CVE-2020-12510

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Summary

CVECVE-2020-12510
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-11-19 18:15:00 UTC
Updated2020-12-03 16:47:00 UTC
DescriptionThe 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.

Risk And Classification

Problem Types: CWE-276

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Beckhoff Twincat Extended Automation Runtime 3.1 All All All
Application Beckhoff Twincat Extended Automation Runtime 3.1 All All All

References

ReferenceSourceLinkTags
Beckhoff: Privilege Escalation through TwinCat System Tray (TcSysUI.exe) — English (USA) CONFIRM cert.vde.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Ayushman Dutta reported the issue to CERT@VDE

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