SID 1:579

Rule Category

PROTOCOL-RPC -- Snort has detected traffic that may indicate the presence of the rpc protocol or vulnerabilities in the rpc protocol on the network.

Alert Message

PROTOCOL-RPC portmap mountd request UDP

Rule Explanation

This event is generated when an attempt is made through a portmap GETPORT request to discover the port where the Remote Procedure Call (RPC) mountd is listening. Impact: Information disclosure. This request is used to discover which port mountd is using. Attackers can also learn what versions of the mountd protocol are accepted by mountd. Details: The portmapper service registers all RPC services on UNIX hosts. It can be queried to determine the port where RPC services such as mountd run. The mountd RPC service allows remote file system access through Network File System (NFS). A vulnerability exists in the code that logs NFS mount activity that can cause a buffer overflow, allowing the execution of arbitrary code with root privileges. Ease of Attack: Simple.

What To Look For

No information provided

Known Usage

No public information

False Positives

Known false positives, with the described conditions

If a legitimate remote user is allowed to access mountd, this rule may trigger.

Contributors

Original rule written by Max Vision <vision@whitehats.com> Modified by Brian Caswell Cisco Talos Judy Novak