Vulnerability · Published Sep 4, 2024 · Assigned by GitHub_M
CVE-2024-45395Unbounded loop over untrusted input can lead to endless data attack
Low 3.1
In plain English
A low-severity infinite loop in sigstore-go from sigstore. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
sigstore-go, a Go library for Sigstore signing and verification, is susceptible to a denial of service attack in versions prior to 0.6.1 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. 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, and 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. 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/sigstore/sigstore-go | 0.6.1 | GHSA-cq38-jh5f-37mq |
| Go | github.com/sigstore/sigstore-go | 0.6.1 | GO-2024-3116 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| sigstore | sigstore-go | < 0.6.1 |
Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
References
- https://github.com/sigstore/sigstore-go/security/advisories/GHSA-cq38-jh5f-37mq x_refsource_CONFIRM
- https://github.com/sigstore/sigstore-go/commit/01e70e89e58226286d7977b4dba43b6be472b12c x_refsource_MISC
- https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/signature.go#L183-L193 x_refsource_MISC
- https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tlog.go#L74-L178 x_refsource_MISC
- https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tsa.go#L59-L68 x_refsource_MISC