Bug 1967397 (CVE-2021-3578) - CVE-2021-3578 isync: unchecked pointer cast may lead to remote code execution
Summary: CVE-2021-3578 isync: unchecked pointer cast may lead to remote code execution
Alias: CVE-2021-3578
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1968626 1968627
Blocks: 1967404
TreeView+ depends on / blocked
Reported: 2021-06-03 06:01 UTC by Marian Rehak
Modified: 2021-06-07 21:04 UTC (History)
3 users (show)

Fixed In Version: isync 1.3.6, isync 1.4.2
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2021-06-07 21:04:02 UTC

Attachments (Terms of Use)
fix for isync 1.3 (3.11 KB, application/mbox)
2021-06-03 06:04 UTC, Marian Rehak
no flags Details
fix isync 1.4 (3.09 KB, application/mbox)
2021-06-03 06:10 UTC, Marian Rehak
no flags Details

Description Marian Rehak 2021-06-03 06:01:30 UTC
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.

Comment 1 Marian Rehak 2021-06-03 06:04:26 UTC
Created attachment 1788788 [details]
fix for isync 1.3

Comment 2 Marian Rehak 2021-06-03 06:10:40 UTC
Created attachment 1788789 [details]
fix isync 1.4

Comment 4 msiddiqu 2021-06-07 17:09:28 UTC
Created isync tracking bugs for this issue:

Affects: epel-all [bug 1968627]
Affects: fedora-all [bug 1968626]

Comment 5 Product Security DevOps Team 2021-06-07 21:04:02 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

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