CVE-2013-6920 Information

Description

Siemens SINAMICS S/G controllers with firmware before 4.6.11 do not require authentication for FTP and TELNET sessions which allows remote attackers to bypass intended access restrictions via TCP traffic to port (1) 21 or (2) 23.

Reference

http://ics-cert.us-cert.gov/advisories/ICSA-13-338-01 http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-742938.pdf https://cert-portal.siemens.com/productcert/pdf/ssa-742938.pdf