Rule:

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Sid:
951

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Summary:
This event is generated when an attempt is made to access a file with 
Microsoft Personal Web Server login information.

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Impact:
If successful, the attacker can log into the system and modify web 
content.

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Detailed Information:
On systems running Microsoft Personal Web Server the file authors.pwd 
contains usernames and encrypted passwords for users who can author the 
contents on this server. The attacker can guess the exact URL of this 
file and request it, hence gaining insecure information.

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Affected Systems:
Certain versions of Microsoft Windows 95 or Windows 98 running Personal 
Web Server 4.0. Windows NT installations are not affected.

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Attack Scenarios:
An attacker can request the file from its standard location, entering 
the exact URL, and gain access to the system after cracking the 
passwords found in the file.

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Ease of Attack:
Simple.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Apply the appropriate vendor supplied patch.

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Contributors:
Original Rule Writer Unknown
Snort documentation contributed by Chaos <c@aufbix.org>

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Additional References:

Official fix:
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS99-010.asp


Nessus:
http://cgi.nessus.org/plugins/dump.php3?id=10078

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0386




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