Check: UBTU-20-010438
Canonical Ubuntu 20.04 LTS STIG:
UBTU-20-010438
(in versions v1 r12 through v1 r1)
Title
The Ubuntu operating system's Advance Package Tool (APT) must be configured to prevent the installation of patches, service packs, device drivers, or Ubuntu operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization. (Cat II impact)
Discussion
Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor. Accordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization. Verifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This ensures the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.
Check Content
Verify that APT is configured to prevent the installation of patches, service packs, device drivers, or Ubuntu operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization. Check that the "AllowUnauthenticated" variable is not set at all or is set to "false" with the following command: $ grep AllowUnauthenticated /etc/apt/apt.conf.d/* /etc/apt/apt.conf.d/01-vendor-Ubuntu:APT::Get::AllowUnauthenticated "false"; If any of the files returned from the command with "AllowUnauthenticated" are set to "true", this is a finding.
Fix Text
Configure APT to prevent the installation of patches, service packs, device drivers, or Ubuntu operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization. Remove/update any APT configuration files that contain the variable "AllowUnauthenticated" to "false", or remove "AllowUnauthenticated" entirely from each file. Below is an example of setting the "AllowUnauthenticated" variable to "false": APT::Get::AllowUnauthenticated "false";
Additional Identifiers
Rule ID: SV-238359r877463_rule
Vulnerability ID: V-238359
Group Title: SRG-OS-000366-GPOS-00153
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001749 |
The information system prevents the installation of organization-defined software components without verification the software component has been digitally signed using a certificate that is recognized and approved by the organization. |
Controls
Number | Title |
---|---|
CM-5 (3) |
Signed Components |