File: 277.txt

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Rule:

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Sid:
277

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Summary:
This event is generated when a remote attacker transmits a malformed request for a page on a RealNetworks RealServer port, which can indicate a Denial of Service (DoS) attack on the RealServer.

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Impact:
The RealNetworks RealServer service will crash.

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Detailed Information:
RealNetworks RealServer is a server application that serves streaming audio to clients. When an attacker sends a request for a template file in the /viewsource/ directory with an empty variable value, RealServer crashes.   

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Affected Systems:
Systems running RealNetworks RealServer 7.0 with View Source functionality enabled.

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Attack Scenarios:
An attacker sends an HTTP request for /viewsource/template.html? on a RealServer audio server. RealServer crashes, stopping audio transmission.

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Ease of Attack:
Simple. 

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False Positives:
If a legitimate remote user attempts to use the View Source function on the RealServer, this rule may generate an event.

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False Negatives:
None known.

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Corrective Action:
Upgrade to the latest version of the software or disable the View Source functionality. The vendor has issued an advisory, workarounds, and downloadable patches at http://service.real.com/help/faq/servgviewsrc.html.

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Contributors:
Original rule writer unknown
Sourcefire Research Team
Sourcefire Technical Publications Team
Jen Harvey <jennifer.harvey@sourcefire.com>

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Additional References:

RealNetworks
http://service.real.com/help/faq/servgviewsrc.html


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