cvelistv5 - cve-2024-48917

cve-2024-48917

Vulnerability from cvelistv5

Published

2024-11-18 19:48

Modified

2024-11-18 20:15

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The `XmlScanner` class has a scan method which should prevent XXE attacks. However, in a bypass of the previously reported `CVE-2024-47873`, the regexes from the `findCharSet` method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value `encoding="UTF-8"` with `"`, which is matched by the first regex, so that `encoding='UTF-7'` with single quotes `'` in the XML header is not matched by the second regex. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue.

References

▼	URL	Tags
	security-advisories@github.com	https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php
	security-advisories@github.com	https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7cc9-j4mv-vcjp
	security-advisories@github.com	https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing

Impacted products

Vendor

Product

Version

▼

PHPOffice

PhpSpreadsheet

Version: < 1.29.4
Version: >= 2.0.0, < 2.1.3
Version: >= 2.2.0, < 2.3.2
Version: >= 3.3.0, < 3.4.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:phpoffice:phpspreadsheet:-:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "phpspreadsheet",
            "vendor": "phpoffice",
            "versions": [
              {
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                "status": "affected",
                "version": "0",
                "versionType": "custom"
              },
              {
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                "version": "2.0.0",
                "versionType": "custom"
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              {
                "lessThan": "2.3.2",
                "status": "affected",
                "version": "2.2.0",
                "versionType": "custom"
              },
              {
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        "metrics": [
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                "id": "CVE-2024-48917",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
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                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-11-18T20:14:30.431041Z",
                "version": "2.0.3"
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              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-11-18T20:15:55.299Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
      "affected": [
        {
          "product": "PhpSpreadsheet",
          "vendor": "PHPOffice",
          "versions": [
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              "version": "\u003c 1.29.4"
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            },
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          ]
        }
      ],
      "descriptions": [
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          "lang": "en",
          "value": "PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The `XmlScanner` class has a scan method which should prevent XXE attacks. However, in a bypass of the previously reported `CVE-2024-47873`, the regexes from the `findCharSet` method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value `encoding=\"UTF-8\"` with `\"`, which is matched by the first regex, so that `encoding=\u0027UTF-7\u0027` with single quotes `\u0027` in the XML header is not matched by the second regex. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue."
        }
      ],
      "metrics": [
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            "version": "3.1"
          }
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      ],
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              "description": "CWE-611: Improper Restriction of XML External Entity Reference",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
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          "name": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7cc9-j4mv-vcjp",
          "tags": [
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          ],
          "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7cc9-j4mv-vcjp"
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          "url": "https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php"
        },
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        }
      ],
      "source": {
        "advisory": "GHSA-7cc9-j4mv-vcjp",
        "discovery": "UNKNOWN"
      },
      "title": "XXE in PHPSpreadsheet\u0027s XLSX reader"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-48917",
    "datePublished": "2024-11-18T19:48:42.656Z",
    "dateReserved": "2024-10-09T22:06:46.172Z",
    "dateUpdated": "2024-11-18T20:15:55.299Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-48917\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2024-11-18T20:15:05.403\",\"lastModified\":\"2024-11-19T21:57:56.293\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The `XmlScanner` class has a scan method which should prevent XXE attacks. However, in a bypass of the previously reported `CVE-2024-47873`, the regexes from the `findCharSet` method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value `encoding=\\\"UTF-8\\\"` with `\\\"`, which is matched by the first regex, so that `encoding=\u0027UTF-7\u0027` with single quotes `\u0027` in the XML header is not matched by the second regex. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue.\"},{\"lang\":\"es\",\"value\":\"PhpSpreadsheet es una librer\u00eda PHP para leer y escribir archivos de hojas de c\u00e1lculo. La clase `XmlScanner` tiene un m\u00e9todo de escaneo que deber\u00eda evitar ataques XXE. Sin embargo, en una omisi\u00f3n del `CVE-2024-47873` informado anteriormente, las expresiones regulares del m\u00e9todo `findCharSet`, que se utiliza para determinar la codificaci\u00f3n actual, se pueden omitir utilizando un payload en la codificaci\u00f3n UTF-7 y agregando al final del archivo un comentario con el valor `encoding=\\\"UTF-8\\\"` con `\\\"`, que coincide con la primera expresi\u00f3n regular, de modo que `encoding=\u0027UTF-7\u0027` con comillas simples `\u0027` en el encabezado XML no coincida con la segunda expresi\u00f3n regular. Un atacante puede omitir el desinfectante y lograr un ataque de entidad externa XML. Las versiones 1.9.4, 2.1.3, 2.3.2 y 3.4.0 solucionan el problema.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-611\"}]}],\"references\":[{\"url\":\"https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7cc9-j4mv-vcjp\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

