Privilege escalation in Canonical Ltd. Snapd
CVE-2020-27352
When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result systemd will move processes from the containers created and managed by these snaps into the cgroup of the main daemon within the snap itself when reloading system units. This may grant additional privileges to a container within the snap that were not originally intended.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (16.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Canonical Ltd. Snapd — versions 0
- Canonical Snapd
- Canonical Ubuntu Linux — versions 16.04, 18.04, 20.04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.launchpad.net/snapd/+bug/1910456 (issue-tracking, Exploit, Issue Tracking)
- ubuntu.com/security/notices/USN-4728-1 (vendor-advisory, Vendor Advisory)
- www.cve.org/CVERecord (issue-tracking, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27352?
- CVE-2020-27352 is a critical-severity vulnerability in Canonical Ltd. Snapd, classified under Improper Privilege Management. CVSS score: 9.3/10. Published 2024-06-21.
- How severe is CVE-2020-27352?
- Critical severity. CVSS v3 base score is 9.3 out of 10.
- Is CVE-2020-27352 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.