Eucalyptus before 2.0.3 and Eucalyptus EE before 2.0.2, as used in Ubuntu Enterprise Cloud (UEC) and other products, do not properly interpret signed elements in SOAP requests, which allows man-in-the-middle attackers to execute arbitrary commands by modifying a request, related to an "XML Signature Element Wrapping" or a "SOAP signature replay" issue.
https://launchpad.net/ubuntu/+source/eucalyptus/+changelog
https://exchange.xforce.ibmcloud.com/vulnerabilities/67670
https://bugs.launchpad.net/bugs/746101
http://www.ubuntu.com/usn/USN-1137-1
http://www.securityfocus.com/bid/48000
http://secunia.com/advisories/44705