Improper Certificate Validation Affecting tekton-chains package, versions <0.25.1-r7


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.02% (5th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-TEKTONCHAINS-13615026
  • published17 Oct 2025
  • disclosed15 Oct 2025

Introduced: 15 Oct 2025

NewCVE-2025-62375  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade Chainguard tekton-chains to version 0.25.1-r7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tekton-chains package and not the tekton-chains package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

go-witness and witness are Go modules for generating attestations. In go-witness versions 0.8.6 and earlier and witness versions 0.9.2 and earlier the AWS attestor improperly verifies AWS EC2 instance identity documents. Verification can incorrectly succeed when a signature is not present or is empty, and when RSA signature verification fails. The attestor also embeds a single legacy global AWS public certificate and does not account for newer region specific certificates issued in 2024, making detection of forged documents difficult without additional trusted region data. An attacker able to supply or intercept instance identity document data (such as through Instance Metadata Service impersonation) can cause a forged identity document to be accepted, leading to incorrect trust decisions based on the attestation. This is fixed in go-witness 0.9.1 and witness 0.10.1. As a workaround, manually verify the included identity document, signature, and public key with standard tools (for example openssl) following AWS’s verification guidance, or disable use of the AWS attestor until upgraded.

CVSS Base Scores

version 3.1