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XCCDF
Guide to the Secure Configuration of Alibaba Cloud Linux 3
System Settings
File Permissions and Masks
Verify Permissions on Important Files and Directories
Ensure All SUID Executables Are Authorized
Ensure All SUID Executables Are Authorized
An XCCDF Rule
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Ensure All SUID Executables Are Authorized
Medium Severity
The SUID (set user id) bit should be set only on files that were installed via authorized means. A straightforward means of identifying unauthorized SUID files is determine if any were not installed as part of an RPM package, which is cryptographically verified. Investigate the origin of any unpackaged SUID files. This configuration check considers authorized SUID files those which were installed via RPM. It is assumed that when an individual has sudo access to install an RPM and all packages are signed with an organizationally-recognized GPG key, the software should be considered an approved package on the system. Any SUID file not deployed through an RPM will be flagged for further review.