CVE-2022-30122: Rack Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-hxqx-xwvh-44m2
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CVSS 7.5
CWE-400 CWE-1333
Published
Advisory Summary

CVE-2022-30122 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Rack libraries in the RubyGems ecosystem. The issue involves denial of service vulnerability in rack multipart parsing. Remediation is available by upgrading affected packages to version 2.0.9.1, 2.1.4.1, 2.2.3.1.

CVE-2022-30122 at a Glance

CVE Identifier CVE-2022-30122
GHSA Identifier GHSA-hxqx-xwvh-44m2
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Rack
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2022-30122

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: 2.0.9.1 
Upgrade rack to 2.0.9.1
rack fixed: 2.1.4.1 
Upgrade rack to 2.1.4.1
rack fixed: 2.2.3.1 
Upgrade rack to 2.2.3.1
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-2022-30122, 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 2.0.9.1), 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 possible denial of service vulnerability in the multipart parsing component of Rack. This vulnerability has been assigned the CVE identifier CVE-2022-30122. Versions Affected: >= 1.2 Not affected: < 1.2 Fixed Versions: 2.0.9.1, 2.1.4.1, 2.2.3.1 ## Impact Carefully crafted multipart POST requests can cause Rack's multipart parser to take much longer than expected, leading to a possible denial of service vulnerability. Impacted code will use Rack's multipart parser to parse multipart posts. This includes directly using the multipart parser like this: ``` params = Rack::Multipart.parse_multipart(env) ``` But it also includes reading POST data from a Rack request object like this: ``` p request.POST # read POST data p request.params # reads both query params and POST data ``` All users running an affected release should either upgrade or use one of the workarounds immediately. ## Workarounds There are no feasible workarounds for this issue.

CVE-2022-30122 Affected Rack Versions

3 component(s)
Fixed Versions:
2.0.9.12.1.4.12.2.3.1
Product / Package Ecosystem Affected Versions Fixed Version
rack
gem/rack
RubyGems
≥ 1.2
< 2.0.9.1
2.0.9.1
rack
gem/rack
RubyGems
≥ 2.1
< 2.1.4.1
2.1.4.1
rack
gem/rack
RubyGems
≥ 2.2
< 2.2.3.1
2.2.3.1

References

NVD — CVE-2022-30122 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-30122
discuss.rubyonrails.org/t/cve-2022-30122-de... WEB
https://discuss.rubyonrails.org/t/cve-2022-30122-denial-of-service-vulnerability-in-rack-multipart-parsing/80729
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-2022-30122.yml
Rack Security Information SECURITY
https://groups.google.com/g/ruby-security-ann/c/L2Axto442qk
Rack Security Information SECURITY
https://security.gentoo.org/glsa/202310-18
Rack Security Information SECURITY
https://security.netapp.com/advisory/ntap-20231208-0012
Rack Security Information SECURITY
https://www.debian.org/security/2023/dsa-5530

Frequently Asked Questions

What is CVE-2022-30122?
CVE-2022-30122 is a security vulnerability in Rack involving Denial of Service Vulnerability in Rack Multipart Parsing under CWE-400: Uncontrolled Resource Consumption.
Which Rack versions are affected?
Affected versions include releases prior to 2.0.9.1, 2.1.4.1, 2.2.3.1 across affected packages: rack.
What version fixes CVE-2022-30122?
Upgrading to 2.0.9.1, 2.1.4.1, 2.2.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is rack affected?
Yes, rack is affected in releases prior to 2.0.9.1, 2.1.4.1, 2.2.3.1. Upgrade your dependency to 2.0.9.1, 2.1.4.1, 2.2.3.1 or later.
What is the CVSS score of CVE-2022-30122?
CVE-2022-30122 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-30122?
CVE-2022-30122 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-2022-30122?
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-hxqx-xwvh-44m2",
  "modified" : "2023-08-28T13:59:06Z",
  "published" : "2022-05-27T16:36:52Z",
  "aliases" : [ "CVE-2022-30122" ],
  "summary" : "Denial of Service Vulnerability in Rack Multipart Parsing",
  "details" : "There is a possible denial of service vulnerability in the multipart parsing component of Rack.  This vulnerability has been assigned the CVE identifier CVE-2022-30122.\n\nVersions Affected:  >= 1.2\nNot affected:       < 1.2\nFixed Versions:     2.0.9.1, 2.1.4.1, 2.2.3.1\n\n## Impact\nCarefully crafted multipart POST requests can cause Rack's multipart parser to take much longer than expected, leading to a possible denial of service vulnerability.\n\nImpacted code will use Rack's multipart parser to parse multipart posts.  This includes directly using the multipart parser like this:\n\n```\nparams = Rack::Multipart.parse_multipart(env)\n```\n\nBut it also includes reading POST data from a Rack request object like this:\n\n```\np request.POST # read POST data\np request.params # reads both query params and POST data\n```\n\nAll users running an affected release should either upgrade or use one of the workarounds immediately.\n\n## Workarounds\nThere are no feasible workarounds for this issue.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.2"
      }, {
        "fixed" : "2.0.9.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.0.9.0"
    }
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.1"
      }, {
        "fixed" : "2.1.4.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.1.4.0"
    }
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.2"
      }, {
        "fixed" : "2.2.3.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.2.3.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-30122"
  }, {
    "type" : "WEB",
    "url" : "https://discuss.rubyonrails.org/t/cve-2022-30122-denial-of-service-vulnerability-in-rack-multipart-parsing/80729"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rack/rack"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2022-30122.yml"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/g/ruby-security-ann/c/L2Axto442qk"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/202310-18"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20231208-0012"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2023/dsa-5530"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333", "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-05-27T16:36:52Z",
    "nvd_published_at" : "2022-12-05T22:15:00Z"
  }
}