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GHSA-5rc7-2jj6-mp64
No affected components available
Impact
The Terraform Provider for Linode versions prior to v3.9.0 logged sensitive information including some passwords, StackScript content, object storage data, and NodeBalancer TLS keys in debug logs without redaction.
Important: Provider debug logging is not enabled by default.
This issue is exposed when debug/provider logs are explicitly enabled (for example in local troubleshooting, CI/CD jobs, or centralized log collection). If enabled, sensitive values may be written to logs and then retained, shared, or exported beyond the original execution environment.
Specifically:
- Instance creation operations logged the full InstanceCreateOptions struct containing RootPass and StackScriptData
- Instance disk creation logged InstanceDiskCreateOptions containing RootPass and StackscriptData
- StackScript update operations logged the complete script content via StackscriptUpdateOptions.Script
- Image share group member creation logged tokens in ImageShareGroupAddMemberOptions.Token
- Object storage operations logged full PutObjectInput structures containing user data
- NodeBalancer config create and update operations logged NodeBalancerConfigCreateOptions and NodeBalancerConfigUpdateOptions containing the SSLKey (TLS private key)
An authenticated user with access to provider debug logs (through log aggregation systems, CI/CD pipelines, or debug output) would thus be able to extract these sensitive credentials.
Patches
Update to version v3.9.0 or later, which sanitizes debug logs by logging only non-sensitive metadata such as labels, regions, and resource IDs while redacting credentials, tokens, keys, scripts, and other sensitive content.
Workarounds and Mitigations
- Disable Terraform/provider debug logging or set it to
WARNlevel or above- To disable the logging, you can unset
TF_LOG_PROVIDERandTF_LOGenvironment variables - Or you can set them to
WARNorERRORlevels to avoid sensitive information logged inINFOandDEBUGlevels. - See Terraform docs for details: https://developer.hashicorp.com/terraform/internals/debugging
- To disable the logging, you can unset
- Restrict access to existing and historical logs
- Purge/retention-trim logs that may contain sensitive values
- Rotate potentially exposed secrets/credentials, including:
- Root passwords
- Image share group tokens
- TLS private keys/certificates used in NodeBalancer configs
- StackScript content/secrets if embedded
Credits
This issue was reported to Terraform by Hasan Sheet via Akamai's HackerOne Bug Bounty program.
Resources
https://github.com/linode/terraform-provider-linode/releases/tag/v3.9.0 https://github.com/linode/terraform-provider-linode/pull/2269 https://github.com/linode/terraform-provider-linode/commit/43a925d826b999f0355de3dc7330c55f496824c0
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
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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