Directory traversal vulnerability in the ManageSieve implementation in Dovecot 1.0.15, 1.1, and 1.2 allows remote attackers to read and modify arbitrary .sieve files via a ".." (dot dot) in a script name.
https://exchange.xforce.ibmcloud.com/vulnerabilities/46672
http://www.vupen.com/english/advisories/2008/3190
http://www.ubuntu.com/usn/USN-838-1
http://www.securityfocus.com/bid/32582
http://www.dovecot.org/list/dovecot/2008-November/035259.html