ghsa-7cc9-j4mv-vcjp

Vulnerability from github

Published

2024-11-18 20:01

Modified

2024-11-18 22:45

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

XXE in PHPSpreadsheet's XLSX reader

Details

Summary

The XmlScanner class has a scan method which should prevent XXE attacks.

However, we found another bypass than the previously reported CVE-2024-47873, the regexes from the findCharSet method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value encoding="UTF-8" with ", which is matched by the first regex, so that encoding='UTF-7' with single quotes ' in the XML header is not matched by the second regex:

$patterns = [ '/encoding\\s*=\\s*"([^"]*]?)"/', "/encoding\\s*=\\s*'([^']*?)'/", ];

A payload for the workbook.xml file can for example be created with CyberChef&input=Pz4KPCFET0NUWVBFIGZvbyBbCiAgPCFFTEVNRU5UIGZvbyBBTlkgPgogIDwhRU5USVRZIHh4ZSBTWVNURU0gImZpbGU6Ly8vZXRjL3Bhc3N3ZCIgPl0%2BCjxmb28%2BJnh4ZTs8L2Zvbz4K). If you open an Excel file containing the payload from the link above stored in the workbook.xml file with PhpSpreadsheet, you will receive an HTTP request on 127.0.0.1:12345. You can test that an HTTP request is created by running the nc -nlvp 12345 command before opening the file containing the payload with PhpSpreadsheet.

To create the payload you need: 1. Create a file containing <?xml version = "1.0" encoding='UTF-7' in an XML file 2. Use the link attached above to create your XXE payload and add it to the XML file. 3. Add +ADw-+ACE---encoding="UTF-8"--+AD4- to the end of the XML file, which is matched by the first regex.

PoC

payload.xlsx

Create a new folder.
Run the composer require phpoffice/phpspreadsheet command in the new folder.
Create an index.php file in that folder with the following content: ```PHP <?php require 'vendor/autoload.php';

use PhpOffice\PhpSpreadsheet\Spreadsheet; use PhpOffice\PhpSpreadsheet\Writer\Xlsx;

$spreadsheet = new Spreadsheet();

$inputFileType = 'Xlsx'; $inputFileName = './payload.xlsx';

/ Create a new Reader of the type defined in $inputFileType / $reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader($inputFileType); / Advise the Reader that we only want to load cell data / $reader->setReadDataOnly(true);

$worksheetData = $reader->listWorksheetInfo($inputFileName);

foreach ($worksheetData as $worksheet) {

$sheetName = $worksheet['worksheetName'];

echo "

$sheetName

"; / Load $inputFileName to a Spreadsheet Object / $reader->setLoadSheetsOnly($sheetName); $spreadsheet = $reader->load($inputFileName);

$worksheet = $spreadsheet->getActiveSheet(); print_r($worksheet->toArray());

} `` - Run the following command:php -S 127.0.0.1:8080` - Add the payload.xlsx file in the folder and open https://127.0.0.1:8080 in a browser. You will see an HTTP request on netcat http://127.0.0.1:12345/ext.dtd.

