Publish GHSA-m8vh-v6r6-w7p6

Author: advisory-database[bot]

advisories/github-reviewed/2025/12/GHSA-m8vh-v6r6-w7p6/GHSA-m8vh-v6r6-w7p6.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-m8vh-v6r6-w7p6",
+  "modified": "2025-12-02T00:46:05Z",
+  "published": "2025-12-02T00:46:05Z",
+  "aliases": [
+    "CVE-2025-66305"
+  ],
+  "summary": "Grav vulnerable to Denial of Service via Improper Input Handling in 'Supported' Parameter",
+  "details": "**Endpoint**: `admin/config/system`  \n**Submenu**: `Languages`  \n**Parameter**: `Supported`  \n**Application**: Grav v 1.7.48\n\n---\n\n## Summary\n\nA Denial of Service (DoS) vulnerability was identified in the **\"Languages\"** submenu of the Grav **admin configuration panel** (`/admin/config/system`). Specifically, the `Supported` parameter fails to properly validate user input. If a malformed value is inserted—such as a single forward slash (`/`) or an XSS test string—it causes a fatal regular expression parsing error on the server.\n\nThis leads to application-wide failure due to the use of the `preg_match()` function with an **improperly constructed regular expression**, resulting in the following error:\n\n`preg_match(): Unknown modifier 'o' File: /system/src/Grav/Common/Language/Language.php line 244`\n\nOnce triggered, the site becomes completely unavailable to all users.\n\n---\n\n## Details\n\n- **Vulnerable Endpoint**: `POST /admin/config/system`\n    \n- **Submenu**: `Languages`\n    \n- **Parameter**: `Supported`  \n    \n\nThe application dynamically constructs a regular expression using the contents of the `Supported` field without escaping the input using `preg_quote()` or proper validation. This allows attackers to inject invalid syntax into the regex engine, crashing the application during language resolution.\n\n**Stack trace excerpt**:\n\n`Whoops \\ Exception \\ ErrorException (E_WARNING) preg_match(): Unknown modifier 'o' /system/src/Grav/Common/Language/Language.php244`\n\n---\n\n## Proof of Concept (PoC)\n\n### Payloads:\n\n`/ `\n\n### Steps to Reproduce:\n\n1. Log into the Grav Admin Panel.\n    \n2. Navigate to: **Configuration** → **System** → **Languages**.\n    \n3. Locate the `Supported` field.\n    \n4. Insert one of the payloads above (e.g., a single slash `/`).\n    \n5. Click **Save**.\n\n<img width=\"1897\" height=\"639\" alt=\"Pasted image 20250719183223\" src=\"https://github.com/user-attachments/assets/d3a54a20-d30d-46c6-9015-722f80701cfb\" />\n\n1. Observe: All pages in the application begin throwing a fatal error and become inaccessible.\n\n<img width=\"1802\" height=\"998\" alt=\"Pasted image 20250719175229\" src=\"https://github.com/user-attachments/assets/b16750c2-507f-4c30-a9bb-d07fa92bb777\" />\n\n---\n\n## Impact\n\n- Application-wide Denial of Service (DoS)\n    \n- All login and admin views crash with the same error\n    \n- Potentially exploitable by:\n    \n    - Admin panel users\n        \n    - CSRF if misconfigured        \n    \n\n---\n\n## References\n\n- **CWE-1333**: Improper Regular Expression\n    \n- **CWE-20**: Improper Input Validation\n\n\n## Discoverer\n\n[Marcelo Queiroz](www.linkedin.com/in/marceloqueirozjr) \n\nby [CVE-Hunters](https://github.com/Sec-Dojo-Cyber-House/cve-hunters)",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Packagist",
+        "name": "getgrav/grav"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "1.8.0-beta.27"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-m8vh-v6r6-w7p6"
+    },
+    {
+      "type": "ADVISORY",
+      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66305"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/getgrav/grav/commit/ed640a13143c4177af013cf001969ed2c5e197ee"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/getgrav/grav"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-248"
+    ],
+    "severity": "HIGH",
+    "github_reviewed": true,
+    "github_reviewed_at": "2025-12-02T00:46:05Z",
+    "nvd_published_at": "2025-12-01T22:15:50Z"
+  }
+}