Provide references for CVE-2013-6920.
Where can I find more information about CVE-2013-6920?
References are available at: 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.