PT-2022-1924 · Canonical+3 · Snapd+4

Published 2022-02-17 · Updated 2022-04-26 · CVE-2021-44730

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions snapd versions 2.54.2 through 2.54.3+18.04 snapd versions 2.54.2 through 2.54.3+20.04 snapd versions 2.54.2 through 2.54.3+21.10.1

Description The issue is related to a hardlinking error in the snap-confine binary of the snapd utility. A local attacker can exploit this by creating a hardlink to the binary, allowing them to execute arbitrary binaries and gain privilege escalation.

Recommendations For snapd versions 2.54.2, update to version 2.54.3+18.04 or later. For snapd versions prior to 2.54.3+20.04, update to version 2.54.3+20.04 or later. For snapd versions prior to 2.54.3+21.10.1, update to version 2.54.3+21.10.1 or later. As a temporary workaround, consider restricting access to the snap-confine binary to minimize the risk of exploitation.

Fix

Link Following

Weakness Enumeration

CWE-59

CWE-62

Related Identifiers

ALT-PU-2022-1345

ALT-PU-2022-1765

BDU:2022-01460

CVE-2021-44730

DSA-5080-1

USN-5292-1

USN-5292-2

USN-5292-3

USN-5292-4

Affected Products

Alt Linux

Linuxmint

Red Os

Ubuntu

Snapd

References · 35

• https://nvd.nist.gov/vuln/detail/CVE-2021-44730 · Security Note
• https://osv.dev/vulnerability/USN-5292-3 · Vendor Advisory
• https://osv.dev/vulnerability/USN-5292-2 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-5292-3 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-44730 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-44730 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-4120 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-5292-2 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5080-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-01460 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-44730 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-44730 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-5292-1 · Vendor Advisory