The Ubuntu operating system library files must have mode 0755 or less permissive.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-219198	UBTU-18-010133	SV-219198r508662_rule		Medium

Description
If the operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

Description

If the operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

STIG	Date
Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide	2020-09-10

Details

Check Text ( C-20923r304922_chk )
Verify the system-wide shared library files contained in the directories "/lib", "/lib64" and "/usr/lib" have mode 0755 or less permissive. Check that the system-wide shared library files have mode 0755 or less permissive with the following command: # sudo find /lib /lib64 /usr/lib -perm /022 -type f -exec stat -c "%n %a" '{}' \; /usr/lib64/pkcs11-spy.so If any files are found to be group-writable or world-writable, this is a finding.

Check Text ( C-20923r304922_chk )

Verify the system-wide shared library files contained in the directories "/lib", "/lib64" and "/usr/lib" have mode 0755 or less permissive.

Check that the system-wide shared library files have mode 0755 or less permissive with the following command:

# sudo find /lib /lib64 /usr/lib -perm /022 -type f -exec stat -c "%n %a" '{}' \;
/usr/lib64/pkcs11-spy.so

If any files are found to be group-writable or world-writable, this is a finding.

Fix Text (F-20922r304923_fix)
Configure the library files to be protected from unauthorized access. Run the following command: # sudo find /lib /lib64 /usr/lib -perm /022 -type f -exec chmod 755 '{}' \;