Permissions, Privileges, and Access Controls in docker (Alpine package)



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-21284
CWE-ID CWE-264
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 docker (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

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 update from vendor's website.

Vulnerable software versions

docker (Alpine package): 20.10.2-r0

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=e278e390a25855d568389be4d87d8e7328f90d71
https://git.alpinelinux.org/aports/commit/?id=b6492956611e628ca5b96716fcb3fd20727d993d


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.



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