CVE-2020-27534: Path Traversal
First published: Wed Dec 30 2020(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Docker Docker | <19.03.9 | |
| go/github.com/moby/moby | <19.03.9 | 19.03.9 |
| go/github.com/docker/docker | <19.03.9 | 19.03.9 |
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Reference Links
- 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
- https://access.redhat.com/security/cve/cve-2020-27534
- https://bugzilla.redhat.com/show_bug.cgi?id=1921154
- https://nvd.nist.gov/vuln/detail/CVE-2020-27534
- https://github.com/advisories/GHSA-6hwg-w5jg-9c6x (Advisory)
- http://web.archive.org/web/20200530054359/https://docs.docker.com/engine/release-notes
Frequently Asked Questions
What is CVE-2020-27534?
CVE-2020-27534 is a vulnerability in Docker Engine before version 19.03.9 that could potentially allow an attacker to construct a potentially unsafe temporary pathname.
What is the severity of CVE-2020-27534?
The severity of CVE-2020-27534 is medium, with a severity value of 5.3.
Which software versions are affected by CVE-2020-27534?
Docker Engine versions up to, but excluding, 19.03.9 are affected by CVE-2020-27534.
How can I fix CVE-2020-27534?
To fix CVE-2020-27534, it is recommended to update Docker Engine to version 19.03.9 or newer.
Where can I find more information about CVE-2020-27534?
More information about CVE-2020-27534 can be found in the Docker Engine release notes and the GitHub pull requests related to this vulnerability.
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