus.com/bid/1215

--