Vulnerability CVE-2020-27534
Published: 2020-12-30   Modified: 2020-12-31

Description:
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.

Type:

CWE-22

 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Docker -> Docker 

 References:
http://web.archive.org/web/20200530054359/https://docs.docker.com/engine/release-notes/
https://github.com/moby/buildkit/pull/1462
https://github.com/moby/moby/pull/40877
https://golang.org/pkg/io/ioutil/#TempDir
https://golang.org/pkg/os/#TempDir
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