CVE Vulnerabilities

CVE-2020-8472

Incorrect Permission Assignment for Critical Resource

Published: Apr 29, 2020 | Modified: May 14, 2020
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
6.8 MEDIUM
AV:L/AC:L/Au:N/C:P/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu

Insufficient folder permissions used by system functions in ABB System 800xA products OPCServer for AC800M (versions 6.0 and earlier) and Control Builder M Professional, MMSServer for AC800M, Base Software for SoftControl (version 6.1 and earlier) allow low privileged users to read, modify, add and delete system and application files. An authenticated attacker who successfully exploited the vulnerabilities could escalate his/her privileges, cause system functions to stop and to corrupt user applications.

Weakness

The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.

Affected Software

Name Vendor Start Version End Version
Control_builder_m Abb * 6.1 (including)
Mms_server Abb * 6.1 (including)
Opc_server Abb * 6.0 (including)

Potential Mitigations

  • Run the code in a “jail” or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
  • OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
  • This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
  • Be careful to avoid CWE-243 and other weaknesses related to jails.

References