| GEN:SID | 1:1952 |
| Message | RPC mountd UDP mount request |
| 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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| 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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| Additional References | |