CVE Vulnerabilities

CVE-2020-5906

Incorrect Default Permissions

Published: Jul 01, 2020 | Modified: Jan 27, 2023
CVSS 3.x
8.1
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS 2.x
5.5 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:N
RedHat/V2
RedHat/V3
Ubuntu

In versions 13.1.0-13.1.3.3, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, the BIG-IP system does not properly enforce the access controls for the scp.blacklist files. This allows Admin and Resource Admin users with Secure Copy (SCP) protocol access to read and overwrite blacklisted files via SCP.

Weakness

During installation, installed file permissions are set to allow anyone to modify those files.

Affected Software

Name Vendor Start Version End Version
Big-ip_access_policy_manager F5 11.6.1 (including) 11.6.5 (including)
Big-ip_access_policy_manager F5 12.1.0 (including) 12.1.5 (including)
Big-ip_access_policy_manager F5 13.1.0 (including) 13.1.3 (including)
Big-ip_advanced_firewall_manager F5 11.6.1 (including) 11.6.5 (including)
Big-ip_advanced_firewall_manager F5 12.1.0 (including) 12.1.5 (including)
Big-ip_advanced_firewall_manager F5 13.1.0 (including) 13.1.3 (including)
Big-ip_analytics F5 11.6.1 (including) 11.6.5 (including)
Big-ip_analytics F5 12.1.0 (including) 12.1.5 (including)
Big-ip_analytics F5 13.1.0 (including) 13.1.3 (including)
Big-ip_application_acceleration_manager F5 11.6.1 (including) 11.6.5 (including)
Big-ip_application_acceleration_manager F5 12.1.0 (including) 12.1.5 (including)
Big-ip_application_acceleration_manager F5 13.1.0 (including) 13.1.3 (including)
Big-ip_application_security_manager F5 11.6.1 (including) 11.6.5 (including)
Big-ip_application_security_manager F5 12.1.0 (including) 12.1.5 (including)
Big-ip_application_security_manager F5 13.1.0 (including) 13.1.3 (including)
Big-ip_domain_name_system F5 11.6.1 (including) 11.6.5 (including)
Big-ip_domain_name_system F5 12.1.0 (including) 12.1.5 (including)
Big-ip_domain_name_system F5 13.1.0 (including) 13.1.3 (including)
Big-ip_fraud_protection_service F5 11.6.1 (including) 11.6.5 (including)
Big-ip_fraud_protection_service F5 12.1.0 (including) 12.1.5 (including)
Big-ip_fraud_protection_service F5 13.1.0 (including) 13.1.3 (including)
Big-ip_global_traffic_manager F5 11.6.1 (including) 11.6.5 (including)
Big-ip_global_traffic_manager F5 12.1.0 (including) 12.1.5 (including)
Big-ip_global_traffic_manager F5 13.1.0 (including) 13.1.3 (including)
Big-ip_link_controller F5 11.6.1 (including) 11.6.5 (including)
Big-ip_link_controller F5 12.1.0 (including) 12.1.5 (including)
Big-ip_link_controller F5 13.1.0 (including) 13.1.3 (including)
Big-ip_local_traffic_manager F5 11.6.1 (including) 11.6.5 (including)
Big-ip_local_traffic_manager F5 12.1.0 (including) 12.1.5 (including)
Big-ip_local_traffic_manager F5 13.1.0 (including) 13.1.3 (including)
Big-ip_policy_enforcement_manager F5 11.6.1 (including) 11.6.5 (including)
Big-ip_policy_enforcement_manager F5 12.1.0 (including) 12.1.5 (including)
Big-ip_policy_enforcement_manager F5 13.1.0 (including) 13.1.3 (including)

Potential Mitigations

  • Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
  • Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

References