CVE-2025-62375
MediumCVSS 6.9Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
go-witness and witness modules in versions go-witness 0.8.6 and earlier and witness 0.9.2 and earlier improperly verify AWS EC2 instance identity documents. Verification can incorrectly succeed when a signature is missing or empty, and when RSA signature verification fails. An attacker able to supply or intercept instance identity document data can cause a forged document to be accepted, leading to incorrect trust decisions.
Risk Assessment
Forged instance identity documents may be accepted, leading to incorrect trust decisions and potential security breaches in attestation-based systems.
Recommendation
Update go-witness to version 0.9.1 or witness to 0.10.1. If updating is not possible, manually verify identity documents, signatures, and public keys using standard tools, or disable the AWS attestor.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS