CVE-2024-45395 Unbounded loop over untrusted input can lead to endless data attack
Attackers can cause denial of service in applications using sigstore-go by submitting maliciously crafted bundles with excessive verifiable data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2024-45395?
CVE-2024-45395 is a low-severity denial of service vulnerability in sigstore-go, published on 4 Sep 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-835
Which versions are affected by CVE-2024-45395?
3 open source packages ship an affected version, including github.com/sigstore/sigstore-go. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/sigstore/sigstore-go Go | All versions | 0.6.1 |
github.com/sigstore/sigstore-go Go | All versions | 0.6.1 |
github.com/sigstore/sigstore-go Go | All versions | 0.6.1 |
Products include Sigstore Sigstore-Go.
How do I fix CVE-2024-45395?
Upgrade github.com/sigstore/sigstore-go to 0.6.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-45395 being exploited?
There is no known exploitation of CVE-2024-45395 in the wild and no public exploit code.
Other vulnerabilities in sigstore-go
Sources
Also known as GHSA-cq38-jh5f-37mq, GO-2024-3116.