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Rule:
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Sid:
1455
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Summary:
This event is generated when an attempt is made to access a web
application that may lead to exploitation of the application.
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Impact:
Potentially harmful execution of binaries through perl open()
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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"
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Affected Systems:
Matt Kruse Calendar Script version 2.2.
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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.
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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".
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False Negatives:
None known.
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Corrective Action:
Download a newer version of the cgi
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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 <nigel.houghton@sourcefire.com>
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Additional References:
Bugtraq:
http://online.securityfocus.com/bid/1215
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