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Iblessing - An iOS Security Exploiting Toolkit, It Mainly Includes Application Information Collection, Static Analysis And Dynamic Analysis


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iblessing
  • iblessing is an iOS security exploiting toolkit, it mainly includes application information collection, static analysis and dynamic analysis.
  • iblessing is based on unicorn engine and capstone engine.

Features
  • Cross-platform: Tested on macOS and Ubuntu.
  • iOS App static info extract, including metadata, deeplinks, urls, etc.
  • Mach-O parser and dyld symbol bind simulator
  • Objective-C class realizing and parsing
  • Scanners making dynamic analysis for arm64 assembly code and find key information or attack surface
  • Scanners using unicorn to partially simulate Mach-O arm64 code execution and find some features
  • Generators that can provide secondary processing on scanner's report to start a query server, or generate script for IDA
  • Super objc_msgSend Xrefs Scanner
    • objc method and subs (such as block) emulation to generate xrefs like flare-emu
    • objc function wrapper detect and ida usercall generate
    • objc_msgSend sub functions analysis
    • objc block to objc_msgSend xrefs in args and capture list
    • report format including json, etc.
  • Diagnostic logs
  • Tests
  • More flexible scanner infrastructure for new scanner plugins
  • Swift class and method parsing
  • More scanners and generators
  • Cross-platform

Support
unicorn may crash (segment fault or bus error) on some computers, I am trying to solve this problem. If you encounter any problems, you can contact me, thank you
In case you need support regarding iblessing or anything associated with it, you can:
  • create an issue and provide necessary information
  • contact Sou1gh0st on Twitter
  • send mail to xiuyutong1994#163.com
  • send mail to xiuyutong1994#gmail.com

Changelog
  • 2020.08.11 - Now iblessing is a cross-platform tool, support both macOS and Linux
  • 2020.08.08 - Improve objc_msgSend xref scanner, add sub xref supoort, including block arguments and capture list
  • 2020.07.30 - Improve symbol-wrapper scanner, and add ida scripts for symbol wrapper rename and prototype modification
  • 2020.07.21 - First release

Get started
Sometimes unicorn will crash on start when doing huge memory mapping, you can try to run it again, if it still can't work, please contact me or create an issue, thanks.
  1. You can download the pre-released iblessing binary and enjoy it.
  2. run chmod +x for the binary
  3. For more tutorails, please check the Documentation & Help below.

How to Build

CMake
  • Platform: macOS, Linux
To get started compiling iblessing, please follow the steps below:
git clone --recursive -j4 https://github.com/Soulghost/iblessing
cd iblessing
./compile-cmake.sh

XcodeBuild
  • Platform: macOS
To get started compiling iblessing, please follow the steps below:
git clone --recursive -j4 https://github.com/Soulghost/iblessing
cd iblessing
./compile.sh

Shortcuts
If there are any errors, you can manully compile capstone and unicorn, then drag libcapstone.a and libunicorn.a to the Xcode project's vendor/libs.
If all of this run successfully, you can find the binary in build directory:
> ls ./build
iblessing

> file ./build/iblessing
./build/iblessing: Mach-O 64-bit executable x86_64

Documentation & Help

Preview
$ iblessing -h

☠️
██╗██████╗ ██╗ ███████╗███████╗███████╗██╗███╗ ██╗ ██████╗
██║██╔══██╗██║ ██╔════╝██╔════╝██╔════╝██║████╗ ██║██╔════╝
██║██████╔╝██║ █████╗ ███████╗███████╗██║██╔██╗ ██║██║ ███╗
██║██╔══██╗██║ ██╔══╝ ╚════██║╚════██║██║██║╚██╗██║██║ ██║
██║██████╔╝███████╗███████╗███████║███████║██║██║ ╚████║╚██████╔╝
╚═╝╚═════╝ ╚══════╝╚══════╝╚══════╝╚══════╝╚═╝╚═╝ ╚═══╝ ╚═════╝

[***] iblessing iOS Security Exploiting Toolkit Beta 0.1.1 (http://blog.asm.im)
[***] Author: Soulghost (高级页面仔) @ (https://github.com/Soulghost)

