CVE-2023-34236

CVE-2023-34236 is a high-severity security vulnerability in github.com/weaveworks/tf-controller (go), affecting versions < 0.14.4. It is fixed in 0.14.4, 0.15.0-rc.5.

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Summary

Weave GitOps Terraform Controller Information Disclosure Vulnerability

Workarounds

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.

References

For More Information

If you have any further questions or comments about this advisory:

Open an issue in the Weave GitOps Terraform Controller repository
Email us at [email protected]

Impact

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.

CVE-2023-34236 has a CVSS score of 8.5 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.14.4, 0.15.0-rc.5); upgrading removes the vulnerable code path.

Affected versions

github.com/weaveworks/tf-controller (< 0.14.4) github.com/weaveworks/tf-controller (>= 0.15.0-rc.1, < 0.15.0-rc.5)

Security releases

github.com/weaveworks/tf-controller → 0.14.4 (go) github.com/weaveworks/tf-controller → 0.15.0-rc.5 (go)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

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.

The patches for this vulnerability are found in:

  • this commit: 9708fda28ccd0466cb0a8fd409854ab4d92f7dca
  • this commit: 6323b355bd7f5d2ce85d0244fe0883af3881df4e
  • this commit: 28282bc644054e157c3b9a3d38f1f9551ce09074
  • and this commit: 98a0688036e9dbcf43fa84960d9a1ef3e09a69cf

Frequently Asked Questions

  1. What is CVE-2023-34236? CVE-2023-34236 is a high-severity security vulnerability in github.com/weaveworks/tf-controller (go), affecting versions < 0.14.4. It is fixed in 0.14.4, 0.15.0-rc.5.
  2. How severe is CVE-2023-34236? CVE-2023-34236 has a CVSS score of 8.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
  3. Which versions of github.com/weaveworks/tf-controller are affected by CVE-2023-34236? github.com/weaveworks/tf-controller (go) versions < 0.14.4 is affected.
  4. Is there a fix for CVE-2023-34236? Yes. CVE-2023-34236 is fixed in 0.14.4, 0.15.0-rc.5. Upgrade to this version or later.
  5. Is CVE-2023-34236 exploitable, and should I be worried? Whether CVE-2023-34236 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
  6. What actually determines whether CVE-2023-34236 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
  7. How do I fix CVE-2023-34236?
    • Upgrade github.com/weaveworks/tf-controller to 0.14.4 or later
    • Upgrade github.com/weaveworks/tf-controller to 0.15.0-rc.5 or later

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