Vulnerability-Lookup

GSD-2023-22796

Vulnerability from gsd - Updated: 2023-01-18 00:00

Details

There is a possible regular expression based DoS vulnerability in Active Support. This vulnerability has been assigned the CVE identifier CVE-2023-22796. Versions Affected: All Not affected: None Fixed Versions: 5.2.8.15 (Rails LTS), 6.1.7.1, 7.0.4.1 # Impact A specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability. This affects String#underscore, ActiveSupport::Inflector.underscore, String#titleize, and any other methods using these. 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. Users on Ruby 3.2.0 or greater may be able to reduce the impact by configuring Regexp.timeout.

Aliases

CVE-2023-22796

JSON

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{
  "GSD": {
    "alias": "CVE-2023-22796",
    "id": "GSD-2023-22796",
    "references": [
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      "https://www.debian.org/security/2023/dsa-5372"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
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        "CVE-2023-22796",
        "GHSA-j6gc-792m-qgm2"
      ],
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      "id": "GSD-2023-22796",
      "modified": "2023-01-18T00:00:00.000Z",
      "published": "2023-01-18T00:00:00.000Z",
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      "description": "There is a possible regular expression based DoS vulnerability in Active\nSupport. This vulnerability has been assigned the CVE identifier\nCVE-2023-22796.\n\nVersions Affected: All\nNot affected: None\nFixed Versions: 5.2.8.15 (Rails LTS), 6.1.7.1, 7.0.4.1\n\n# Impact\n\nA specially crafted string passed to the underscore method can cause the\nregular expression engine to enter a state of catastrophic backtracking.\nThis can cause the process to use large amounts of CPU and memory, leading\nto a possible DoS vulnerability.\n\nThis affects String#underscore, ActiveSupport::Inflector.underscore,\nString#titleize, and any other methods using these.\n\nAll users running an affected release should either upgrade or use one of the\nworkarounds immediately.\n\n# Workarounds\n\nThere are no feasible workarounds for this issue.\n\nUsers on Ruby 3.2.0 or greater may be able to reduce the impact by\nconfiguring Regexp.timeout.",
      "gem": "activesupport",
      "ghsa": "j6gc-792m-qgm2",
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        "~\u003e 6.1.7, \u003e= 6.1.7.1",
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          "description": "A regular expression based DoS vulnerability in Active Support \u003c6.1.7.1 and \u003c7.0.4.1. A specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability.",
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          "title": "Inefficient Regular Expression Complexity",
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          "description": "There is a possible regular expression based DoS vulnerability in Active Support. A specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability. This affects `String#underscore`, `ActiveSupport::Inflector.underscore`, `String#titleize`, and any other methods using these. All users running an affected release should either upgrade or use one of the workarounds immediately.",
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          "package_slug": "gem/activesupport",
          "pubdate": "2023-01-18",
          "solution": "Upgrade to versions 6.1.7.1, 7.0.4.1 or above.",
          "title": "Duplicate of ./gem/activesupport/CVE-2023-22796.yml",
          "urls": [
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          "uuid": "408938ae-67cb-4c31-9bde-762cdec88336"
        }
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          }
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        "id": "CVE-2023-22796",
        "lastModified": "2024-02-02T14:15:53.433",
        "metrics": {
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                "baseScore": 7.5,
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}

CVE-2023-22796 (GCVE-0-2023-22796)

Vulnerability from cvelistv5 – Published: 2023-02-09 00:00 – Updated: 2024-11-27 15:16

Summary

A regular expression based DoS vulnerability in Active Support <6.1.7.1 and <7.0.4.1. A specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-02-05 21:51 UTC

CWE

CWE-400 - Denial of Service (CWE-400)

Assigner

hackerone mitre root

References

3 references

URL	Tags
https://discuss.rubyonrails.org/t/cve-2023-22796-…
https://www.debian.org/security/2023/dsa-5372	vendor-advisory
https://security.netapp.com/advisory/ntap-2024020…

Impacted products

1 product

Vendor	Product	Version
n/a	https://github.com/rails/rails	Affected: 6.1.7.1, 7.0.4.1

Show details on NVD website

JSON

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                "id": "CVE-2023-22796",
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GHSA-J6GC-792M-QGM2

Vulnerability from github – Published: 2023-01-18 18:23 – Updated: 2025-02-18 22:35

Summary

ReDoS based DoS vulnerability in Active Support's underscore

Details

There is a possible regular expression based DoS vulnerability in Active Support. This vulnerability has been assigned the CVE identifier CVE-2023-22796.

