CVE-2023-34236: Weave GitOps Terraform Controller (aka Weave TF-controller) is a controller for Flux to reconcile Terraform resources in a GitOps way. A vulnerability...

Description

Weave GitOps Terraform Controller (aka Weave TF-controller) is a controller for Flux to reconcile Terraform resources in a GitOps way. A vulnerability has been identified in Weave GitOps Terraform Controller which could allow an authenticated remote attacker to view sensitive information. This vulnerability stems from Weave GitOps Terraform Runners (`tf-runner`), where sensitive data is inadvertently printed - potentially revealing sensitive user data in their pod logs. In particular, functions `tfexec.ShowPlan`, `tfexec.ShowPlanRaw`, and `tfexec.Output` are implicated when the `tfexec` object set its `Stdout` and `Stderr` to be `os.Stdout` and `os.Stderr`. An unauthorized remote attacker could exploit this vulnerability by accessing these prints of sensitive information, which may contain configurations or tokens that could be used to gain unauthorized control or access to resources managed by the Terraform controller. A successful exploit could allow the attacker to utilize this sensitive data, potentially leading to unauthorized access or control of the system. This vulnerability has been addressed in Weave GitOps Terraform Controller versions `v0.14.4` and `v0.15.0-rc.5`. Users are urged to upgrade to one of these versions to mitigate the vulnerability. As a temporary measure until the patch can be applied, users can add the environment variable `DISABLE_TF_LOGS` to the tf-runners via the runner pod template of the Terraform Custom Resource. This will prevent the logging of sensitive information and mitigate the risk of this vulnerability.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.71%

48.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions	Update
Weave	Gitops Terraform Controller	< 0.14.4	—
Weave	Gitops Terraform Controller	0.15.0	Rc1

References

https://github.com/weaveworks/tf-controller/commit/28282bc644054e157c3b9a3d38f1f9551ce09074Patch
https://github.com/weaveworks/tf-controller/commit/6323b355bd7f5d2ce85d0244fe0883af3881df4ePatch
https://github.com/weaveworks/tf-controller/commit/9708fda28ccd0466cb0a8fd409854ab4d92f7dcaPatch
https://github.com/weaveworks/tf-controller/commit/98a0688036e9dbcf43fa84960d9a1ef3e09a69cfPatch
https://github.com/weaveworks/tf-controller/issues/637Exploit, Issue Tracking
https://github.com/weaveworks/tf-controller/issues/649Exploit, Issue Tracking, Patch
https://github.com/weaveworks/tf-controller/security/advisories/GHSA-6hvv-j432-23cvPatch, Third Party Advisory
https://github.com/weaveworks/tf-controller/commit/28282bc644054e157c3b9a3d38f1f9551ce09074Patch
https://github.com/weaveworks/tf-controller/commit/6323b355bd7f5d2ce85d0244fe0883af3881df4ePatch
https://github.com/weaveworks/tf-controller/commit/9708fda28ccd0466cb0a8fd409854ab4d92f7dcaPatch
https://github.com/weaveworks/tf-controller/commit/98a0688036e9dbcf43fa84960d9a1ef3e09a69cfPatch
https://github.com/weaveworks/tf-controller/issues/637Exploit, Issue Tracking
https://github.com/weaveworks/tf-controller/issues/649Exploit, Issue Tracking, Patch
https://github.com/weaveworks/tf-controller/security/advisories/GHSA-6hvv-j432-23cvPatch, Third Party Advisory

Timeline

Published: Jul 14, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-34236?

Weave GitOps Terraform Controller (aka Weave TF-controller) is a controller for Flux to reconcile Terraform resources in a GitOps way. A vulnerability has been identified in Weave GitOps Terraform Controller which could allow an authenticated remote attacker to view sensitive information. This vulnerability stems from Weave GitOps Terraform Runners (`tf-runner`), where sensitive data is inadvertently printed - potentially revealing sensitive user data in their pod logs. In particular, functions `tfexec.ShowPlan`, `tfexec.ShowPlanRaw`, and `tfexec.Output` are implicated when the `tfexec` object set its `Stdout` and `Stderr` to be `os.Stdout` and `os.Stderr`. An unauthorized remote attacker could exploit this vulnerability by accessing these prints of sensitive information, which may contain configurations or tokens that could be used to gain unauthorized control or access to resources managed by the Terraform controller. A successful exploit could allow the attacker to utilize this sensitive data, potentially leading to unauthorized access or control of the system. This vulnerability has been addressed in Weave GitOps Terraform Controller versions `v0.14.4` and `v0.15.0-rc.5`. Users are urged to upgrade to one of these versions to mitigate the vulnerability. As a temporary measure until the patch can be applied, users can add the environment variable `DISABLE_TF_LOGS` to the tf-runners via the runner pod template of the Terraform Custom Resource. This will prevent the logging of sensitive information and mitigate the risk of this vulnerability.

How severe is CVE-2023-34236?

CVE-2023-34236 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2023-34236?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.