Impact

An attacker can bypass the sanitizer and achieve an XXE attack.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.29.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.2.0"
            },
            {
              "fixed": "2.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.3.0"
            },
            {
              "fixed": "3.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-48917"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-11-18T20:01:46Z",
    "nvd_published_at": "2024-11-18T20:15:05Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe [XmlScanner class](https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php) has a [scan](https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php#L72) method which should prevent XXE attacks.\n\nHowever, we found another bypass than the previously reported `CVE-2024-47873`, the regexes from the [findCharSet](https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php#L51) method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value `encoding=\"UTF-8\"` with `\"`, which is matched by the first regex, so that `encoding=\u0027UTF-7\u0027` with single quotes `\u0027` in the XML header is not matched by the second regex: \n\n```\n $patterns = [\n            \u0027/encoding\\\\s*=\\\\s*\"([^\"]*]?)\"/\u0027,\n            \"/encoding\\\\s*=\\\\s*\u0027([^\u0027]*?)\u0027/\",\n        ];\n``` \n\nA payload for the `workbook.xml` file can for example be created with [CyberChef](https://gchq.github.io/CyberChef/#recipe=Encode_text(\u0027UTF-7%20(65000)\u0027)\u0026input=Pz4KPCFET0NUWVBFIGZvbyBbCiAgPCFFTEVNRU5UIGZvbyBBTlkgPgogIDwhRU5USVRZIHh4ZSBTWVNURU0gImZpbGU6Ly8vZXRjL3Bhc3N3ZCIgPl0%2BCjxmb28%2BJnh4ZTs8L2Zvbz4K).\nIf you open an Excel file containing the payload from the link above stored in the `workbook.xml` file with PhpSpreadsheet, you will receive an HTTP request on `127.0.0.1:12345`. You can test that an HTTP request is created by running the `nc -nlvp 12345` command before opening the file containing the payload with PhpSpreadsheet.\n\nTo create the payload you need:\n1. Create a file containing `\u003c?xml version = \"1.0\" encoding=\u0027UTF-7\u0027` in an XML file\n2. Use the link attached above to create your XXE payload and add it to the XML file. \n3. Add `+ADw-+ACE---encoding=\"UTF-8\"--+AD4-` to the end of the XML file, which is matched by the first regex. \n\n### PoC\n\n[payload.xlsx](https://github.com/user-attachments/files/17375792/payload.xlsx)\n\n- Create a new folder.\n- Run the `composer require phpoffice/phpspreadsheet` command in the new folder.\n- Create an `index.php` file in that folder with the following content:\n```PHP\n\u003c?php\nrequire \u0027vendor/autoload.php\u0027;\n\nuse PhpOffice\\PhpSpreadsheet\\Spreadsheet;\nuse PhpOffice\\PhpSpreadsheet\\Writer\\Xlsx;\n\n$spreadsheet = new Spreadsheet();\n\n$inputFileType = \u0027Xlsx\u0027;\n$inputFileName = \u0027./payload.xlsx\u0027;\n\n/**  Create a new Reader of the type defined in $inputFileType  **/\n$reader = \\PhpOffice\\PhpSpreadsheet\\IOFactory::createReader($inputFileType);\n/**  Advise the Reader that we only want to load cell data  **/\n$reader-\u003esetReadDataOnly(true);\n\n$worksheetData = $reader-\u003elistWorksheetInfo($inputFileName);\n\nforeach ($worksheetData as $worksheet) {\n\n$sheetName = $worksheet[\u0027worksheetName\u0027];\n\necho \"\u003ch4\u003e$sheetName\u003c/h4\u003e\";\n/**  Load $inputFileName to a Spreadsheet Object  **/\n$reader-\u003esetLoadSheetsOnly($sheetName);\n$spreadsheet = $reader-\u003eload($inputFileName);\n\n$worksheet = $spreadsheet-\u003egetActiveSheet();\nprint_r($worksheet-\u003etoArray());\n\n}\n```\n- Run the following command: `php -S 127.0.0.1:8080`\n- Add the [payload.xlsx](https://github.com/user-attachments/files/17375792/payload.xlsx) file in the folder and open \u003chttps://127.0.0.1:8080\u003e in a browser. You will see an HTTP request on netcat \u003chttp://127.0.0.1:12345/ext.dtd\u003e.\n\n### Impact\n\nAn attacker can bypass the sanitizer and achieve an [XXE attack](https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing).\n",
  "id": "GHSA-7cc9-j4mv-vcjp",
  "modified": "2024-11-18T22:45:37Z",
  "published": "2024-11-18T20:01:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7cc9-j4mv-vcjp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-48917"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php"
    },
    {
      "type": "WEB",
      "url": "https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "XXE in PHPSpreadsheet\u0027s XLSX reader"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

cve-2024-48917

Vulnerability from cvelistv5

ghsa-7cc9-j4mv-vcjp

Vulnerability from github

Summary

PoC

$sheetName

Impact

Tags

Sightings

Nomenclature