[ASA-202106-27] isync: arbitrary code execution

[Jonas Witschel]

Arch Linux Security Advisory ASA-202106-27
==========================================

Severity: Medium
Date    : 2021-06-09
CVE-ID  : CVE-2021-3578
Package : isync
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-2042

Summary
=======

The package isync before version 1.4.2-1 is vulnerable to arbitrary
code execution.

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.

Workaround
==========

None.

Description
===========

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.

Impact
======

A remote server could cause arbitrary code execution on the mbsync
client using a crafted APPENDUID response.

References
==========

https://sourceforge.net/p/isync/mailman/message/37297759/
https://sourceforge.net/p/isync/isync/ci/589d2ed4283130108df5495b5510d822282e1300/
https://security.archlinux.org/CVE-2021-3578
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