6.8 Medium
CVSS3
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
7 High
AI Score
Confidence
Low
2.7 Low
CVSS2
Access Vector
ADJACENT_NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:A/AC:L/Au:S/C:N/I:P/A:N
0.0005 Low
EPSS
Percentile
15.8%
When using --userns-remap
, if the root user in the remapped namespace has access to the host filesystem they can modify files under /var/lib/docker/<remapping>
that cause writing files with extended privileges.
Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.
Maintainers would like to thank Alex Chapman for discovering the vulnerability; @awprice, @nathanburrell, @raulgomis, @chris-walz, @erin-jensby, @bassmatt, @mark-adams, @dbaxa for working on it and Zac Ellis for responsibly disclosing it to [email protected]
CPE | Name | Operator | Version |
---|---|---|---|
github.com/moby/moby | lt | 20.10.3 | |
github.com/moby/moby | lt | 19.3.15 |
docs.docker.com/engine/release-notes/#20103
github.com/advisories/GHSA-7452-xqpj-6rpc
github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c
github.com/moby/moby/releases/tag/v19.03.15
github.com/moby/moby/releases/tag/v20.10.3
github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc
nvd.nist.gov/vuln/detail/CVE-2021-21284
security.gentoo.org/glsa/202107-23
security.netapp.com/advisory/ntap-20210226-0005/
www.debian.org/security/2021/dsa-4865
6.8 Medium
CVSS3
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
7 High
AI Score
Confidence
Low
2.7 Low
CVSS2
Access Vector
ADJACENT_NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:A/AC:L/Au:S/C:N/I:P/A:N
0.0005 Low
EPSS
Percentile
15.8%