PT-2021-13854 · Mbsync+1 · Mbsync+1

Pedro Sampaio · Published 2021-02-23 · Updated 2024-06-15 · CVE-2021-20247

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: mbsync versions prior to 1.3.5 and 1.4.1

Description: A flaw was found in mbsync where 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.

Recommendations: For mbsync versions prior to 1.3.5, update to version 1.3.5 or later. For mbsync versions prior to 1.4.1, update to version 1.4.1 or later. As a temporary workaround, consider restricting access to the IMAP LIST/LSUB functionality until a patch is available.

Exploit

Fix

RCE

Path traversal

Weakness Enumeration

CWE-20

CWE-22

Related Identifiers

CVE-2021-20247

DLA-3066-1

OPENSUSE-SU-2021:0516-1

OPENSUSE-SU-2021:0533-1

OPENSUSE-SU-2021_0516-1

OPENSUSE-SU-2024:10866-1

Affected Products

Suse

Mbsync

References · 29

• 🔥 https://openwall.com/lists/oss-security/2021/02/22/1 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-20247 · Security Note
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:0533-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-20247 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:0516-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-20247 · Security Note
• https://osv.dev/vulnerability/DLA-3066-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:10866-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-20247 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-20247 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-20247 · Vendor Advisory
• https://security.gentoo.org/glsa/202208-15 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-20247 · Vendor Advisory