Path Traversal in Docker
CVE-2020-27534
util/binfmt_misc/check.go in Builder in Docker Engine before 19.03.9 calls os.OpenFile with a potentially unsafe qemu-check temporary pathname, constructed with an empty first argument in an ioutil.TempDir call.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.018 (77.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/moby/buildkit/pull/1462 (Third Party Advisory)
- github.com/moby/moby/pull/40877 (Third Party Advisory)
- web.archive.org/web/20200530054359/https://docs.docker.com/engine/release-notes/ (Third Party Advisory, Release Notes)
- golang.org/pkg/io/ioutil/ (Third Party Advisory)
- golang.org/pkg/os/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27534?
- CVE-2020-27534 is a medium-severity vulnerability in Docker, classified under Path Traversal. CVSS score: 5.3/10. Published 2020-12-30.
- How severe is CVE-2020-27534?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2020-27534 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.