Rule:

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Sid:
1291

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Summary:
This event is generated when an attempt is made to exploit a known  vulnerability on a web server or a web application resident on a web server.

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Impact:
Information gathering and system integrity compromise. Possible unauthorized administrative access to the server. Possible execution of arbitrary code of  the attackers choosing in some cases.

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Detailed Information:
This event is generated when an attempt is made to compromise a host running a Web server or a vulnerable application on a web server.

Many known vulnerabilities exist for each implementation and the attack scenarios are legion.

Some applications do not perform stringent checks when validating the credentials of a client host connecting to the services offered on a host server. This can lead to unauthorized access and possibly escalated privileges to that of the administrator. Data stored on the machine can be compromised and trust relationships between the victim server and  other hosts can be exploited by the attacker.

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Affected Systems:
All systems using a web server.

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Attack Scenarios:
Many attack vectors are possible from simple directory traversal to exploitation of buffer overflow conditions.

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Ease of Attack:
Simple. Exploits exist.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Ensure the system is using an up to date version of the software and has had all vendor supplied patches applied.

Check the host logfiles and application logs for signs of compromise.

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Contributors:
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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