GHSA-65rg-554r-9j5x
lychee link checking action affected by arbitrary code injection in composite action
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| GitHub Actions | lycheeverse/lychee-action | < 2.0.2 | 2.0.2 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Summary
There is a potential attack of arbitrary code injection vulnerability in `lychee-setup` of the composite action at *action.yml*.
### Details
The GitHub Action variable `inputs.lycheeVersion` can be used to execute arbitrary code in the context of the action.
### PoC
```yaml
- uses: lycheeverse/lychee@v2
with:
lycheeVersion: $(printenv >> $GITHUB_STEP_SUMMARY && echo "v0.16.1")
```
The previous example will just print all the environment variables to the summary of the workflow, but an attacker could potentially use this vector to compromise the security of the target repository, even passing unnotice because the action will run normally.
### Impact
Low
References
External links from the advisory. They lead to third-party sites.