Weave GitOps Terraform Controller up to 0.14.3/0.15.0-rc.4 tfexec.ShowPlan/tfexec.ShowPlanRaw/tfexec.Output log file

Summaryinfo

A vulnerability classified as problematic was found in Weave GitOps Terraform Controller up to 0.14.3/0.15.0-rc.4. Impacted is the function tfexec.ShowPlan/tfexec.ShowPlanRaw/tfexec.Output. Such manipulation leads to log file. This vulnerability is documented as CVE-2023-34236. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Weave GitOps Terraform Controller up to 0.14.3/0.15.0-rc.4. It has been rated as problematic. Affected by this issue is the function tfexec.ShowPlan/tfexec.ShowPlanRaw/tfexec.Output. The manipulation with an unknown input leads to a log file vulnerability. Using CWE to declare the problem leads to CWE-532. Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information. Impacted is confidentiality. CVE summarizes:

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.

The weakness was released 07/15/2023 as 637. The advisory is available at github.com. This vulnerability is handled as CVE-2023-34236 since 05/31/2023. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 0.14.4 or 0.15.0-rc.5 eliminates this vulnerability. Applying the patch 28282bc644054e157c3b9a3d38f1f9551ce09074 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• Weave

Name

• GitOps Terraform Controller

Version

• 0.14.0
• 0.14.1
• 0.14.2
• 0.14.3
• 0.15.0-rc.0
• 0.15.0-rc.1
• 0.15.0-rc.2
• 0.15.0-rc.3
• 0.15.0-rc.4

License

• open-source

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