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Rule:
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Sid:
3218
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Summary:
This rule generates an event when an attempt is made to exploit a known
vulnerability in Microsoft RPC DCOM.
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Impact:
Execution of arbitrary code leading to full administrator access of the
machine. Denial of Service (DoS).
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Detailed Information:
A vulnerability exists in Microsoft RPC DCOM such that execution of
arbitrary code or a Denial of Service condition can be issued against a
host by sending malformed data via RPC.
The Distributed Component Object Model (DCOM) handles DCOM requests sent
by clients to a server using RPC. A malformed request to an RPC port
will result in a buffer overflow condition that will present the
attacker with the opportunity to execute arbitrary code with the
privileges of the local system account.
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Affected Systems:
Windows NT 4.0
Windows NT 4.0 Terminal Server Edition
Windows 2000
Windows XP
Windows Server 2003
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Attack Scenarios:
An attacker may make a request for a file with an overly long filename
via a network share.
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Ease of Attack:
Simple. Expoit code exists.
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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 patches.
Block access to RPC ports 135, 139 and 445 for both TCP and UDP
protocols from external sources using a packet filtering firewall.
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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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