Usage: iblessing [options...]
Options:
-m, --mode mode selection:
* scan: use scanner
* generator: use generator
-i, --identifier choose module by identifier:
* <scanner-id>: use specific scanner
* <generator-id>: use specific generator
-f, --file input file path
-o, --output output file path
-l, --list list available scanners
-d, --data extra data
-h, --help Shows this page

Basic Concepts

Scanner
A scanner is a component used to output analysis report through static and dynamic analysis of binary files, for example, the objc-msg-xref scanner can dynamiclly analyze most objc_msgSend cross references.
[*] Scanner List:
- app-info: extract app infos
- objc-class-xref: scan for class xrefs
- objc-msg-xref: generate objc_msgSend xrefs record
- predicate: scan for NSPredicate xrefs and sql injection surfaces
- symbol-wrapper: detect symbol wrappers

Generator
A generator is a component that performs secondary processing on the report generated by the scanner, for example, it can generate IDA scripts based on the the objc-msg-xref scanner's cross references report.
[*] Generator List:
- ida-objc-msg-xref: generator ida scripts to add objc_msgSend xrefs from objc-msg-xref scanner's report
- objc-msg-xref-server: server to query objc-msg xrefs
- objc-msg-xref-statistic: statistics among objc-msg-send reports

Basic Usage

Scan for AppInfos
> iblessing -m scan -i app-info -f <path-to-app-bundle>
Let's take WeChat as an example:
> iblessing -m scan -i app-info -f WeChat.app
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat.app
[*] start App Info Scanner
[+] find default plist file Info.plist!
[*] find version info: Name: 微信(WeChat)
Version: 7.0.14(18E226)
ExecutableName: WeChat
[*] Bundle Identifier: com.tencent.xin
[*] the app allows HTTP requests **without** exception domains!
[+] find app deeplinks
|-- wechat://
|-- weixin://
|-- fb290293790992170://
|-- weixinapp://
|-- prefs://
|-- wexinVideoAPI://
|-- QQ41C152CF://
|-- wx703://
|-- weixinULAPI://
[*] find app callout whitelist
|-- qqnews://
|-- weixinbeta://
|-- qqnewshd://
|-- qqmail://
|-- whatsapp://
|-- wxwork://
|-- wxworklocal://
|-- wxcphonebook://
|-- mttbrowser://
|-- mqqapi://
|-- mqzonev2://
|-- qqmusic://
|-- tenvideo2://
...
[+] find 507403 string literals in binary
[*] process with string literals, this maybe take some time
[+] find self deeplinks URLs:
|-- weixin://opennativeurl/devicerankview
|-- weixin://dl/offlinepay/?appid=%@
|-- weixin://opennativeurl/rankmyhomepage
...
[+] find other deeplinks URLs:
|-- wxpay://f2f/f2fdetail
|-- file://%@?lang=%@&fontRatio=%.2f&scene=%u&version=%u&type=%llu&%@=%d&qqFaceFolderPath=%@&platform=iOS&netType=%@&query=%@&searchId=%@&isHomePage=%d&isWeAppMore=%d&subType=%u&extParams=%@&%@=%@&%@=%@
...
[*] write report to path /opt/one-btn/tmp/apps/WeChat/Payload/WeChat.app_info.iblessing.txt

> ls -alh
[email protected] 1 soulghost wheel 29K Jul 23 14:01 WeChat.app_info.iblessing.txt

