Title

The system must be checked weekly for unauthorized setgid files as well as unauthorized modification to authorized setgid files. (Cat II impact)

Discussion

Files with the setgid bit set will allow anyone running these files to be temporarily assigned the group id of the file. While many system files depend on these attributes for proper operation, security problems can result if setgid is assigned to programs that allow reading and writing of files, or shell escapes.

Check Content

NOTE: This will virtually always require a manual review. Determine if a weekly automated or manual process is used to generate a list of sgid files on the system and compare it with the prior list. If no such process is in place, this is a finding.

Fix Text

Establish a weekly automated or manual process to generate a list of sgid files on the system and compare it with the prior list. To create a list of sgid files: # find / -type f -perm -2000 -exec ls -lL {} \; >> sgid-file-list

Additional Identifiers

Rule ID: SV-38473r1_rule

Vulnerability ID: V-804

Group Title: GEN002460

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.