1.3.3 Ensure cryptographic mechanisms are used to protect the integrity of audit tools

Information

Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators.

Protecting the integrity of the tools used for auditing purposes is a critical step toward ensuring the integrity of audit information. Audit information includes all information (e.g., audit records, audit settings, and audit reports) needed to successfully audit information system activity.

Attackers may replace the audit tools or inject code into the existing tools with the purpose of providing the capability to hide or erase system activity from the audit logs.

Audit tools should be cryptographically signed in order to provide the capability to identify when the audit tools have been modified, manipulated, or replaced. An example is a checksum hash of the file or files.

Solution

Add or update the following selection lines for to a file ending inconf in the /etc/aide.conf.d/ directory or to /etc/aide.conf to protect the integrity of the audit tools:

# Audit Tools
/sbin/auditctl p+i+n+u+g+s+b+acl+xattrs+sha512
/sbin/auditd p+i+n+u+g+s+b+acl+xattrs+sha512
/sbin/ausearch p+i+n+u+g+s+b+acl+xattrs+sha512
/sbin/aureport p+i+n+u+g+s+b+acl+xattrs+sha512
/sbin/autrace p+i+n+u+g+s+b+acl+xattrs+sha512
/sbin/augenrules p+i+n+u+g+s+b+acl+xattrs+sha512

See Also

https://workbench.cisecurity.org/files/4230

Item Details

Category: SYSTEM AND INFORMATION INTEGRITY

References: 800-53|SI-7

Plugin: Unix

Control ID: a52264f9c46c588ac6eefcf884c0798af74f3431400f9b96b920bea758fedb48