Headline
GHSA-v994-f8vw-g7j4: `docker cp` allows unexpected chmod of host files in Moby Docker Engine
Impact
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.
Patches
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.
Workarounds
Ensure you only run trusted containers.
Credits
The Moby project would like to thank Lei Wang and Ruizhi Xiao for responsibly disclosing this issue in accordance with the Moby security policy.
For more information
If you have any questions or comments about this advisory:
- Open an issue
- Email us at [email protected] if you think you’ve found a security bug
Package
gomod github.com/docker/docker (Go)
Affected versions
< 20.10.9
Patched versions
20.10.9
Description
Impact
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.
Patches
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.
Workarounds
Ensure you only run trusted containers.
Credits
The Moby project would like to thank Lei Wang and Ruizhi Xiao for responsibly disclosing this issue in accordance with the Moby security policy.
For more information
If you have any questions or comments about this advisory:
- Open an issue
- Email us at [email protected] if you think you’ve found a security bug
References
- GHSA-v994-f8vw-g7j4
- https://nvd.nist.gov/vuln/detail/CVE-2021-41089
- moby/moby@bce32e5
- https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
- https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB
- https://lists.fedoraproject.org/archives/list/[email protected]/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB
thaJeztah published to moby/moby
Oct 4, 2021
Published by the National Vulnerability Database
Oct 4, 2021
Published to the GitHub Advisory Database
Jun 10, 2024
Reviewed
Jun 10, 2024
Last updated
Jun 10, 2024
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