The core.exportVariable
function uses a well known delimiter that attackers can use to break out of that specific variable and assign values to other arbitrary variables. Workflows that write untrusted values to the GITHUB_ENV
file may cause the path or other environment variables to be modified without the intention of the workflow or action author.
Users should upgrade to @actions/core v1.9.1
.
If you are unable to upgrade the @actions/core
package, you can modify your action to ensure that any user input does not contain the delimiter _GitHubActionsFileCommandDelimeter_
before calling core.exportVariable
.
More information about setting-an-environment-variable in workflows
If you have any questions or comments about this advisory:
* Open an issue in actions/toolkit
{ "nvd_published_at": "2022-08-15T11:21:00Z", "github_reviewed_at": "2022-08-18T19:01:36Z", "severity": "MODERATE", "github_reviewed": true, "cwe_ids": [ "CWE-74", "CWE-77" ] }