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Date: Mon, 7 Jun 2021 13:46:43 +0200
From: Oswald Buddenhagen <oswald.buddenhagen@....de>
To: isync-devel@...ts.sourceforge.net
Cc: oss-security@...ts.openwall.com
Subject: CVE-2021-3578: possible remote code execution in isync/mbsync
description:
A flaw was found in mbsync before v1.3.6 and v1.4.2, 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.
mitigation:
upgrade to the freshly released v1.3.6 or v1.4.2 available from
https://sourceforge.net/projects/isync/files/isync/ , or apply the
matching attached patch.
credit:
This problem was found by Lukas Braun <koomi@...hbit.net> using a
fuzzer.
View attachment "fix-handling-of-unexpected-APPENDUID-response-code--1.3.patch" of type "text/x-diff" (3187 bytes)
View attachment "fix-handling-of-unexpected-APPENDUID-response-code--1.4.patch" of type "text/x-diff" (3167 bytes)
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