Radicale before 1.1 allows remote authenticated users to bypass owner_write and owner_only limitations via regex metacharacters in the user name, as demonstrated by ".*".
https://github.com/Unrud/Radicale/commit/4bfe7c9f7991d534c8b9fbe153af9d341f925f98
https://github.com/Kozea/Radicale/pull/341
http://www.securityfocus.com/bid/80255
http://www.openwall.com/lists/oss-security/2016/01/06/4
http://www.openwall.com/lists/oss-security/2016/01/05/7
http://www.debian.org/security/2016/dsa-3462
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175776.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175738.html