CVE-2021-3578

HIGH

mbsync <1.3.6, 1.4.2 - RCE

Title source: llm

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.

References (9)

[Mailing List, Patch, Third Party Advisory] http://www.openwall.com/lists/oss-security/2021/06/07/1

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U75UFEWRAZYKVL5NHMPBUOLWN3WXTOEI/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPIDLIJKNRJHUVBCL7QGAPAAVPIHQGXK/

[Not Applicable] https://bugzilla.redhat.com/show_bug.cgi?id=1961710

[Not Applicable] https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/

[Issue Tracking, Patch, Third Party Advisory] https://bugzilla.redhat.com/show_bug.cgi?id=1967397

[Mailing List, Patch, Third Party Advisory] https://www.openwall.com/lists/oss-security/2021/06/07/1

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html

[Third Party Advisory] https://security.gentoo.org/glsa/202208-15

Scores

CVSS v3 7.8

EPSS 0.0192

EPSS Percentile 83.4%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-704

Status published

Products (6)

debian/debian_linux 9.0

fedoraproject/fedora 33

fedoraproject/fedora 34

isync_project/isync 1.4.0

isync_project/isync 1.4.1

isync_project/isync < 1.3.6

Published Feb 16, 2022

Tracked Since Feb 18, 2026