Check: RHEL-09-213080
RHEL 9 STIG:
RHEL-09-213080
(in versions v1 r3 through v1 r2)
Title
RHEL 9 must restrict usage of ptrace to descendant processes. (Cat II impact)
Discussion
Unrestricted usage of ptrace allows compromised binaries to run ptrace on other processes of the user. Like this, 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). Satisfies: SRG-OS-000132-GPOS-00067, SRG-OS-000480-GPOS-00227
Check Content
Verify RHEL 9 restricts usage of ptrace to descendant processes with the following commands: $ 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. Check that the configuration files are present to enable this kernel parameter. $ sudo /usr/lib/systemd/systemd-sysctl --cat-config | egrep -v '^(#|;)' | grep -F kernel.yama.ptrace_scope| tail -1 kernel.yama.ptrace_scope = 1 If the network parameter "kernel.yama.ptrace_scope" is not equal to "1", or nothing is returned, this is a finding.
Fix Text
Configure RHEL 9 to restrict usage of 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 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-257811r942979_rule
Vulnerability ID: V-257811
Group Title: SRG-OS-000132-GPOS-00067
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000366 |
The organization implements the security configuration settings. |
| CCI-001082 |
The information system separates user functionality (including user interface services) from information system management functionality. |