User data in TPM attestation vulnerable to MITM
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- Information disclosure
- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-200.
Summary
### Impact Attestation *user data* (such as the digest of the public key in an aTLS connection) was bound to the issuer's TPM, but not to its PCR state. An attacker could intercept a node initialization, initialize the node themselves, and then impersonate an uninitialized node to the validator. In practice, this meant that a CSP insider with sufficient privileges would have been able to join a node under their control to a Constellation cluster. ### Patches The issue has been patched in [v2.5.2](https://github.com/edgelesssys/constellation/releases/tag/v2.5.2). ### Workarounds none
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | github.com/edgelesssys/constellation/v2 (Go) | before 2.5.2 | 2.5.2 | Patch available | GHSA-r2h5-3hgw-8j34 |
- github.com/edgelesssys/constellation/v2 (Go) Vendor— Affected before 2.5.2 Fixed in 2.5.2 Patch available GHSA-r2h5-3hgw-8j34
Remediation
- Fix · GHSA-r2h5-3hgw-8j34 github.com/edgelesssys/constellation/v2 (Go) Fixed in 2.5.2 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-r2h5-3hgw-8j34
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences