Date: Fri, 3 Dec 2021 12:24:32 +0100 From: Oswald Buddenhagen <oswald.buddenhagen@....de> To: isync-devel@...ts.sourceforge.net Cc: oss-security@...ts.openwall.com Subject: CVE-2021-3657: multiple buffer overflows in isync/mbsync description: A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (>=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email senders, could cause several different buffer overflows, which could conceivably be exploited for remote code execution. mitigation: upgrade to the freshly released v1.4.4 available from https://sourceforge.net/projects/isync/files/isync/ , or apply the matching attached patch. note that while a patch for v1.3.x is provided, no upstream release will be made any more. details: i'm not sure it's actually possible to pull off RCE with these. a non-server attacker would be additionally impaired by message size limitations and being unable to predict the exact size of the headers stored in the box, so they would likely need an account on the same liberally configured system, apart from knowing to target mbsync. View attachment "CVE-2021-3657-buffer-overflows-on-big-1.4.patch" of type "text/x-diff" (7190 bytes) View attachment "CVE-2021-3657-buffer-overflows-on-big-1.3.patch" of type "text/x-diff" (5489 bytes)
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