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V-282509

CAT II (Medium)

TOSS 5 must restrict usage of ptrace to descendant processes.

Rule ID

SV-282509r1200507_rule

STIG

Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-001082

Discussion

Unrestricted usage of ptrace allows compromised binaries to run ptrace on other processes of the user. This way, the attacker can steal sensitive information from the target processes (e.g., SSH sessions, web browser, etc.) without any additional assistance from the user (i.e., without resorting to phishing).

Check Content

Verify TOSS 5 restricts usage of ptrace to descendant processes using the following command:

$ sudo sysctl kernel.yama.ptrace_scope

kernel.yama.ptrace_scope = 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 5 to restrict using ptrace to descendant processes by adding the following line to a file, in the "/etc/sysctl.d" directory:

kernel.yama.ptrace_scope = 1

The system configuration files must be reloaded for the changes to take effect. To reload the contents of the files, run the following command:

$ sudo sysctl --system