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V-235027

CAT II (Medium)

The SUSE operating system must not have network interfaces in promiscuous mode unless approved and documented.

Rule ID

SV-235027r991589_rule

STIG

SUSE Linux Enterprise Server 15 Security Technical Implementation Guide

Version

V2R7

CCIs

None

Discussion

Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized individuals can access these applications, it may allow then to collect information such as logon IDs, passwords, and key exchanges between systems. If the system is being used to perform a network troubleshooting function, the use of these tools must be documented with the Information System Security Officer (ISSO) and restricted to only authorized personnel.

Check Content

Verify the SUSE operating system network interfaces are not in promiscuous mode unless approved by the ISSO and documented.

Check for the status with the following command:

> ip link | grep -i promisc

If network interfaces are found on the system in promiscuous mode and their use has not been approved by the ISSO and documented, this is a finding.

Fix Text

Configure the SUSE operating system network interfaces to turn off promiscuous mode unless approved by the ISSO and documented.

Set the promiscuous mode of an interface to off with the following command:

> sudo ip link set dev <devicename> promisc off