Vulnerability · Published Jul 29, 2020 · Assigned by canonical

CVE-2020-11933local snapd exploit through cloud-init

High 7.3

In plain English

A high-severity security flaw in core from Canonical. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.2%top 87.8% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 products (as reported)

Vendor	Product	Versions
Canonical	snapd	2.45.2 – before 2.45.2, revision 8539
Canonical	core	2.45.2 – before 2.45.2, revision 9659

Weakness: CWE-264 · Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

References

https://launchpad.net/bugs/1879530 x_refsource_CONFIRM
https://ubuntu.com/USN-4424-1 x_refsource_CONFIRM