RPC portmap mountd request UDP
|Alert||RPC portmap mountd request UDP|
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.
- Caldera OpenLinux Standard 1.2
- RedHat Linux 2.0, 2.1, 3.0.3, 4.0, 4.1, 4.2, 5.0, 5.1
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.
If a legitimate remote user is allowed to access mountd, this rule may trigger.
An attacker can query the portmapper to discover the port where mountd runs. This may be a precursor to accessing mountd.
- 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.