Title

The file integrity tool must be configured to verify extended attributes. (Cat III impact)

Discussion

Extended attributes in file systems are used to contain arbitrary data and file metadata with security implications.

Check Content

Verify the file integrity tool is configured to verify extended attributes. Check to see if Advanced Intrusion Detection Environment (AIDE) is installed with the following command: # dpkg -l |grep aide ii aide 0.16~a2.git20130520-3 ii aide-common 0.16~a2.git20130520-3 If AIDE is not installed, ask the System Administrator how file integrity checks are performed on the system. If there is no application installed to perform integrity checks, this is a finding. Note: AIDE is highly configurable at install time. These commands assume the "aide.conf" file is under the "/etc" directory. Use the following command to determine if the file is in another location: # find / -name aide.conf Check the "aide.conf" file to determine if the "xattrs" rule has been added to the rule list being applied to the files and directories selection lists with the following command: # egrep "[+]?xattrs" /etc/aide/aide.conf VarFile = OwnerMode+n+l+X+xattrs If the "xattrs" rule is not being used on all selection lines in the "/etc/aide.conf" file, or extended attributes are not being checked by another file integrity tool, this is a finding.

Fix Text

Configure the file integrity tool to check file and directory extended attributes. If AIDE is installed, ensure the "xattrs" rule is present on all file and directory selection lists.

Additional Identifiers

Rule ID: SV-214985r610931_rule

Vulnerability ID: V-214985

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

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