{
  "GSD": {
    "alias": "CVE-2021-21424",
    "description": "Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.",
    "id": "GSD-2021-21424",
    "references": [
      "https://ubuntu.com/security/CVE-2021-21424"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-21424"
      ],
      "details": "Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4.",
      "id": "GSD-2021-21424",
      "modified": "2023-12-13T01:23:10.834877Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ID": "CVE-2021-21424",
        "STATE": "PUBLIC",
        "TITLE": "Prevent user enumeration using Guard or the new Authenticator-based Security"
      },
      "affects": {
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      "description": {
        "description_data": [
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            "value": "Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that 403s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch 3.4."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
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          {
            "name": "FEDORA-2021-f3ad34aa9f",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4/"
          },
          {
            "name": "FEDORA-2021-121edb82dd",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3/"
          },
          {
            "name": "FEDORA-2021-c57937ab9f",
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW/"
          },
          {
            "name": "FEDORA-2021-2d145b95f6",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M/"
          },
          {
            "name": "[debian-lts-announce] 20230711 [SECURITY] [DLA 3493-1] symfony security update",
            "refsource": "MLIST",
            "url": "https://lists.debian.org/debian-lts-announce/2023/07/msg00014.html"
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          "package_slug": "packagist/symfony/form",
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          "solution": "Upgrade to versions 4.4.24, 5.2.8 or above.",
          "title": "Information Exposure",
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          "description": "Symfony is a PHP framework for web and console applications and a set of reusable PHP components. The ability to enumerate users was possible without relevant permissions due to different handling depending on whether the user existed or not when attempting to use the switch users functionality. We now ensure that s are returned whether the user exists or not if a user cannot switch to a user or if the user does not exist. The patch for this issue is available for branch ",
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          "solution": "Upgrade to versions 3.4.48, 4.4.23, 5.2.8 or above.",
          "title": "Exposure of Sensitive Information to an Unauthorized Actor",
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          "pubdate": "2021-05-13",
          "solution": "Upgrade to versions 3.4.48, 4.4.23, 5.2.8 or above.",
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          "title": "Information Exposure",
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          "package_slug": "packagist/symfony/symfony",
          "pubdate": "2021-05-13",
          "solution": "Upgrade to versions 3.4.48, 4.4.23, 5.2.8 or above.",
          "title": "Information Exposure",
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4/"
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            },
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              "name": "[debian-lts-announce] 20230711 [SECURITY] [DLA 3493-1] symfony security update",
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          "acInsufInfo": false,
          "cvssV2": {
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            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2023-07-12T01:15Z",
      "publishedDate": "2021-05-13T16:15Z"
    }
  }
}