Siemens Automation License Manager (ALM) before 5.3 SP3 allows remote attackers to write to files, rename files, create directories, or delete directories via crafted packets.
https://ics-cert.us-cert.gov/advisories/ICSA-16-287-02
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-284342.pdf