`docker cp` allows unexpected chmod of host files
CVE-2021-41089

2.8LOW

Key Information:

Vendor

Moby

Status
Moby
Vendor
CVE Published:
4 October 2021

What is CVE-2021-41089?

Moby is an open-source project created by Docker to enable software containerization. A bug was found in Moby (Docker Engine) where attempting to copy files using docker cp into a specially-crafted container can result in Unix file permission changes for existing files in the host’s filesystem, widening access to others. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. This bug has been fixed in Moby (Docker Engine) 20.10.9. Users should update to this version as soon as possible. Running containers do not need to be restarted.

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Deploy the Patch

Affected Version(s)

moby < 20.10.9

References

https://github.com/moby/moby/security/advisories/GHSA-v99...
x_refsource_CONFIRM
https://github.com/moby/moby/commit/bce32e5c93be4caf1a592...
x_refsource_MISC
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisoryx_refsource_FEDORA

CVSS V3.1

Score:
2.8
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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