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CVE-2020-11933

local snapd exploit through cloud-init

MEDIUM
6.8
CVSS Score
Published: July 29, 2020 at 04:25 PM UTC
Updated: June 17, 2026 at 02:51 AM UTC
3 products affected across 2 vendorsUbuntu LinuxSnapdUbuntu Core

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Severity
MEDIUM6.8
Exploit prediction
EPSS 0.2%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
16.0418.0419.1020.04
Snapd· Snapcraft
95%
v < 2.45.22.45.2 ≤ v < 2.45.2, revision 85392.45.2
Affected range stops below 2.45.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.45.2, revision 8539, so it looks safe — our inference, not a vendor statement
Ubuntu Core· Canonical
60%
2.45.2 ≤ v < 2.45.2, revision 96592.45.2
Affected range stops below 2.45.2, revision 9659, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://launchpad.net/bugs/1879530
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://ubuntu.com/USN-4424-1

CVSS

6.8MEDIUM[email protected]
Attack Vector
PHYSICAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-264NVD-CWE-Other

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