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


Finding ID Version Rule ID IA Controls Severity
V-238347 UBTU-20-010426 SV-238347r654216_rule Medium
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.
Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide 2022-12-06


Check Text ( C-41557r654214_chk )
Verify the system-wide shared library files contained in the directories "/lib", "/lib64", and "/usr/lib" 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" '{}' \;

If any files are found to be group-writable or world-writable, this is a finding.
Fix Text (F-41516r654215_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 '{}' \;