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FKIE_CVE-2018-1000005

Vulnerability from fkie_nvd - Published: 2018-01-24 22:29 - Updated: 2026-06-17 01:32
Severity
9.1 (Critical) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.
References
cve@mitre.orghttp://www.securitytracker.com/id/1040273Third Party Advisory, VDB Entry
cve@mitre.orghttps://access.redhat.com/errata/RHSA-2019:1543
cve@mitre.orghttps://curl.haxx.se/docs/adv_2018-824a.htmlPatch, Vendor Advisory
cve@mitre.orghttps://github.com/curl/curl/pull/2231Issue Tracking, Patch, Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/3554-1/Third Party Advisory
cve@mitre.orghttps://www.debian.org/security/2018/dsa-4098Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1040273Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2019:1543
af854a3a-2127-422b-91ae-364da2661108https://curl.haxx.se/docs/adv_2018-824a.htmlPatch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/curl/curl/pull/2231Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/3554-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2018/dsa-4098Third Party Advisory
Impacted products
Vendor Product Version
haxx libcurl *
debian debian_linux 8.0
debian debian_linux 9.0
canonical ubuntu_linux 14.04
canonical ubuntu_linux 16.04
canonical ubuntu_linux 17.10
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "11B88D2C-921D-4324-8BFD-66069D808808",
              "versionEndIncluding": "7.57.0",
              "versionStartIncluding": "7.49.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
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              "vulnerable": true
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              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252",
              "vulnerable": true
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          "operator": "OR"
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    },
    {
      "nodes": [
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              "vulnerable": true
            },
            {
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              "matchCriteriaId": "F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B",
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              "vulnerable": true
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          "negate": false,
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn\u0027t updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something."
    },
    {
      "lang": "es",
      "value": "libcurl 7.49.0 hasta e incluyendo la versi\u00f3n 7.57.0 contiene una lectura fuera de l\u00edmites en los trailers de manipulaci\u00f3n de c\u00f3digo HTTP/2. Se ha notificado (https://github.com/curl/curl/pull/2231) que la lectura de un trailer HTTP/2 podr\u00eda da\u00f1ar futuros trailers debido a que el tama\u00f1o almacenado era un byte menor de lo requerido. El problema es que el c\u00f3digo que crea cabeceras como HTTP/1 de los datos del trailer HTTP/2 anexaron una cadena como \":\" en el b\u00fafer objetivo, a pesar de que se hab\u00eda cambiado recientemente a \": \" (se a\u00f1adi\u00f3 un espacio despu\u00e9s de los dos puntos), pero la siguiente matem\u00e1tica no se actualiz\u00f3 debidamente. Al acceder a ellos, los datos se leen fuera de l\u00edmites y provocan o un cierre inesperado o que los datos (demasiado grandes) se pasen a escritura del cliente. Esto podr\u00eda conducir a una situaci\u00f3n de denegaci\u00f3n de servicio (DoS) o a una divulgaci\u00f3n de informaci\u00f3n si alguien tiene un servicio que devuelva ecos o que emplee los trailers para algo."
    }
  ],
  "id": "CVE-2018-1000005",
  "lastModified": "2026-06-17T01:32:11.433",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.4,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2018-01-24T22:29:00.307",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
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      "url": "http://www.securitytracker.com/id/1040273"
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    {
      "source": "cve@mitre.org",
      "url": "https://access.redhat.com/errata/RHSA-2019:1543"
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    {
      "source": "cve@mitre.org",
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      "url": "https://curl.haxx.se/docs/adv_2018-824a.html"
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    {
      "source": "cve@mitre.org",
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        "Third Party Advisory"
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      "url": "https://github.com/curl/curl/pull/2231"
    },
    {
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      "tags": [
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      "url": "https://www.debian.org/security/2018/dsa-4098"
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    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "url": "http://www.securitytracker.com/id/1040273"
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    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://access.redhat.com/errata/RHSA-2019:1543"
    },
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    },
    {
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      "url": "https://github.com/curl/curl/pull/2231"
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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