CVE-2021-20247

Severity Score

7.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se encontró un fallo en mbsync versiones anteriores a v1.3.5 y v1.4.1. Las comprobaciones de los nombres de buzones devueltos por IMAP LIST/LSUB no ocurren, permitiendo a un servidor malicioso o comprometido utilizar nombres de buzones especialmente diseñados que contengan componentes de ruta ".." para acceder a datos fuera del buzón designado en el extremo opuesto del canal de sincronización. La mayor amenaza de esta vulnerabilidad es la confidencialidad e integridad de los datos

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-17 CVE Reserved
2021-02-23 CVE Published
2024-04-26 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-20: Improper Input Validation
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CAPEC

References (6)

URL	Tag	Source
https://bugzilla.redhat.com/show_bug.cgi?id=1928963	Issue Tracking
https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html	Mailing List

URL	Date	SRC
https://www.openwall.com/lists/oss-security/2021/02/22/1	2024-08-03

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CAXQLCK35QGRCRENRTGKJO4VVZGUXUJJ	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDEBZQJMWDW5JFK4NTHH6DAFNAZTESW	2023-11-07
https://security.gentoo.org/glsa/202208-15	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mbsync Project Search vendor "Mbsync Project"		Mbsync Search vendor "Mbsync Project" for product "Mbsync"				< 1.3.5 Search vendor "Mbsync Project" for product "Mbsync" and version " < 1.3.5"		-		Affected
Mbsync Project Search vendor "Mbsync Project"		Mbsync Search vendor "Mbsync Project" for product "Mbsync"				>= 1.4.0 < 1.4.1 Search vendor "Mbsync Project" for product "Mbsync" and version " >= 1.4.0 < 1.4.1"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Extra Packages For Enterprise Linux Search vendor "Fedoraproject" for product "Extra Packages For Enterprise Linux"				8.0 Search vendor "Fedoraproject" for product "Extra Packages For Enterprise Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected