GEN001390 - The /etc/passwd file must not have an extended ACL.

Information

File system ACLs can provide access to files beyond what is allowed by the mode numbers of the files. The /etc/passwd file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification.

Solution

Remove the extended ACL from the /etc/passwd file and disable extended permissions.
#acledit /etc/passwd

See Also

http://iasecontent.disa.mil/stigs/zip/U_STIG_Library_2015_07.zip