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GEN:SID | 1:1925 |
Message | RPC mountd TCP exportall request |
Summary | This event is generated when a request is made to Network File System (NFS) to list all exported file systems and to indicate which clients are permitted to mount each file system. |
Impact | Information disclosure. This can allow an attacker to discover exported NFS file systems and client mount permissions. |
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 list of exported file systems and client mount permissions. |
Affected Systems | All systems running NFS. |
Attack Scenarios | An attacker may attempt to list the exported NFS file systems as a precursor to mounting them to read or change a specific file. |
Ease of Attack | Simple. |
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. |
Additional References | http://www.whitehats.com/info/IDS26 |
Rule References | arachnids: 26 |
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DID:871026
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