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cis-apache-12.3

DevOps & Security
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Ensure the Apache AppArmor Profile Is in Enforce Mode

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Ensure the Apache AppArmor Profile Is in Enforce Mode

Description

AppArmor profiles may be in one of three modes: disabled, complain, or enforce. In the complain mode, any violations of the access controls are logged but the restrictions are not enforced. Also, once a profile mode has been changed, it is recommended to restart the Apache server, otherwise the currently running process may not be confined by the policy.

Rationale

The complain mode is useful for testing and debugging a profile but is not appropriate for production. Only the confined process running in enforce mode will prevent attacks that violate the configured access controls.

Impact

None documented

Audit Procedure

Perform the following steps to determine if the recommended state is implemented:

Use the aa-unconfined command to check that the apache2 policy is enforced, and that the currently running apache2 processes are confined. The output should include both confined by and (enforce).

# aa-unconfined --paranoid | grep apache2
1899 /usr/sbin/apache2 confined by '/usr/sbin/apache2 (enforce)'
1902 /usr/sbin/apache2 confined by '/usr/sbin/apache2 (enforce)'
1903 /usr/sbin/apache2 confined by '/usr/sbin/apache2 (enforce)'
. . .

Note that non-compliant results may include not confined or (complain), such as the following:

3304 /usr/sbin/apache2 not confined
2502 /usr/sbin/apache2 confined by '/usr/sbin/apache2 (complain)'
4004 /usr/sbin/apache2 confined by
'/usr/sbin/apache2//HANDLING_UNTRUSTED_INPUT (complain)'

Remediation

Perform the following to implement the recommended state:

  1. Set the profile state to enforce mode.
# aa-enforce /usr/sbin/apache2
# /etc/init.d/apparmor reload

Default Value

The default Apache profile is very permissive.

References

  1. https://wiki.ubuntu.com/AppArmor

CIS Controls

Version 6

2 Inventory of Authorized and Unauthorized Software Inventory of Authorized and Unauthorized Software

Version 7

14.7 Enforce Access Control to Data through Automated Tools Use an automated tool, such as host-based Data Loss Prevention, to enforce access controls to data even when data is copied off a system.

Profile

Level 2 | Scored