Arch Linux Security Advisory ASA-202102-38 ========================================== Severity: High Date : 2021-02-27 CVE-ID : CVE-2021-20247 Package : isync Type : directory traversal Remote : Yes Link : https://security.archlinux.org/AVG-1598 Summary ======= The package isync before version 1.3.5-1 is vulnerable to directory traversal. Resolution ========== Upgrade to 1.3.5-1. # pacman -Syu "isync>=1.3.5-1" The problem has been fixed upstream in version 1.3.5. Workaround ========== None. Description =========== A security issue was found in isync/mbsync before versions 1.3.5 and 1.4.1. 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. Impact ====== A compromised server could traverse files on the system. References ========== https://www.openwall.com/lists/oss-security/2021/02/22/1 https://sourceforge.net/p/isync/isync/ci/fe5d59f8e3169944e57eb1c60155c9ebd49... https://security.archlinux.org/CVE-2021-20247