Scan for Class XREFs
Notice: ARM64 Binaries Only
iblessing -m scan -i objc-class-xref -f <path-to-binary> -d 'classes=<classname_to_scan>,<classname_to_scan>,...'
> restore-symbol WeChat -o WeChat.restored
> iblessing -m scan -i objc-class-xref -f WeChat.restored -d 'classes=NSPredicate'
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat
[+] detect mach-o header 64
[+] detect litten-endian
[*] start Objc Class Xref Scanner
[*] try to find _OBJC_CLASS_$_NSPredicate
[*] Step 1. locate class refs
[+] find _OBJC_CLASS_$_NSPredicate at 0x108eb81d8
[*] Step 2. find __TEXT,__text
[+] find __TEXT,__text at 0x4000
[*] Step 3. scan in __text
[*] start disassembler at 0x100004000
[*] \ 0x1002e1a50/0x1069d9874 (2.71%) [+] find _OBJC_CLASS_$_NSPredicate ref at 0x1002e1a54
...
[*] Step 4. symbolicate ref addresses
[+] _OBJC_CLASS_$_NSPredicate -|
[+] find _OBJC_CLASS_$_NSPredicate ref -[WCW atchNotificationMgr addYoCount:contact:type:] at 0x1002e1a54
[+] find _OBJC_CLASS_$_NSPredicate ref -[NotificationActionsMgr handleSendMsgResp:] at 0x1003e0e28
[+] find _OBJC_CLASS_$_NSPredicate ref -[FLEXClassesTableViewController searchBar:textDidChange:] at 0x1004a090c
[+] find _OBJC_CLASS_$_NSPredicate ref +[GameCenterUtil parameterValueForKey:fromQueryItems:] at 0x1005a823c
[+] find _OBJC_CLASS_$_NSPredicate ref +[GameCenterUtil getNavigationBarColorForUrl:defaultColor:] at 0x1005a8cd8
...

Scan for All objc_msgSend XREFs
Notice: ARM64 Binaries Only

Simple Mode
iblessing -m scan -i objc-msg-xref -f <path-to-binary>

Anti-Wrapper Mode
iblessing -m scan -i objc-msg-xref -f WeChat -d 'antiWrapper=1'
The anti-wrapper mode will detect objc_msgSend wrappers and make transforms, such as:
; __int64 __usercall [email protected]<X0>(void *[email protected]<X0>, const char *[email protected]<X22>, id [email protected]<X20>, ...)  objc_msgSend_X0_X22_X20:  MOV             X1, X22  MOV             X2, X20  B               objc_msgSend  

Usage Example:
; __int64 __usercall [email protected]<X0>(void *[email protected]<X0>, const char *[email protected]<X22>, id [email protected]<X20>, ...)
objc_msgSend_X0_X22_X20:
MOV X1, X22
MOV X2, X20
B objc_msgSend
The report can be used by the generators, now let's go.

Generate objc_msgSend Xrefs Query Server
You can start a server through iblessing's objc-msg-xref-server generator to query all objc_msgSend xrefs.
> iblessing -m scan -i objc-msg-xref -f WeChat -d 'antiWrapper=1'
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat
[+] detect mach-o header 64
[+] detect litten-endian

[*] !!! Notice: enter anti-wrapper mode, start anti-wrapper scanner
[*] start Symbol Wrapper Scanner
[*] try to find wrappers for_objc_msgSend
[*] Step1. find __TEXT,__text
[+] find __TEXT,__text at 0x100004000
[+] mapping text segment 0x100000000 ~ 0x107cb0000 to unicorn engine
[*] Step 2. scan in __text
[*] start disassembler at 0x100004000
[*] / 0x1069d986c/0x1069d9874 (100.00%)
[*] reach to end of __text, stop
[+] anti-wrapper finished

[*] start ObjcMethodXrefScanner Exploit Scanner
[*] Step 1. realize all app classes
[*] realize classes 14631/14631 (100.00%)
[+] get 667318 methods to analyze
[*] Step 2. dyld load non-lazy symbols
[*] Step 3. track al l calls
[*] progress: 667318 / 667318 (100.00%)
[*] Step 4. serialize call chains to file
[*] saved to /opt/one-btn/tmp/apps/WeChat/Payload/WeChat_method-xrefs.iblessing.txt

> ls -alh WeChat_method-xrefs.iblessing.txt
-rw-r--r-- 1 soulghost wheel 63M Jul 23 14:46 WeChat_method-xrefs.iblessing.txt

