CVE-2021-20247

HIGH

mbsync < 1.3.5 - Path Traversal via IMAP Mailbox Name

Title source: llm

Description

A flaw was found in mbsync before v1.3.5 and v1.4.1. Validations of the mailbox names returned by IMAP LIST/LSUB do not occur allowing a malicious or compromised server to use specially crafted mailbox names containing '..' path components to access data outside the designated mailbox on the opposite end of the synchronization channel. The highest threat from this vulnerability is to data confidentiality and integrity.

References (6)

Core 6

Core References

Issue Tracking, Third Party Advisory x_refsource_misc

https://bugzilla.redhat.com/show_bug.cgi?id=1928963

Exploit, Mailing List, Third Party Advisory x_refsource_misc

https://www.openwall.com/lists/oss-security/2021/02/22/1

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ/

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW/

Mailing List, Third Party Advisory mailing-list x_refsource_mlist

https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html

Third Party Advisory vendor-advisory x_refsource_gentoo

https://security.gentoo.org/glsa/202208-15

Scores

CVSS v3 7.4

EPSS 0.0188

EPSS Percentile 76.8%

Attack Vector NETWORK

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

Details

CWE

CWE-20 CWE-22

Status published

Products (5)

debian/debian_linux 9.0

fedoraproject/extra_packages_for_enterprise_linux 8.0

fedoraproject/fedora 32

fedoraproject/fedora 33

mbsync_project/mbsync < 1.3.5

Published Feb 23, 2021

Tracked Since Feb 18, 2026