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GHSA-6x6c-w9w9-hv4h
github.com/infracost/infracostImpact
Sensitive information exposure in the Infracost Terraform Cloud/Enterprise integration. Several code paths attached a configured secret token to a request whose host was taken straight from the scanned Terraform, with no check that the host was the trusted endpoint.
The condition that matters is whether a Terraform Cloud/Enterprise (or registry) token is present in the run: if one is, the injected hostname can disclose it. Impact therefore depends on the trigger. Under on: pull_request (the only configuration in Infracost's documentation) fork pull requests run without secrets, so no token is present. It only reaches token disclosure under pull_request_target, a same-repository pull request, or another CI setup that provides the token alongside untrusted Terraform, and exploiting an untrusted fork pull request also typically needs a maintainer to approve the workflow run. The patch scopes the token to the trusted host regardless of trigger.
Patches
Fixed in v0.10.45 (#3590) by attaching a token only when the destination host matches the configured trusted host; otherwise Infracost refuses to send it and skips remote variable loading
- Installed via the official script, a package manager, or the
latestDocker tag: upgrade tov0.10.45(or later) to receive the fix. - Pinned to a specific version or image digest: bump to
v0.10.45.
Workarounds
No full fix without upgrading. To limit exposure: use on: pull_request rather than pull_request_target, pin organization, workspace, and host in Infracost config so the .tf hostname is ignored, and keep Terraform Cloud and registry tokens out of runs that process untrusted pull request content.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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