CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS
Percentile
46.8%
The actions runner invokes the docker cli directly in order to run job containers, service containers, or container actions. A bug in the logic for how the environment is encoded into these docker commands was discovered that allows an input to escape the environment variable and modify that docker command invocation directly. Jobs that use container actions, job containers, or service containers alongside untrusted user inputs in environment variables may be vulnerable.
The Actions Runner has been patched, both on github.com
and hotfixes for GHES and GHAE customers. Please update to one of the following versions of the runner:
GHES and GHAE customers may want to patch their instance in order to have their runners automatically upgrade to these new runner versions.
You may want to consider removing any container actions, job containers, or service containers from your jobs until you are able to upgrade your runner versions.
If you have any questions or comments about this advisory: