CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AI Score
Confidence
High
EPSS
Percentile
39.7%
A bug was found in Moby (Docker Engine) where containers were incorrectly started with non-empty inheritable Linux process capabilities, creating an atypical Linux environment and enabling programs with inheritable file capabilities to elevate those capabilities to the permitted set during execve(2)
. Normally, when executable programs have specified permitted file capabilities, otherwise unprivileged users and processes can execute those programs and gain the specified file capabilities up to the bounding set. Due to this bug, containers which included executable programs with inheritable file capabilities allowed otherwise unprivileged users and processes to additionally gain these inheritable file capabilities up to the container’s bounding set. Containers which use Linux users and groups to perform privilege separation inside the container are most directly impacted.
This bug did not affect the container security sandbox as the inheritable set never contained more capabilities than were included in the container’s bounding set.
This bug has been fixed in Moby (Docker Engine) 20.10.14. Users should update to this version as soon as possible. Running containers should be stopped, deleted, and recreated for the inheritable capabilities to be reset.
This fix changes Moby (Docker Engine) behavior such that containers are started with a more typical Linux environment. Refer to capabilities(7)
for a description of how capabilities work. Note that permitted file capabilities continue to allow for privileges to be raised up to the container’s bounding set and that processes may add capabilities to their own inheritable set up to the container’s bounding set per the rules described in the manual page. In all cases the container’s bounding set provides an upper bound on the capabilities that can be assumed and provides for the container security sandbox.
The entrypoint of a container can be modified to use a utility like capsh(1)
to drop inheritable capabilities prior to the primary process starting.
The Moby project would like to thank Andrew G. Morgan for responsibly disclosing this issue in accordance with the Moby security policy.
If you have any questions or comments about this advisory:
www.openwall.com/lists/oss-security/2022/05/12/1
github.com/moby/moby
github.com/moby/moby/commit/2bbc786e4c59761d722d2d1518cd0a32829bc07f
github.com/moby/moby/commit/7f375bcff41ce672cd61e9a31f3eeb2966e3dbe1
github.com/moby/moby/releases/tag/v20.10.14
github.com/moby/moby/security/advisories/GHSA-2mm7-x5h6-5pvq
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6PMQKCAPK2AR3DCYITJYMMNBEGQBGLCC
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5AFKOQ5CE3CEIULWW4FLQKHFFU6FSYG
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5FQJ3MLFSEKQYCFPFZIKYGBXPZUJFVY
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPOJUJZXGMIVKRS4QR75F6OIXNQ6LDBL
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HIMAHZ6AUIKN7AX26KHZYBXVECIOVWBH
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQCVS7WBFSTKJFNX5PGDRARMTOFWV2O7
lists.fedoraproject.org/archives/list/[email protected]/message/6PMQKCAPK2AR3DCYITJYMMNBEGQBGLCC
lists.fedoraproject.org/archives/list/[email protected]/message/A5AFKOQ5CE3CEIULWW4FLQKHFFU6FSYG
lists.fedoraproject.org/archives/list/[email protected]/message/A5FQJ3MLFSEKQYCFPFZIKYGBXPZUJFVY
lists.fedoraproject.org/archives/list/[email protected]/message/FPOJUJZXGMIVKRS4QR75F6OIXNQ6LDBL
lists.fedoraproject.org/archives/list/[email protected]/message/HIMAHZ6AUIKN7AX26KHZYBXVECIOVWBH
lists.fedoraproject.org/archives/list/[email protected]/message/HQCVS7WBFSTKJFNX5PGDRARMTOFWV2O7
nvd.nist.gov/vuln/detail/CVE-2022-24769
security.gentoo.org/glsa/202401-31
www.debian.org/security/2022/dsa-5162
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AI Score
Confidence
High
EPSS
Percentile
39.7%