Isync 0.4 before 1.0.6, does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.
https://exchange.xforce.ibmcloud.com/vulnerabilities/82232
http://www.securityfocus.com/bid/57423
http://www.openwall.com/lists/oss-security/2013/02/20/9
http://sourceforge.net/projects/isync/files/isync/1.0.6/
http://sourceforge.net/p/isync/isync/ci/914ede18664980925628a9ed2a73ad05f85aeedb
http://security.gentoo.org/glsa/glsa-201310-02.xml
http://secunia.com/advisories/55190
http://lists.fedoraproject.org/pipermail/package-announce/2013-March/099547.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-March/099544.html