attack vector is local; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products
Phoenix Contact PLCnext Engineer
Classified as
CWE-494 (Download of Code Without Integrity Check)
Affected Products, Subsystems & Sectors
Vendor
Product
Affected Versions
Patch Status
Phoenix Contact
PLCnext Engineer
Subsystems
General OT
Sectors
Multiple
What to Know
The PFI plugin framework deploys executable assemblies (DLLs) from a signed plugin package into the local plugin repository and loads them via reflection, but the deployment routine processes archive entries that were never covered by the signature verification. An unauthenticated local attacker can replace an unsigned DLL outside the signed prefix in the archive passes verification and overwrites the legitimate signed assembly at the same destination path. The plugin loader then instantiates the attacker-supplied code without any additional integrity check resulting in a full compromise of the affected systems. (NVD)
What to Do
Monitor Phoenix Contact's web page for any future patch releases. See vendor advisory link below.