Rule:  

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Sid:
1601

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Summary:
This event is generated when an attempt is made to read a file on a host using a well known vulnerability in htdig.

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Impact:
Severe. Unauthorized file access

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Detailed Information:
Some versions of htdig allow inclusions to be made from configuration files as a parameter to the htsearch function. Any file can be included by enclosing it in single quotes ('foo').

Using this vulnerability, any single quoted input string (`....`) is included as an index file by htsearch. This allows an attacker to read any file on the host.

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Affected Systems:
HTDig versions 3.1.1, 3.1.2, 3.1.3, 3.1.4 and 3.2.0b1

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Attack Scenarios:
A input form with a textbox named "Exclude" and http post action handled by htsearch or a url similar to http://www.foo.com/cgi-bin/htsearch?Exclude=%60/anyfile%60 can be used to access files on your host. %60 is the single quote caracter "`".

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Ease of Attack:
Simple. No exploit scripts required

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False Positives:
None known

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False Negatives:
None known

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Corrective Action:
Upgrade to the latest non-affected version of the software.

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Contributors:
Snort documentation contributed by Ueli Kistler, <u.kistler@engagesecurity.com>
Sourcefire Vulnerability Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

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