gsd-2021-21708
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.
Aliases
Aliases
CVE-2021-21708


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-21708",
    "description": "In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.",
    "id": "GSD-2021-21708",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-21708.html",
      "https://www.debian.org/security/2022/dsa-5082",
      "https://ubuntu.com/security/CVE-2021-21708",
      "https://security.archlinux.org/CVE-2021-21708",
      "https://access.redhat.com/errata/RHSA-2022:7624",
      "https://access.redhat.com/errata/RHSA-2022:7628",
      "https://access.redhat.com/errata/RHSA-2022:8197"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-21708"
      ],
      "details": "In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.",
      "id": "GSD-2021-21708",
      "modified": "2023-12-13T01:23:10.741762Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@php.net",
        "DATE_PUBLIC": "2022-02-14T08:00:00.000Z",
        "ID": "CVE-2021-21708",
        "STATE": "PUBLIC",
        "TITLE": "UAF due to php_filter_float() failing"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "PHP",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "7.4.x",
                          "version_value": "7.4.28"
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                          "version_value": "8.0.16"
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                          "version_name": "8.1.X",
                          "version_value": "8.1.3"
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                ]
              },
              "vendor_name": "PHP Group"
            }
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      },
      "credit": [
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          "lang": "eng",
          "value": "dukk at softdev dot online"
        }
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      "description": {
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            "value": "In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits."
          }
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      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L",
          "version": "3.1"
        }
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      "problemtype": {
        "problemtype_data": [
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                "value": "CWE-416 Use After Free"
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      },
      "references": {
        "reference_data": [
          {
            "name": "https://bugs.php.net/bug.php?id=81708",
            "refsource": "MISC",
            "url": "https://bugs.php.net/bug.php?id=81708"
          },
          {
            "name": "https://security.netapp.com/advisory/ntap-20220325-0004/",
            "refsource": "CONFIRM",
            "url": "https://security.netapp.com/advisory/ntap-20220325-0004/"
          },
          {
            "name": "GLSA-202209-20",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/202209-20"
          }
        ]
      },
      "source": {
        "defect": [
          "https://bugs.php.net/bug.php?id=81708"
        ],
        "discovery": "EXTERNAL"
      }
    },
    "nvd.nist.gov": {
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        "nodes": [
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                "cpe23Uri": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
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                "versionEndExcluding": "8.1.3",
                "versionStartIncluding": "8.1.0",
                "vulnerable": true
              },
              {
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              },
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          "ID": "CVE-2021-21708"
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        "description": {
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            }
          ]
        },
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        "references": {
          "reference_data": [
            {
              "name": "N/A",
              "refsource": "CONFIRM",
              "tags": [
                "Exploit",
                "Issue Tracking",
                "Patch",
                "Vendor Advisory"
              ],
              "url": "https://bugs.php.net/bug.php?id=81708"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20220325-0004/",
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              "tags": [
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              "url": "https://security.netapp.com/advisory/ntap-20220325-0004/"
            },
            {
              "name": "GLSA-202209-20",
              "refsource": "GENTOO",
              "tags": [
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              "url": "https://security.gentoo.org/glsa/202209-20"
            }
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        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.8,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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            "version": "3.1"
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          "exploitabilityScore": 3.9,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2022-10-07T14:31Z",
      "publishedDate": "2022-02-27T08:15Z"
    }
  }
}


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