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CVE-2024-21491

5.9 · MEDIUM

Versions of the package svix before 1.17.0 are vulnerable to Authentication Bypass due to an issue in the verify function where signatures of different lengths are incorrectly compared.

Published Feb 13, 2024CWE-288EPSS 0.41%

Overview

CVE-2024-21491 is a medium-severity vulnerability. It was published on February 13, 2024 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Versions of the package svix before 1.17.0 are vulnerable to Authentication Bypass due to an issue in the verify function where signatures of different lengths are incorrectly compared. An attacker can bypass signature verification by providing a shorter signature that matches the beginning of the actual signature. **Note:** The attacker would need to know a victim uses the Rust library for verification,no easy way to automatically check that; and uses webhooks by a service that uses Svix, and then figure out a way to craft a malicious payload that will actually include all of the correct identifiers needed to trick the receivers to cause actual issues.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/svix/svix-webhooks/commit/958821bd3b956d1436af65f70a0964d4ffb7daf6GitHubgithub.com/svix/svix-webhooks/pull/1190Refrustsec.org/advisories/RUSTSEC-2024-0010.htmlRefsecurity.snyk.io/vuln/SNYK-RUST-SVIX-6230729GitHubgithub.com/svix/svix-webhooks/commit/958821bd3b956d1436af65f70a0964d4ffb7daf6GitHubgithub.com/svix/svix-webhooks/pull/1190Refrustsec.org/advisories/RUSTSEC-2024-0010.htmlRefsecurity.snyk.io/vuln/SNYK-RUST-SVIX-6230729

How CyberStrike helps

Frequently asked questions

What is CVE-2024-21491?

CVE-2024-21491 is a medium-severity vulnerability. It was published on February 13, 2024 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2024-21491?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-21491?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-21491?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-21491 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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