isync is vulnerable to directory traversal. The vulnerability exists as validations of the mailbox names returned by IMAP LIST/LSUB do not occur allowing a malicious or compromised server to use specially crafted mailbox names containing ..
path components to access data outside the designated mailbox on the opposite end of the synchronization channel.
bugzilla.redhat.com/show_bug.cgi?id=1928963
lists.debian.org/debian-lts-announce/2022/07/msg00001.html
lists.fedoraproject.org/archives/list/[email protected]/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ/
lists.fedoraproject.org/archives/list/[email protected]/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW/
security-tracker.debian.org/tracker/CVE-2021-20247
www.openwall.com/lists/oss-security/2021/02/22/1