CVE-2024-21491: Svix Authentication Bypass Vulnerability

MODERATE
Advisory Identifier: GHSA-747x-5m58-mq97
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CVSS 6.8
CWE-288 CWE-347
Published
Advisory Summary

CVE-2024-21491 is a MODERATE (CVSS 6.8) authentication bypass vulnerability (CWE-288: Authentication Bypass Using an Alternate Path or Channel) affecting Svix libraries in the crates.io ecosystem. The issue involves svix vulnerable to authentication bypass. Remediation is available by upgrading affected packages to version 1.17.0.

CVE-2024-21491 at a Glance

CVE Identifier CVE-2024-21491
GHSA Identifier GHSA-747x-5m58-mq97
Severity MODERATE
CVSS v3.1 Base Score 6.8
CWE Classification CWE-288: Authentication Bypass Using an Alternate Path or Channel
Affected Product Svix
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 6.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2024-21491

To remediate this vulnerability, upgrade all affected Svix dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

svix fixed: 1.17.0 
Upgrade svix to 1.17.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for svix

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-21491, inspect your project dependencies for Svix:

inspect dependencies for svix

Analyze the terminal output to locate any version of Svix in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.17.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-288: Authentication Bypass Using an Alternate Path or Channel, where the product requires authentication, but the product has an alternate path or channel that does not require authentication. In Svix, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2024-21491 Affected Svix Versions

1 component(s)
Fixed Versions:
1.17.0
Product / Package Ecosystem Affected Versions Fixed Version
svix
 crates.io
< 1.17.0
1.17.0

References

NVD — CVE-2024-21491 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-21491
Svix Source Repository REPOSITORY
https://github.com/svix/svix-webhooks/pull/1190
Security Fix Commit FIX COMMIT
https://github.com/svix/svix-webhooks/commit/958821bd3b956d1436af65f70a0964d4ffb7daf6
Svix Source Repository REPOSITORY
https://github.com/svix/svix-webhooks
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2024-0010.html
Svix Security Information SECURITY
https://security.snyk.io/vuln/SNYK-RUST-SVIX-6230729

Frequently Asked Questions

What is CVE-2024-21491?
CVE-2024-21491 is a security vulnerability in Svix involving svix vulnerable to Authentication Bypass under CWE-288: Authentication Bypass Using an Alternate Path or Channel.
Which Svix versions are affected?
Affected versions include releases prior to 1.17.0 across affected packages: svix.
What version fixes CVE-2024-21491?
Upgrading to 1.17.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is svix affected?
Yes, svix is affected in releases prior to 1.17.0. Upgrade your dependency to 1.17.0 or later.
What is the CVSS score of CVE-2024-21491?
CVE-2024-21491 has a CVSS v3.1 base score of 6.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2024-21491?
CVE-2024-21491 is classified under CWE-288: Authentication Bypass Using an Alternate Path or Channel (The product requires authentication, but the product has an alternate path or channel that does not require authentication.).
How can I check crates.io dependencies for CVE-2024-21491?
Run the dependency tree command: 'inspect dependencies for svix'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-747x-5m58-mq97",
  "modified" : "2024-10-16T17:06:15Z",
  "published" : "2024-02-13T06:30:28Z",
  "aliases" : [ "CVE-2024-21491" ],
  "summary" : "svix vulnerable to Authentication Bypass",
  "details" : "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.\n\n**Note:**\n\nThe 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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "svix"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.17.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-21491"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/svix/svix-webhooks/pull/1190"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/svix/svix-webhooks/commit/958821bd3b956d1436af65f70a0964d4ffb7daf6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/svix/svix-webhooks"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2024-0010.html"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-RUST-SVIX-6230729"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-288", "CWE-347" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-02-13T18:36:52Z",
    "nvd_published_at" : "2024-02-13T05:15:08Z"
  }
}