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Rule:
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Sid:
1952
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Summary:
This event is generated when an attempt is made to mount a specific file system exported through Network File System (NFS).
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Impact:
Remote access. This mount request can give an attacker remote access to an NFS directory if it is successful.
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Detailed Information:
The mountd Remote Procedure Call (RPC) implements the NFS mount protocol. When an NFS client requests a mount of an NFS file system, mountd examines the list of exported file systems. If the NFS client is permitted access to the requested file system, mountd returns a file handle for the requested directory. An attacker or legitimate NFS client may request a mount of a specific file system.
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Affected Systems:
All systems running NFS.
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Attack Scenarios:
An attacker may attempt to mount an NFS directory to read or change files.
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Ease of Attack:
Simple.
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False Positives:
If a legitimate remote user is allowed to mount NFS file systems, this rule may trigger.
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False Negatives:
None Known.
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Corrective Action:
Limit remote access to RPC services.
Filter RPC ports at the firewall to ensure access is denied to RPC-enabled machines.
Disable unneeded RPC services.
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Contributors:
Original rule written by Max Vision <vision@whitehats.com>
Modified by Brian Caswell <bmc@sourcefire.com>
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>
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Additional References:
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