CVE-2022-35954 Delimiter injection vulnerability in @actions/core exportVariable
Attackers can inject delimiters to modify environment variables, potentially leading to privilege escalation or code execution in GitHub Actions workflows.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-35954?
CVE-2022-35954 is a medium-severity code injection vulnerability in actions toolkit, published on 13 Aug 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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`.
Which versions are affected by CVE-2022-35954?
2 open source packages ship an affected version, including @actions/core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@actions/core npm | All versions | 1.9.1 |
@actions/core npm | All versions | 1.9.1 |
Products include Github Toolkit.
How do I fix CVE-2022-35954?
Upgrade @actions/core to 1.9.1 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2022-35954 being exploited?
There is no known exploitation of CVE-2022-35954 in the wild and no public exploit code.
Sources
Also known as GHSA-7r3h-m5j6-3q42.