gsd-2021-21703
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.
Aliases
Aliases
CVE-2021-21703


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-21703",
    "description": "In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.",
    "id": "GSD-2021-21703",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-21703.html",
      "https://www.debian.org/security/2021/dsa-4993",
      "https://www.debian.org/security/2021/dsa-4992",
      "https://ubuntu.com/security/CVE-2021-21703",
      "https://advisories.mageia.org/CVE-2021-21703.html",
      "https://security.archlinux.org/CVE-2021-21703",
      "https://linux.oracle.com/cve/CVE-2021-21703.html",
      "https://access.redhat.com/errata/RHSA-2022:1935",
      "https://access.redhat.com/errata/RHSA-2022:5491"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-21703"
      ],
      "details": "In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.",
      "id": "GSD-2021-21703",
      "modified": "2023-12-13T01:23:10.846309Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@php.net",
        "DATE_PUBLIC": "2021-10-18T22:40:00.000Z",
        "ID": "CVE-2021-21703",
        "STATE": "PUBLIC",
        "TITLE": "PHP-FPM memory access in root process leading to privilege escalation"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "PHP",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c=",
                          "version_name": "7.3.x",
                          "version_value": "7.3.31"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "7.4.x",
                          "version_value": "7.4.25"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "8.0.X",
                          "version_value": "8.0.12"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "PHP Group"
            }
          ]
        }
      },
      "configuration": [
        {
          "lang": "eng",
          "value": "PHP FPM is being used with the main process having higher privileges than the worker processes. "
        }
      ],
      "credit": [
        {
          "lang": "eng",
          "value": "Reported by Charles Fol"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user."
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-787 Out-of-bounds Write"
              }
            ]
          },
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-284 Improper Access Control"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://bugs.php.net/bug.php?id=81026",
            "refsource": "MISC",
            "url": "https://bugs.php.net/bug.php?id=81026"
          },
          {
            "name": "DSA-4992",
            "refsource": "DEBIAN",
            "url": "https://www.debian.org/security/2021/dsa-4992"
          },
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            "url": "https://www.debian.org/security/2021/dsa-4993"
          },
          {
            "name": "[oss-security] 20211026 CVE-2021-21703: PHP-FPM 5.3.7 \u003c= 8.0.12 Local Root",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/10/26/7"
          },
          {
            "name": "[debian-lts-announce] 20211027 [SECURITY] [DLA 2794-1] php7.0 security update",
            "refsource": "MLIST",
            "url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00021.html"
          },
          {
            "name": "FEDORA-2021-9f68f5f752",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/"
          },
          {
            "name": "FEDORA-2021-4140b54de2",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/"
          },
          {
            "name": "FEDORA-2021-02d218c3be",
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/"
          },
          {
            "name": "https://www.oracle.com/security-alerts/cpujan2022.html",
            "refsource": "MISC",
            "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
          },
          {
            "name": "https://security.netapp.com/advisory/ntap-20211118-0003/",
            "refsource": "CONFIRM",
            "url": "https://security.netapp.com/advisory/ntap-20211118-0003/"
          },
          {
            "name": "https://www.oracle.com/security-alerts/cpuapr2022.html",
            "refsource": "MISC",
            "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
          },
          {
            "name": "GLSA-202209-20",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/202209-20"
          }
        ]
      },
      "source": {
        "defect": [
          "https://bugs.php.net/bug.php?id=81026"
        ],
        "discovery": "EXTERNAL"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
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            "children": [],
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                "cpe23Uri": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
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                "versionEndIncluding": "7.3.31",
                "versionStartIncluding": "7.3.0",
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              },
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                "versionEndExcluding": "8.0.12",
                "versionStartIncluding": "8.0.0",
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              }
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            "operator": "OR"
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          {
            "children": [],
            "cpe_match": [
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              },
              {
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            "operator": "OR"
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          {
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            "cpe_match": [
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                "versionStartIncluding": "8.0.0.0",
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      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security@php.net",
          "ID": "CVE-2021-21703"
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        "data_type": "CVE",
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        "description": {
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            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
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                  "value": "CWE-787"
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          "reference_data": [
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              "name": "https://bugs.php.net/bug.php?id=81026",
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              "tags": [
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                "Patch",
                "Vendor Advisory"
              ],
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              "name": "DSA-4993",
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            },
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            },
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              "refsource": "MLIST",
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              "refsource": "MLIST",
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/"
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            {
              "name": "FEDORA-2021-9f68f5f752",
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              "tags": [
                "Mailing List",
                "Third Party Advisory"
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/"
            },
            {
              "name": "FEDORA-2021-02d218c3be",
              "refsource": "FEDORA",
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20211118-0003/",
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              "url": "https://security.netapp.com/advisory/ntap-20211118-0003/"
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            },
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              "name": "GLSA-202209-20",
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              "tags": [
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              ],
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            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.9,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
            "version": "2.0"
          },
          "exploitabilityScore": 3.4,
          "impactScore": 10.0,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.0,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.0,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2022-10-29T02:44Z",
      "publishedDate": "2021-10-25T06:15Z"
    }
  }
}


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