ArchLinux: 202106-27: isync: arbitrary code execution
Summary
A security issue was found in mbsync before version 1.4.2, where an unchecked pointer cast allows a malicious or compromised server to write an arbitrary integer value past the end of a heap-allocated structure by issuing an unexpected APPENDUID response. This could be plausibly exploited for remote code execution on the client.
Resolution
Upgrade to 1.4.2-1.
# pacman -Syu "isync>=1.4.2-1"
The problem has been fixed upstream in version 1.4.2.
References
https://sourceforge.net/p/isync/mailman/message/37297759/ https://sourceforge.net/p/isync/isync/ci/589d2ed4283130108df5495b5510d822282e1300/ https://security.archlinux.org/CVE-2021-3578
Workaround
None.