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XCCDF
Guide to the Secure Configuration of Red Hat Enterprise Linux 7
System Settings
File Permissions and Masks
Verify Permissions on Important Files and Directories
Ensure All SGID Executables Are Authorized
Ensure All SGID Executables Are Authorized
An XCCDF Rule
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Ensure All SGID Executables Are Authorized
Medium Severity
The SGID (set group id) bit should be set only on files that were installed via authorized means. A straightforward means of identifying unauthorized SGID files is determine if any were not installed as part of an RPM package, which is cryptographically verified. Investigate the origin of any unpackaged SGID files. This configuration check considers authorized SGID 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 SGID file not deployed through an RPM will be flagged for further review.