Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Beckhoff | Twincat Extended Automation Runtime | 3.1 |
Related Weaknesses (CWE)
References
- https://cert.vde.com/en-us/advisories/vde-2020-037Third Party Advisory
- https://cert.vde.com/en-us/advisories/vde-2020-037Third Party Advisory
FAQ
What is CVE-2020-12510?
CVE-2020-12510 is a vulnerability with a CVSS score of 7.3 (HIGH). 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...
How severe is CVE-2020-12510?
CVE-2020-12510 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-12510?
Check the references section above for vendor advisories and patch information. Affected products include: Beckhoff Twincat Extended Automation Runtime.