FKIE_CVE-2025-6442

Vulnerability from fkie_nvd - Published: 2025-06-25 17:15 - Updated: 2025-08-18 15:49
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.
References
zdi-disclosures@trendmicro.comhttps://github.com/ruby/webrick/commit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101#diff-ad02984d873efb089aa51551bc6b7d307a53e0ba1ac439e91d69c2e58a478864Patch
zdi-disclosures@trendmicro.comhttps://www.zerodayinitiative.com/advisories/ZDI-25-414/Third Party Advisory
Impacted products
Vendor Product Version
ruby-lang webrick *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:ruby-lang:webrick:*:*:*:*:*:ruby:*:*",
              "matchCriteriaId": "334FEC52-418A-49FC-A5C1-0FCAD123DD60",
              "versionEndExcluding": "1.8.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions.\n\nThe specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de contrabando de solicitudes HTTP en Ruby WEBrick read_header. Esta vulnerabilidad permite a atacantes remotos contrabandear solicitudes HTTP arbitrarias en las instalaciones afectadas de Ruby WEBrick. Este problema se puede explotar cuando el producto se implementa tras un proxy HTTP que cumple condiciones espec\u00edficas. La falla espec\u00edfica se encuentra en el m\u00e9todo read_headers. El problema se debe al an\u00e1lisis inconsistente de los terminadores de las cabeceras HTTP. Un atacante puede aprovechar esta vulnerabilidad para contrabandear solicitudes HTTP arbitrarias. Anteriormente, se denomin\u00f3 ZDI-CAN-21876."
    }
  ],
  "id": "CVE-2025-6442",
  "lastModified": "2025-08-18T15:49:38.773",
  "metrics": {
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
          "version": "3.0"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 4.2,
        "source": "zdi-disclosures@trendmicro.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-06-25T17:15:40.117",
  "references": [
    {
      "source": "zdi-disclosures@trendmicro.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/ruby/webrick/commit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101#diff-ad02984d873efb089aa51551bc6b7d307a53e0ba1ac439e91d69c2e58a478864"
    },
    {
      "source": "zdi-disclosures@trendmicro.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.zerodayinitiative.com/advisories/ZDI-25-414/"
    }
  ],
  "sourceIdentifier": "zdi-disclosures@trendmicro.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ],
      "source": "zdi-disclosures@trendmicro.com",
      "type": "Secondary"
    }
  ]
}


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