attest: fix uint32 underflow in parseEfiSignatureList

F-GO-ATTESTATION-001

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

—score not recorded

google/go-attestationReported fixgoogle/go-attestation

attest: fix uint32 underflow in parseEfiSignatureList

fixed publicly

details

Finding IDs: F-GO-ATTESTATION-001
Status: fixed publicly
Reported via: security contact
Note: public issue #485, PR #486, merged on 2026-03-06. upstream added the lower-bound validation for malformed EFI_SIGNATURE_LIST parsing in parseEfiSignatureList.

F-GO-ATTESTATION-001: Input / state handling. Malformed EFI list lengths underflow before the required lower-bound check. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-GO-ATTESTATION-001

Security area (1seal assessment): Availability. Malformed EFI signature-list lengths can cause an infinite loop or an approximately 4 GiB allocation and OOM panic. The checked Go parser therefore concerns availability, not established memory corruption. Reviewed 24 Sep 2026.

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