Vulnerability Report

CVE-2021-44731

RCE

Title: Canonical Snapd RCE

RCE

Proof Of Concept

PoC Available for CVE-2021-44731

CWE Category CWE-362
Published Date Feb 17, 2022
Modified Date Nov 21, 2024
Exploit Status Available
Score 7.8 CVSS v3.1
Exploit Probability (EPSS)
0.95%

Vulnerability Summary

CVE-2021-44731: 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

Impacted Vendors

S
snapcraft 1
C
canonical 1

Reference Links

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 http://www.openwall.com/lists/oss-security/2022/02/23/1 http://www.openwall.com/lists/oss-security/2022/02/23/2 http://www.openwall.com/lists/oss-security/2022/11/30/2 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/ https://ubuntu.com/security/notices/USN-5292-1 https://www.debian.org/security/2022/dsa-5080 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 http://www.openwall.com/lists/oss-security/2022/02/23/1 http://www.openwall.com/lists/oss-security/2022/02/23/2 http://www.openwall.com/lists/oss-security/2022/11/30/2 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/ https://ubuntu.com/security/notices/USN-5292-1 https://www.debian.org/security/2022/dsa-5080
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.8
Attack Vector
LOCAL
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.8
Attack Vector
LOCAL
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
6.9
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:L/AC:M/Au:N/C:C/I:C/A:C

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-44731 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/deeexcee-io/CVE-2021-44731-snap-confine-SUID
View Code
MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector LOCAL
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Stack

No specific products linked.