A vulnerability has been identified in SIMATIC CP 1543-1 (All versions < V2.0.28), SIPLUS NET CP 1543-1 (All versions < V2.0.28). Users with elevated privileges to TIA-Portal and project data on the engineering station could possibly get privileged access on affected devices.
https://ics-cert.us-cert.gov/advisories/ICSA-16-327-01
https://cert-portal.siemens.com/productcert/pdf/ssa-672373.pdf
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-672373.pdf