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CVE-2019-12525

Estado: ModificadaCrítica (9.8)—

An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (5)

Canonical — Ubuntu LinuxDebian — Debian LinuxFedoraproject — FedoraOpensuse — LeapSquid-cache — Squid

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2019-12525",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-07-11T19:15:13.000",
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    },
    {
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    {
      "url": "http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patch",
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      "url": "https://usn.ubuntu.com/4065-1/",
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      "url": "https://usn.ubuntu.com/4065-2/",
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    {
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      "url": "https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html",
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      "url": "https://usn.ubuntu.com/4065-1/",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Squid versiones 3.3.9 hasta 3.5.28 y versiones 4.x hasta 4.7. Cuando Squid está configurado para utilizar la autenticación implícita, analiza el encabezado Proxy-Authorization. Busca ciertos tokens como domain, uri y qop. Squid comprueba si el valor de este token comienza con una comilla y termina con uno. Si es así, realiza un memcpy de su longitud menos 2. Squid nunca comprueba si el valor es sólo una sola comilla (lo que satisfaría sus requisitos), lo que conlleva a un memcpy de su longitud menos 1."
    }
  ],
  "lastModified": "2026-06-17T02:14:49.437",
  "configurations": [
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      "nodes": [
        {
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              "vulnerable": true,
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              "versionEndIncluding": "3.5.28",
              "versionStartIncluding": "3.3.9"
            },
            {
              "criteria": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "61861774-A71F-48CB-B6B2-0489C57E4E66",
              "versionEndIncluding": "4.7",
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}