cyberstrikeus 2.3.3 Ensure talk client is not installed (Automated)
Profile
- Level 1 - Server
- Level 1 - Workstation
Description
The talk software makes it possible for users to send and receive messages across systems through a terminal session. The talk client, which allows initialization of talk sessions, is installed by default.
Rationale
The software presents a security risk as it uses unencrypted protocols for communication.
Impact
Many insecure service clients are used as troubleshooting tools and in testing environments. Uninstalling them can inhibit capability to test and troubleshoot. If they are required it is advisable to remove the clients after use to prevent accidental or intentional misuse.
Audit Procedure
Command Line
Verify talk is not installed. The following command may provide the needed information:
# dpkg-query -s talk &>/dev/null && echo "talk is installed"
Nothing should be returned.
Expected Result
No output (empty result).
Remediation
Command Line
Uninstall talk:
# apt purge talk
References
- NIST SP 800-53 Rev. 5: CM-7
CIS Controls
- v8: 4.8 - Uninstall or Disable Unnecessary Services on Enterprise Assets and Software
- v7: 9.2 - Ensure Only Approved Ports, Protocols and Services Are Running