CVE-2024-39316: Rack Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-cj83-2ww7-mvq7
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CVSS 6.5
CWE-1333
Published
Advisory Summary

CVE-2024-39316 is a MODERATE (CVSS 6.5) denial of service vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting Rack libraries in the RubyGems ecosystem. The issue involves rack redos vulnerability in http accept headers parsing. Remediation is available by upgrading affected packages to version 3.1.5.

CVE-2024-39316 at a Glance

CVE Identifier CVE-2024-39316
GHSA Identifier GHSA-cj83-2ww7-mvq7
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product Rack
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

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

How to Fix CVE-2024-39316

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

rack fixed: 3.1.5 
Upgrade rack to 3.1.5
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 rack

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-39316, inspect your project dependencies for Rack:

inspect dependencies for rack

Analyze the terminal output to locate any version of Rack in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.5), 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-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In Rack, 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

### Summary A Regular Expression Denial of Service (ReDoS) vulnerability exists in the `Rack::Request::Helpers` module when parsing HTTP Accept headers. This vulnerability can be exploited by an attacker sending specially crafted `Accept-Encoding` or `Accept-Language` headers, causing the server to spend excessive time processing the request and leading to a Denial of Service (DoS). ### Details The fix for https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f was not applied to the main branch and thus while the issue was fixed for the Rack v3.0 release series, it was not fixed in the v3.1 release series until v3.1.5.

CVE-2024-39316 Affected Rack Versions

1 component(s)
Fixed Versions:
3.1.5
Product / Package Ecosystem Affected Versions Fixed Version
rack
gem/rack
RubyGems
≥ 3.1.0
< 3.1.5
3.1.5

References

GitHub Advisory / Wiki ADVISORY
https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f
GitHub Advisory / Wiki ADVISORY
https://github.com/rack/rack/security/advisories/GHSA-cj83-2ww7-mvq7
NVD — CVE-2024-39316 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-39316
Security Fix Commit FIX COMMIT
https://github.com/rack/rack/commit/412c980450ca729ee37f90a2661f166a9665e058
advisory.dw1.io/61 WEB
https://advisory.dw1.io/61
Rack Source Repository REPOSITORY
https://github.com/rack/rack
Rack Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-39316.yml

Frequently Asked Questions

What is CVE-2024-39316?
CVE-2024-39316 is a security vulnerability in Rack involving Rack ReDoS Vulnerability in HTTP Accept Headers Parsing under CWE-1333: Inefficient Regular Expression Complexity.
Which Rack versions are affected?
Affected versions include releases prior to 3.1.5 across affected packages: rack.
What version fixes CVE-2024-39316?
Upgrading to 3.1.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is rack affected?
Yes, rack is affected in releases prior to 3.1.5. Upgrade your dependency to 3.1.5 or later.
What is the CVSS score of CVE-2024-39316?
CVE-2024-39316 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2024-39316?
CVE-2024-39316 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check RubyGems dependencies for CVE-2024-39316?
Run the dependency tree command: 'inspect dependencies for rack'. 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-cj83-2ww7-mvq7",
  "modified" : "2024-11-05T18:12:49Z",
  "published" : "2024-07-03T17:03:45Z",
  "aliases" : [ "CVE-2024-39316" ],
  "summary" : "Rack ReDoS Vulnerability in HTTP Accept Headers Parsing",
  "details" : "### Summary\n\nA Regular Expression Denial of Service (ReDoS) vulnerability exists in the `Rack::Request::Helpers` module when parsing HTTP Accept headers. This vulnerability can be exploited by an attacker sending specially crafted `Accept-Encoding` or `Accept-Language` headers, causing the server to spend excessive time processing the request and leading to a Denial of Service (DoS).\n\n### Details\n\nThe fix for https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f was not applied to the main branch and thus while the issue was fixed for the Rack v3.0 release series, it was not fixed in the v3.1 release series until v3.1.5.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.1.0"
      }, {
        "fixed" : "3.1.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/rack/rack/security/advisories/GHSA-54rr-7fvw-6x8f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rack/rack/security/advisories/GHSA-cj83-2ww7-mvq7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-39316"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rack/rack/commit/412c980450ca729ee37f90a2661f166a9665e058"
  }, {
    "type" : "WEB",
    "url" : "https://advisory.dw1.io/61"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rack/rack"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-39316.yml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-07-03T17:03:45Z",
    "nvd_published_at" : "2024-07-02T16:15:04Z"
  }
}