File: 1016.txt

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Rule:

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Sid:
1016

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Summary:
This event is generated when an attempt is made to craft a URL containing a reference to the "/global.asa" file.

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Impact:
Intelligence gathering.  This attack may permit disclosure of the source code of global.asa file that is not normally available for viewing.

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Detailed Information:
Microsoft Internet Information Services (IIS) 5.0 contains scripting engines to support various advanced files types such as .ASP and .HTR.  The scripting engines permit the execution of server-side processing.  IIS determines which scripting engine is appropriate depending on the file extension.  If an attacker crafts a URL request ending in 'Translate: f' and followed by a slash '/', IIS fails to send the file to the appropriate scripting engine for processing.  Instead, it returns the source code of a referenced file, such as global.asa, to the browser.  The Nessus vulnerability scanner references the global.asa file in a GET request to determine whether a host is susceptible to this exploit.

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Affected Systems:
Microsoft IIS 5.0

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Attack Scenarios:
An attacker can craft a URL that includes the 'Translate: f' followed by a '/' to disclose the source code of a file such as global.asa on the vulnerable server. 

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Ease of Attack:
Simple.  The Nessus vulnerability scanner can test for this exploit. 

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False Positives:
None Known.

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False Negatives:
None Known.

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Corrective Action:
Apply the patch referenced in the Microsoft link.

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Contributors:
Original rule writer unknown
Modified by Brian Caswell <bmc@sourcefire.com>
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

Microsoft
http://www.microsoft.com/technet/security/bulletin/MS00-058.asp

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