CVEvulnerability

CVE-2021-20247

7.4 HIGH Published 2021-02-23 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-02-23
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.4 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 2.0 ([email protected])
5.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:N
Weaknesses
CWE-20, CWE-22

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.

Affected configurations

• mbsync project mbsync (< 1.3.5) • mbsync project mbsync (>= 1.4.0 < 1.4.1) • fedoraproject extra packages for enterprise linux 8.0 • debian debian linux 9.0 • fedoraproject fedora 32 • fedoraproject fedora 33

Related

Weakness · CWE (2)

  • CWE-20 Improper Input Validation weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness

References