CVE-2020-11933

local snapd exploit through cloud-init

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices was run without restrictions on every boot, which a physical attacker could exploit by crafting cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass intended security mechanisms such as full disk encryption. This issue did not affect traditional Ubuntu systems. Fixed in snapd version 2.45.2, revision 8539 and core version 2.45.2, revision 9659.

cloud-init administrado por snapd en los dispositivos Ubuntu Core 16 y Ubuntu Core 18, se ejecutó sin restricciones en cada arranque, que un atacante físico podría explotar mediante el diseño de user-data/meta-data de cloud-init por medio de medios externos para llevar a cabo cambios arbitrarios en el dispositivo para omitir los mecanismos de seguridad previstos, como el cifrado de disco completo. Este problema no afectó a los sistemas tradicionales de Ubuntu. Se corrigió en snapd versión 2.45.2, revisión 8539 y core versión 2.45.2, revisión 9659

*Credits: Ian Johnson

CVSS Scores

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-04-20 CVE Reserved
2020-07-15 CVE Published
2023-04-14 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-264: Permissions, Privileges, and Access Controls

CAPEC

References (2)

URL	Tag	Source
https://launchpad.net/bugs/1879530	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://ubuntu.com/USN-4424-1	2021-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Canonical Search vendor "Canonical"		Snapd Search vendor "Canonical" for product "Snapd"				< 2.45.2 Search vendor "Canonical" for product "Snapd" and version " < 2.45.2"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				19.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04"		lts		Affected