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"Microsoft Internet Explorer 11 - VBScript Execution Policy Bypass in MSHTML"

Author

"Google Security Research"

Platform

windows

Release date

2019-03-19

Release Date Title Type Platform Author
2019-04-19 "Oracle Business Intelligence / XML Publisher 11.1.1.9.0 / 12.2.1.3.0 / 12.2.1.4.0 - XML External Entity Injection" webapps windows "Vahagn Vardanyan"
2019-04-19 "Oracle Business Intelligence 11.1.1.9.0 / 12.2.1.3.0 / 12.2.1.4.0 - Directory Traversal" webapps windows "Vahagn Vardanyan"
2019-04-18 "ManageEngine Applications Manager 11.0 < 14.0 - SQL Injection / Remote Code Execution (Metasploit)" remote windows AkkuS
2019-04-17 "MailCarrier 2.51 - POP3 'RETR' SEH Buffer Overflow" remote windows "Dino Covotsos"
2019-04-17 "DHCP Server 2.5.2 - Denial of Service (PoC)" dos windows "Victor Mondragón"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV PostLuafvPostReadWrite SECTION_OBJECT_POINTERS Race Condition Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cache Manager Poisoning Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV NtSetCachedSigningLevel Device Guard Bypass" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV LuafvCopyShortName Arbitrary Short Name Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cross Process Handle Duplication Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization MAXIMUM_ACCESS DesiredAccess Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 / 1709 - CSRSS SxSSrv Cached Manifest Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Zoho ManageEngine ADManager Plus 6.6 (Build < 6659) - Privilege Escalation" local windows "Digital Interruption"
2019-04-16 "AdminExpress 1.2.5 - 'Folder Path' Denial of Service (PoC)" dos windows "Mücahit İsmail Aktaş"
2019-04-16 "PCHelpWare V2 1.0.0.5 - 'Group' Denial of Service (PoC)" dos windows "Alejandra Sánchez"
2019-04-16 "PCHelpWare V2 1.0.0.5 - 'SC' Denial of Service (PoC)" dos windows "Alejandra Sánchez"
2019-04-15 "MailCarrier 2.51 - POP3 'TOP' SEH Buffer Overflow" remote windows "Dino Covotsos"
2019-04-15 "MailCarrier 2.51 - POP3 'LIST' SEH Buffer Overflow" remote windows "Dino Covotsos"
2019-04-15 "MailCarrier 2.51 - POP3 'USER' Buffer Overflow" remote windows "Dino Covotsos"
2019-04-15 "RemoteMouse 3.008 - Arbitrary Remote Command Execution" remote windows 0rphon
2019-04-15 "MailCarrier 2.51 - 'RCPT TO' Buffer Overflow" remote windows "Dino Covotsos"
2019-04-15 "UltraVNC Launcher 1.2.2.4 - 'Path' Denial of Service (PoC)" dos windows "Victor Mondragón"
2019-04-15 "UltraVNC Viewer 1.2.2.4 - 'VNC Server' Denial of Service (PoC)" dos windows "Victor Mondragón"
2019-04-12 "Microsoft Windows - Contact File Format Arbitary Code Execution (Metasploit)" local windows Metasploit
2019-04-12 "Microsoft Internet Explorer 11 - XML External Entity Injection" local windows hyp3rlinx
2019-04-12 "CyberArk EPM 10.2.1.603 - Security Restrictions Bypass" local windows "Alpcan Onaran"
2019-04-10 "FTPShell Server 6.83 - 'Virtual Path Mapping' Local Buffer" local windows "Dino Covotsos"
2019-04-10 "FTPShell Server 6.83 - 'Account name to ban' Local Buffer" local windows "Dino Covotsos"
2019-04-09 "Microsoft Windows - AppX Deployment Service Privilege Escalation" local windows "Nabeel Ahmed"
2019-04-08 "Download Accelerator Plus (DAP) 10.0.6.0 - SEH Buffer Overflow" local windows "Peyman Forouzan"
Release Date Title Type Platform Author
2019-04-17 "Oracle Java Runtime Environment - Heap Corruption During TTF font Rendering in GlyphIterator::setCurrGlyphID" dos multiple "Google Security Research"
2019-04-17 "Oracle Java Runtime Environment - Heap Corruption During TTF font Rendering in sc_FindExtrema4" dos multiple "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV PostLuafvPostReadWrite SECTION_OBJECT_POINTERS Race Condition Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cache Manager Poisoning Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV NtSetCachedSigningLevel Device Guard Bypass" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV LuafvCopyShortName Arbitrary Short Name Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cross Process Handle Duplication Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization MAXIMUM_ACCESS DesiredAccess Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 / 1709 - CSRSS SxSSrv Cached Manifest Privilege Escalation" local windows "Google Security Research"
2019-04-03 "Google Chrome 72.0.3626.96 / 74.0.3702.0 - 'JSPromise::TriggerPromiseReactions' Type Confusion" remote multiple "Google Security Research"
2019-04-03 "Google Chrome 73.0.3683.39 / Chromium 74.0.3712.0 - 'ReadableStream' Internal Object Leak Type Confusion" dos multiple "Google Security Research"
2019-04-03 "Google Chrome 72.0.3626.81 - 'V8TrustedTypePolicyOptions::ToImpl' Type Confusion" dos multiple "Google Security Research"
2019-04-03 "WebKitGTK+ - 'ThreadedCompositor' Race Condition" dos multiple "Google Security Research"
2019-04-03 "WebKit JavaScriptCore - CodeBlock Dangling Watchpoints Use-After-Free" dos multiple "Google Security Research"
2019-04-03 "WebKit JavaScriptCore - Out-Of-Bounds Access in FTL JIT due to LICM Moving Array Access Before the Bounds Check" dos multiple "Google Security Research"
2019-04-03 "iOS < 12.2 / macOS < 10.14.4 XNU - pidversion Increment During execve is Unsafe" dos multiple "Google Security Research"
2019-04-03 "WebKit JavaScriptCore - 'createRegExpMatchesArray' Type Confusion" dos multiple "Google Security Research"
2019-04-03 "SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion)" dos multiple "Google Security Research"
2019-03-28 "gnutls 3.6.6 - 'verify_crt()' Use-After-Free" dos linux "Google Security Research"
2019-03-26 "Spidermonkey - IonMonkey Type Inference is Incorrect for Constructors Entered via OSR" dos multiple "Google Security Research"
2019-03-25 "VMware Workstation 14.1.5 / VMware Player 15 - Host VMX Process COM Class Hijack Privilege Escalation" local windows "Google Security Research"
2019-03-25 "VMware Workstation 14.1.5 / VMware Player 15.0.2 - Host VMX Process Impersonation Hijack Privilege Escalation" local windows "Google Security Research"
2019-03-22 "snap - seccomp BBlacklist for TIOCSTI can be Circumvented" dos linux "Google Security Research"
2019-03-19 "Google Chrome < M73 - FileSystemOperationRunner Use-After-Free" dos multiple "Google Security Research"
2019-03-19 "Google Chrome < M73 - MidiManagerWin Use-After-Free" dos multiple "Google Security Research"
2019-03-19 "Microsoft Edge - Flash click2play Bypass with CObjectElement::FinalCreateObject" dos windows "Google Security Research"
2019-03-19 "Microsoft VBScript - VbsErase Memory Corruption" dos windows "Google Security Research"
2019-03-19 "Microsoft Internet Explorer 11 - VBScript Execution Policy Bypass in MSHTML" dos windows "Google Security Research"
2019-03-19 "Google Chrome < M73 - Data Race in ExtensionsGuestViewMessageFilter" dos multiple "Google Security Research"
2019-03-19 "Google Chrome < M73 - Double-Destruction Race in StoragePartitionService" dos multiple "Google Security Research"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46567/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46567/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46567/41007/microsoft-internet-explorer-11-vbscript-execution-policy-bypass-in-mshtml/download/", "exploit_id": "46567", "exploit_description": "\"Microsoft Internet Explorer 11 - VBScript Execution Policy Bypass in MSHTML\"", "exploit_date": "2019-03-19", "exploit_author": "\"Google Security Research\"", "exploit_type": "dos", "exploit_platform": "windows", "exploit_port": null}
                                            

