Title

Global initialization files must contain the mesg -n or mesg n commands. (Cat III impact)

Discussion

If the mesg -n or mesg n command is not placed into the system profile, messaging can be used to cause a Denial of Service attack.

Check Content

Check global initialization files for the presence of "mesg -n" or "mesg n". Procedure: # grep mesg /etc/.login /etc/profile /etc/bashrc /etc/environment /etc/security/environ /etc/csh.login /etc/csh.cshrc If no existing global initialization files contain "mesg -n" or "mesg n", this is a finding.

Fix Text

Edit /etc/profile or another global initialization script and add the mesg -n command.

Additional Identifiers

Rule ID: SV-220087r603266_rule

Vulnerability ID: V-220087

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.