Multiple vulnerabilities in Docker



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-21284
CVE-2021-21285
CWE-ID CWE-264
CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Docker
Server applications / Virtualization software

Vendor Docker Inc.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU50273

Risk: Medium

CVSSv4.0: 6.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-21284

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions when using the --userns-remap option. A remote authenticated attacker on the local network can send a specially crafted request and gain elevated privileges as root on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Docker: before 19.03.15

CPE2.3 External links

https://docs.docker.com/engine/release-notes/#20103
https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c
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-7452-xqpj-6rpc


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Resource exhaustion

EUVDB-ID: #VU50274

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-21285

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trick a victim to pull a specially crafted Docker image, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Docker: before 19.03.15

CPE2.3 External 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


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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