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<!--
Windows: Windows: IE11 VBScript execution policy bypass in MSHTML
Platform: Windows 10 1809 (not tested earlier)
Class: Security Feature Bypass

Summary:
MSHTML only checks for the CLSID associated with VBScript when blocking in the Internet Zone, but doesn’t check other VBScript CLSIDs which allow a web page to bypass the security zone policy.

Description:
According to https://blogs.windows.com/msedgedev/2017/07/07/update-disabling-vbscript-internet-explorer-11/, Starting from Windows 10 Fall Creators Update, VBScript execution in IE 11 should be disabled for websites in the Internet Zone and the Restricted Sites Zone by default.

The check for the VBScript security zone policy is done in MSHTML!AllowVBScript which is only called from MSHTML!CScriptCollection::GetHolderCLSID if the script language CLSID matches {b54f3741-5b07-11cf-a4b0-00aa004a55e8}. However, IE still supports the old VBScript.Encode language which has a slightly different CLSID of {b54f3743-5b07-11cf-a4b0-00aa004a55e8}. Therefore to bypass the VBScript zone security policy it’s possible to just change the language attribute in the HTML from “VBScript” to “VBScript.Encode”. To add insult to injury you don’t even need to encode the VBScript as if the engine detects the script is not encoded it tries to parse it as unencoded script.

Proof of Concept:

I’ve provided a PoC as a HTML file with a meta tag to force IE5 compatibility. Just host on an HTTP server.

1) Browse IE11 to the PoC on the web server.

Expected Result:
No VBScript is executed.

Observed Result:
VBScript is executed and a message box is displayed.
-->

<html>
<head>
<meta http-equiv="x-ua-compatible" content="IE=5">
</head>
<body>
<script language="VBScript.Encode">
MsgBox "Hello"
</script>
</body>
</html>