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hackeroneJupenurH1:1625652
HistoryJul 05, 2022 - 10:31 a.m.

GitHub: Delimiter injection in GitHub Actions core.exportVariable

2022-07-0510:31:43
jupenur
hackerone.com
$4617
18
github
actions
toolkit
delimiter
injection
security
upgrade
cve-2022-35954
bug bounty
remote code execution

0.001 Low

EPSS

Percentile

19.4%

The GitHub Actions ToolKit provides a set of packages to make creating actions easier. 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.
CVE-2022-35954
Poor delimiter handling in @actions/core led to a remote attacker being able to define arbitrary environment variables. In a separate report, #1637621, remote code execution in the GitHub Actions runner enabled by this bug was demonstrated.

0.001 Low

EPSS

Percentile

19.4%