The eCryptfs support utilities (ecryptfs-utils) 73-0ubuntu6.1 on Ubuntu 9.04 stores the mount passphrase in installation logs, which might allow local users to obtain access to the filesystem by reading the log files from disk. NOTE: the log files are only readable by root.
https://exchange.xforce.ibmcloud.com/vulnerabilities/51191
https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-1294
http://www.ubuntu.com/usn/usn-783-1