CVE-2021-44731

CVSS V2 Medium 6.9 CVSS V3 High 7.8

Description

A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

Overview

CVE ID
CVE-2021-44731

Assigner
security@ubuntu.com

Vulnerability Status
Analyzed

Published Version
2022-02-17T23:15:07

Last Modified Date
2023-02-03T21:21:09

Weakness Enumerations

CWE	URL
CWE-362	http://cwe.mitre.org/data/definitions/362.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version End
cpe:2.3:a:canonical:snapd::::::::	1	OR	2.54.2
cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::	1	OR
cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts:::	1	OR
cpe:2.3:o:canonical:ubuntu_linux:21.10:::::::*	1	OR
cpe:2.3:o:fedoraproject:fedora:34:::::::*	1	OR
cpe:2.3:o:fedoraproject:fedora:35:::::::*	1	OR
cpe:2.3:o:debian:debian_linux:10.0:::::::*	1	OR
cpe:2.3:o:debian:debian_linux:11.0:::::::*	1	OR

CVSS Version 2

Version
2.0

Vector String
AV:L/AC:M/Au:N/C:C/I:C/A:C

Access Vector
LOCAL

Access Compatibility
MEDIUM

Authentication
NONE

Confidentiality Impact
COMPLETE

Integrity Impact
COMPLETE

Availability Impact
COMPLETE

Base Score
6.9

Severity
MEDIUM

Exploitability Score
3.4

Impact Score
10

CVSS Version 3

Version
3.1

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

Attack Vector
LOCAL

Attack Compatibility
HIGH

Privileges Required
LOW

User Interaction
NONE

Scope
CHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
7.8

Base Severity
HIGH

Exploitability Score
1.1

Impact Score
6

References

Reference URL	Reference Tags
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html
http://seclists.org/fulldisclosure/2022/Dec/4
http://www.openwall.com/lists/oss-security/2022/02/18/2	Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/02/23/1	Exploit Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/02/23/2	Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/11/30/2	Exploit Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/	Mailing List Third Party Advisory
https://ubuntu.com/security/notices/USN-5292-1	Patch Vendor Advisory
https://www.debian.org/security/2022/dsa-5080	Issue Tracking Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-44731
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44731

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 15:47:57				Added to TrackCVE
2022-12-06 10:04:54	2022-02-17T23:15Z	2022-02-17T23:15:07	CVE Published Date	updated
2022-12-06 10:04:54		2022-12-01T01:15:10	CVE Modified Date	updated
2022-12-06 10:04:54		Undergoing Analysis	Vulnerability Status	updated
2022-12-06 10:05:00			References	updated
2022-12-07 17:13:34		2022-12-07T17:08:46	CVE Modified Date	updated
2022-12-07 17:13:34	Undergoing Analysis	Analyzed	Vulnerability Status	updated
2022-12-09 05:22:05		2022-12-09T05:15:12	CVE Modified Date	updated
2022-12-09 05:22:05	Analyzed	Modified	Vulnerability Status	updated
2022-12-09 05:22:08			References	updated
2022-12-09 18:20:04		2022-12-09T17:15:11	CVE Modified Date	updated
2022-12-09 18:20:06			References	updated
2022-12-12 18:15:16	Modified	Undergoing Analysis	Vulnerability Status	updated
2023-02-03 22:13:28		2023-02-03T21:21:09	CVE Modified Date	updated
2023-02-03 22:13:28	Undergoing Analysis	Analyzed	Vulnerability Status	updated