CVE-2021-21285: Docker daemon crash during image pull of malicious image
First published: Tue Feb 02 2021(Updated: )
### Impact Pulling an intentionally malformed Docker image manifest crashes the `dockerd` daemon. ### Patches Versions 20.10.3 and 19.03.15 contain patches that prevent the daemon from crashing. ### Credits Maintainers would like to thank Josh Larsen, Ian Coldwater, Duffie Cooley, Rory McCune for working on the vulnerability and Brad Geesaman for responsibly disclosing it to security@docker.com.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/docker.io | 18.09.1+dfsg1-7.1+deb10u3 20.10.5+dfsg1-1+deb11u2 20.10.24+dfsg1-1 20.10.25+dfsg1-2 | |
| go/github.com/moby/moby | >=20.10.0-beta1<20.10.3 | 20.10.3 |
| go/github.com/moby/moby | <19.3.15 | 19.3.15 |
| Docker | <19.03.15 | |
| Docker | >=20.0.0<20.10.3 | |
| Debian Debian Linux | =10.0 | |
| NetApp E-Series SANtricity OS Controller | >=11.0<=11.60.3 | |
| IBM InfoSphere Guardium z/OS | <=10.5 | |
| IBM InfoSphere Guardium z/OS | <=10.6 | |
| IBM InfoSphere Guardium z/OS | <=11.0 | |
| IBM InfoSphere Guardium z/OS | <=11.1 | |
| IBM InfoSphere Guardium z/OS | <=11.2 | |
| IBM InfoSphere Guardium z/OS | <=11.3 |
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Reference Links
- https://docs.docker.com/engine/release-notes/#20103
- https://github.com/moby/moby/commit/8d3179546e79065adefa67cc697c09d0ab137d30
- https://github.com/moby/moby/releases/tag/v19.03.15
- https://github.com/moby/moby/releases/tag/v20.10.3
- https://github.com/moby/moby/security/advisories/GHSA-6fj5-m822-rqx8
- https://security.gentoo.org/glsa/202107-23
- https://security.netapp.com/advisory/ntap-20210226-0005/
- https://www.debian.org/security/2021/dsa-4865
- https://github.com/moby/moby/commit/420b1d36250f9cfdc561f086f25a213ecb669b6f
- https://security-tracker.debian.org/tracker/CVE-2021-21285
- https://exchange.xforce.ibmcloud.com/vulnerabilities/196049
- https://www.ibm.com/support/pages/node/6455281 (Advisory)
- https://nvd.nist.gov/vuln/detail/CVE-2021-21285
- https://github.com/advisories/GHSA-6fj5-m822-rqx8 (Advisory)
- https://security.netapp.com/advisory/ntap-20210226-0005
Frequently Asked Questions
What is CVE-2021-21285?
CVE-2021-21285 is a vulnerability in Docker that allows a remote attacker to cause a denial of service by crashing the dockerd daemon.
How does CVE-2021-21285 work?
CVE-2021-21285 is caused by improper input validation in Docker. By tricking a victim into pulling a specially-crafted Docker image, the attacker can crash the dockerd daemon and cause a denial of service.
Which versions of Docker are affected by CVE-2021-21285?
Docker versions up to and excluding 19.03.15 and versions between 20.0.0 and 20.10.3 are affected by CVE-2021-21285.
How severe is CVE-2021-21285?
CVE-2021-21285 has a severity rating of 6.5, which is considered medium.
How can I fix CVE-2021-21285?
To fix CVE-2021-21285, update Docker to version 19.03.15 or higher if using a version prior to 20. And update to version 20.10.3 or higher if using a version between 20.0.0 and 20.10.3.
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