plugins/acl/acl-backend-vfile.c in Dovecot 1.2.x before 1.2.15 and
2.0.x before 2.0.5 interprets an ACL entry as a directive to add to
the permissions granted by another ACL entry, instead of a directive
to replace the permissions granted by another ACL entry, in certain
circumstances involving the private namespace of a user, which allows
remote authenticated users to bypass intended access restrictions via
a request to read or modify a mailbox.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[dovecot] 20101002 ACL handling bugs in v1.2.8+ and v2.0
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