Title

TOSS must restrict exposed kernel pointer addresses access. (Cat II impact)

Discussion

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors.

Check Content

Verify TOSS restricts exposed kernel pointer addresses access with the following commands: $ sudo sysctl kernel.kptr_restrict kernel.kptr_restrict = 1 If the returned line does not have a value of "1", or a line is not returned, this is a finding.

Fix Text

Configure TOSS to restrict exposed kernel pointer addresses access by adding the following line to a file in the "/etc/sysctl.d" directory: kernel.kptr_restrict = 1 The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command: $ sudo sysctl --system

Additional Identifiers

Rule ID: SV-253132r991589_rule

Vulnerability ID: V-253132

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

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