CVE Vulnerability

CVE-2020-12510

The default installation path of the TwinCAT XAR 3.1 software in all versions is underneath C:TwinCAT. If the directory does not exist it and further subdirectories are created with permissions which allow every local user to modify the content. The default installation registers TcSysUI.exe for automatic execution upon log in of a user. If a less privileged user has a local account he or she can replace TcSysUI.exe. It will be executed automatically by another user during login. This is also true for users with administrative access. Consequently, a less privileged user can trick a higher privileged user into executing code he or she modified this way. By default Beckhoff’s IPCs are shipped with TwinCAT software installed this way and with just a single local user configured. Thus the vulnerability exists if further less privileged users have been added.

6 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 6.8 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

7.3 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 1.3 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://cert.vde.com/en-us/advisories/vde-2020-037 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:beckhoff:twincat_extended_automation_runtime:3.1:*:*:*:*:*:*:*
Information

Published : 2020-11-19 06:15

Updated : 2020-12-03 04:47

NVD link : CVE-2020-12510

Mitre link : CVE-2020-12510

Products Affected
No products.
CWE
CWE-276

Incorrect Default Permissions