CVE-2022-44572: Rack Denial of Service Vulnerability

LOW
Advisory Identifier: GHSA-rqv2-275x-2jq5
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CWE-400 CWE-1333
Published
Advisory Summary

CVE-2022-44572 is a LOW denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Rack libraries in the RubyGems ecosystem. The issue involves denial of service via multipart parsing in rack. Remediation is available by upgrading affected packages to version 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1.

CVE-2022-44572 at a Glance

CVE Identifier CVE-2022-44572
GHSA Identifier GHSA-rqv2-275x-2jq5
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Rack
Package Ecosystem RubyGems
Published Date
Last Updated

How to Fix CVE-2022-44572

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: 2.0.9.2 
Upgrade rack to 2.0.9.2
rack fixed: 2.1.4.2 
Upgrade rack to 2.1.4.2
rack fixed: 2.2.6.1 
Upgrade rack to 2.2.6.1
rack fixed: 3.0.4.1 
Upgrade rack to 3.0.4.1
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-2022-44572, 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 2.0.9.2), 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. 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

There is a denial of service vulnerability in the multipart parsing component of Rack. This vulnerability has been assigned the CVE identifier CVE-2022-44572. Versions Affected: >= 2.0.0 Not affected: None. Fixed Versions: 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.0.1 Impact Carefully crafted input can cause RFC2183 multipart boundary parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. Any applications that parse multipart posts using Rack (virtually all Rails applications) are impacted. Releases The fixed releases are available at the normal locations. Workarounds There are no feasible workarounds for this issue. Patches To aid users who aren’t able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset. 2-0-Forbid-control-characters-in-attributes.patch - Patch for 2.0 series 2-1-Forbid-control-characters-in-attributes.patch - Patch for 2.1 series 2-2-Forbid-control-characters-in-attributes.patch - Patch for 2.2 series 3-0-Forbid-control-characters-in-attributes.patch - Patch for 3.0 series

CVE-2022-44572 Affected Rack Versions

4 component(s)
Fixed Versions:
2.0.9.22.1.4.22.2.6.13.0.4.1
Product / Package Ecosystem Affected Versions Fixed Version
rack
gem/rack
RubyGems
≥ 2.0.0
< 2.0.9.2
2.0.9.2
rack
gem/rack
RubyGems
≥ 2.1.0.0
< 2.1.4.2
2.1.4.2
rack
gem/rack
RubyGems
≥ 2.2.0.0
< 2.2.6.1
2.2.6.1
rack
gem/rack
RubyGems
≥ 3.0.0.0
< 3.0.4.1
3.0.4.1

References

NVD — CVE-2022-44572 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-44572
hackerone.com/reports/1639882 WEB
https://hackerone.com/reports/1639882
Rack Source Repository REPOSITORY
https://github.com/rack/rack
Rack Release RELEASE
https://github.com/rack/rack/releases/tag/v3.0.4.1
Rack Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2022-44572.yml
Rack Security Information SECURITY
https://www.debian.org/security/2023/dsa-5530

Frequently Asked Questions

What is CVE-2022-44572?
CVE-2022-44572 is a security vulnerability in Rack involving Denial of service via multipart parsing in Rack under CWE-400: Uncontrolled Resource Consumption.
Which Rack versions are affected?
Affected versions include releases prior to 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1 across affected packages: rack.
What version fixes CVE-2022-44572?
Upgrading to 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is rack affected?
Yes, rack is affected in releases prior to 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1. Upgrade your dependency to 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1 or later.
What CWE is associated with CVE-2022-44572?
CVE-2022-44572 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check RubyGems dependencies for CVE-2022-44572?
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-rqv2-275x-2jq5",
  "modified" : "2023-10-23T19:17:24Z",
  "published" : "2023-01-18T18:19:21Z",
  "aliases" : [ "CVE-2022-44572" ],
  "summary" : "Denial of service via multipart parsing in Rack",
  "details" : "There is a denial of service vulnerability in the multipart parsing component of Rack. This vulnerability has been assigned the CVE identifier CVE-2022-44572.\n\nVersions Affected: >= 2.0.0 Not affected: None. Fixed Versions: 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.0.1\nImpact\n\nCarefully crafted input can cause RFC2183 multipart boundary parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. Any applications that parse multipart posts using Rack (virtually all Rails applications) are impacted.\nReleases\n\nThe fixed releases are available at the normal locations.\nWorkarounds\n\nThere are no feasible workarounds for this issue.\nPatches\n\nTo aid users who aren’t able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.\n\n    2-0-Forbid-control-characters-in-attributes.patch - Patch for 2.0 series\n    2-1-Forbid-control-characters-in-attributes.patch - Patch for 2.1 series\n    2-2-Forbid-control-characters-in-attributes.patch - Patch for 2.2 series\n    3-0-Forbid-control-characters-in-attributes.patch - Patch for 3.0 series\n",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.0.9.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.1.0.0"
      }, {
        "fixed" : "2.1.4.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.2.0.0"
      }, {
        "fixed" : "2.2.6.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0.0"
      }, {
        "fixed" : "3.0.4.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-44572"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/1639882"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rack/rack"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rack/rack/releases/tag/v3.0.4.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2022-44572.yml"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2023/dsa-5530"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333", "CWE-400" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-01-18T18:19:21Z",
    "nvd_published_at" : "2023-02-09T20:15:00Z"
  }
}