Versions Affected: All Not affected: None Fixed Versions: 5.2.8.15 (Rails LTS, which is a paid service and not part of the rubygem), 6.1.7.1, 7.0.4.1 Impact

A specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability.

This affects String#underscore, ActiveSupport::Inflector.underscore, String#titleize, and any other methods using these.

All users running an affected release should either upgrade or use one of the workarounds immediately. Releases

The FIXED releases are available at the normal locations. Workarounds

There are no feasible workarounds for this issue.

Users on Ruby 3.2.0 or greater may be able to reduce the impact by configuring Regexp.timeout. 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.

6-1-Avoid-regex-backtracking-in-Inflector.underscore.patch - Patch for 6.1 series
7-0-Avoid-regex-backtracking-in-Inflector.underscore.patch - Patch for 7.0 series

Please note that only the 7.0.Z and 6.1.Z series are supported at present, and 6.0.Z for severe vulnerabilities. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "activesupport"
      },
      "ranges": [
        {
          "events": [
            {
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      ]
    },
    {
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        "ecosystem": "RubyGems",
        "name": "activesupport"
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        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-22796"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-01-18T18:23:20Z",
    "nvd_published_at": "2023-02-09T20:15:00Z",
    "severity": "LOW"
  },
  "details": "There is a possible regular expression based DoS vulnerability in Active Support. This vulnerability has been assigned the CVE identifier CVE-2023-22796.\n\nVersions Affected: All Not affected: None Fixed Versions: 5.2.8.15 (Rails LTS, which is a paid service and not part of the rubygem), 6.1.7.1, 7.0.4.1\nImpact\n\nA specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability.\n\nThis affects String#underscore, ActiveSupport::Inflector.underscore, String#titleize, and any other methods using these.\n\nAll users running an affected release should either upgrade or use one of the workarounds immediately.\nReleases\n\nThe FIXED releases are available at the normal locations.\nWorkarounds\n\nThere are no feasible workarounds for this issue.\n\nUsers on Ruby 3.2.0 or greater may be able to reduce the impact by configuring Regexp.timeout.\nPatches\n\nTo aid users who aren\u2019t 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    6-1-Avoid-regex-backtracking-in-Inflector.underscore.patch - Patch for 6.1 series\n    7-0-Avoid-regex-backtracking-in-Inflector.underscore.patch - Patch for 7.0 series\n\nPlease note that only the 7.0.Z and 6.1.Z series are supported at present, and 6.0.Z for severe vulnerabilities. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.",
  "id": "GHSA-j6gc-792m-qgm2",
  "modified": "2025-02-18T22:35:59Z",
  "published": "2023-01-18T18:23:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-22796"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/commit/2164d4f6a1bde74b911fe9ba3c8df1b5bf345bf8"
    },
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    {
      "type": "WEB",
      "url": "https://discuss.rubyonrails.org/t/cve-2023-22796-possible-redos-based-dos-vulnerability-in-active-supports-underscore/82116"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rails/rails"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/releases/tag/v6.1.7.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/releases/tag/v7.0.4.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2023-22796.yml"
    },
    {
      "type": "WEB",
      "url": "https://rubyonrails.org/2023/1/17/Rails-Versions-6-0-6-1-6-1-7-1-7-0-4-1-have-been-released"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "ReDoS based DoS vulnerability in Active Support\u0027s underscore"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GSD-2023-22796

CVE-2023-22796 (GCVE-0-2023-22796)

GHSA-J6GC-792M-QGM2

Tags

Sightings

Nomenclature

Related by attack behaviour