File: 1840.txt

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Rule:

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Sid:
1840

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Summary:
This event is generated when a client on the protected network has 
possibly visited a website containing malicious javascript code.

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Impact:
Minimal

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Detailed Information:
Implementations of Javascript in multiple browsers on multiple platforms
contain an error that may lead to a user inadvertantly running
Javascript code of an attackers choosing. IP address lookup for a fully
qualified domain name is not performed when choosing whether Javascript 
should be executed, if the hostname is served from a DNS server
controlled by the attacker it may be possible for the attacker to run
code of their choosing. 

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Affected Systems:
	Multiple browsers on multiple platforms.

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Attack Scenarios:
An attacker might try to fool a user into clicking a link in an email
that points at an intranet server. The attacker is then able to run
Javascript from a secondary host purporting to be the intranet server.

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

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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com> 

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Additional References:

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