fix(deps): update module github.com/sigstore/sigstore-go to v0.6.1 [security] - autoclosed

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/sigstore/sigstore-go	v0.6.0 -> v0.6.1

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Warning

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GitHub Vulnerability Alerts

CVE-2024-45395

Impact

sigstore-go is susceptible to a denial of service attack when a verifier is provided a maliciously crafted Sigstore Bundle containing large amounts of verifiable data, in the form of signed transparency log entries, RFC 3161 timestamps, and attestation subjects. The verification of these data structures is computationally expensive. This can be used to consume excessive CPU resources, leading to a denial of service attack. TUF's security model labels this type of vulnerability an "Endless data attack," and can lead to verification failing to complete and disrupting services that rely on sigstore-go for verification.

The vulnerable loops are in the verification functions in the package github.com/sigstore/sigstore-go/pkg/verify. The first is the DSSE envelope verification loop in verifyEnvelopeWithArtifact, which decodes all the digests in an attestation can be found here:

https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/signature.go#L183-L193

The next loop is in the VerifyArtifactTransparencyLog function, which verifies all the signed entries in a bundle:

https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tlog.go#L74-L178

The next loop is the VerifyTimestampAuthority function, which verifies all the RFC 3161 timestamps in a bundle:

https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tsa.go#L59-L68

Patches

This vulnerability is addressed with sigstore-go 0.6.1, which adds hard limits to the number of verifiable data structures that can be processed in a bundle. Verification will fail if a bundle has data that exceeds these limits. The limits are:

• 32 signed transparency log entries
• 32 RFC 3161 timestamps
• 1024 attestation subjects
• 32 digests per attestation subject

These limits are intended to be high enough to accommodate the vast majority of use cases, while preventing the verification of maliciously crafted bundles that contain large amounts of verifiable data.

Workarounds

The best way to mitigate the risk is to upgrade to sigstore-go 0.6.1 or later. Users who are vulnerable but unable to quickly upgrade may consider adding manual bundle validation to enforce limits similar to those in the referenced patch prior to calling sigstore-go's verification functions.

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Release Notes

sigstore/sigstore-go (github.com/sigstore/sigstore-go)

v0.6.1

Compare Source

What's Changed

v0.6.1 resolves a security advisory for a denial of service. See GHSA-cq38-jh5f-37mq for more information.

• Add fuzz tests for bundle, tlog and verify packages by @​AdamKorcz in https://github.com/sigstore/sigstore-go/pull/272
• Add the ability to contruct TrustRoot from targets by @​bkabrda in https://github.com/sigstore/sigstore-go/pull/247
• add oss-fuzz build script by @​AdamKorcz in https://github.com/sigstore/sigstore-go/pull/278
• Fix proof of key possession generation by @​adityasaky in https://github.com/sigstore/sigstore-go/pull/283
• Add additional validation for nil elements in Bundles by @​codysoyland in https://github.com/sigstore/sigstore-go/pull/285
• Add hard limits for number of TSA entries, Tlog entries, and attestation subjects/digests by @​codysoyland in https://github.com/sigstore/sigstore-go/pull/286

Full Changelog: sigstore/sigstore-go@v0.6.0...v0.6.1

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[forking-renovate]

ℹ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 3 additional dependencies were updated

Details:

Package	Change
github.com/sigstore/sigstore	v1.8.8 -> v1.8.9
github.com/docker/cli	v24.0.7+incompatible -> v27.1.1+incompatible
github.com/google/go-containerregistry	v0.20.1 -> v0.20.2