> head WeChat_method-xrefs.iblessing.txt
iblessing methodchains,ver:0.2;
chainId,sel,prefix,className,methodName,prevMethods,nextMethods
182360,0x1008a0ab8,+[A8KeyControl initialize],+,A8KeyControl,initialize,[],[4429#[email protected]#[email protected]#0x1008a10d0]
182343,0x1008a0ad0,+[A8KeyControl_QueryStringTransferCookie initialize],+,A8KeyControl_QueryStringTransferCookie,initialize,[],[4429#[email protected]#[email protected]#0x1008a10d0]
145393,0x1008c2220,+[A8KeyResultCookieWriter initWithDomain:weakWebView:andCompleteBlock:],+,A8KeyResultCookieWriter,initWithDomain:weakWebView:andCompleteBlock:,[145386#0x1003636 7c],[]
145396,0x1008c3df8,+[A8KeyResultCookieWriter setA8KeyCookieExpireTime:],+,A8KeyResultCookieWriter,setA8KeyCookieExpireTime:,[145386#0x1003636e8],[]
145397,0x1008c27e8,+[A8KeyResultCookieWriter writeCompleteMarkerCookieValue:forKey:],+,A8KeyResultCookieWriter,writeCompleteMarkerCookieValue:forKey:,[145386#0x10036380c],[]
253456,0x0,+[AAOperationReq init],+,AAOperationReq,init,[253455#0x1039a9d30],[]
253457,0x0,+[AAOperationReq setBaseRequest:],+,AAOperationReq,setBaseRequest:,[253455#0x1039a9d8c],[]
186847,0x0,+[AAOperationRes length],+,AAOperationRes,length,[186845#0x10342aa54],[]

Specify the Listening Host and Port
The default listening address is 127.0.0.1:2345, you can specify it by -d option.
iblessing -m generator -i objc-msg-xref-server -f <path-to-report-generated-by-objc-msg-xref-scanner>

Usage Example
Notice: the objc-msg-xref is based on unicorn, to speed up the analyze, we do not follow any calls, so the result is partially missing.
iblessing -m generator -i objc-msg-xref-server -f WeChat_method-xrefs.iblessing.txt -d 'host=0.0.0.0;port=12345'
Next you can open http://127.0.0.1:2345 with a browser to query any objc_msgSend xrefs you like:


Generate IDA Scripts for objc_msgSend xrefs
You can add objc_msgSend xrefs generated from objc-msg-xref scanner to make your reverse engineering journey more faster and comfortable.
> iblessing -m generator -i objc-msg-xref-server -f WeChat_method-xrefs.iblessing.txt
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat_method-xrefs.iblessing.txt
[*] start ObjcMsgXREFServerGenerator
[*] load method-chain db for version iblessing methodchains,ver:0.2;
[*] table keys chainId,sel,prefix,className,methodName,prevMethods,nextMethods
[-] bad line 104467,0x0,+[TPLock P, ],+,TPLock,P, ,[104426#0x1043b9904],[]
[-] bad line 114905,0x0,?[0x108ce1578 (,],?,0x108ce1578,(,,[114900#0x1011e8c68],[]
[-] bad line 104464,0x0,?[? P, ],?,?,P, ,[104426#0x1043b98a8],[]
[-] bad line 139234,0x0,?[? X
[-] bad line ],?,?,X
[-] bad line ,[139205#0x1013c222c],[]
[+] load storage from disk succeeded!
[*] listening on http://127.0.0.1:2345

Usage Example
Notice: the objc-msg-xref is based on unicorn, to speed up the analyze, we do not follow any calls, so the result is partially missing.
iblessing -m generator -i ida-objc-msg-xref -f <path-to-report-generated-by-objc-msg-xref-scanner>
Next open your IDA -> File -> Script File and load the script, this step may take a long time. And when it is done, you can find many xrefs for objc method:


Scan for symbol wrappers
A Mach-O file may contain multiple wrappers of commonly used dynamic library imported symbols, such as:
__text:00000001003842D8 sub_1003842CC                           ; CODE XREF: -[BDARVLynxTracker eventV3:params:adExtraData:]+168↑p  __text:00000001003842D8                                         ; -[BDARVLynxTracker eventV3:params:adExtraData:]+214↑p ...  __text:00000001003842D8                 MOV             X1, X27  __text:00000001003842DC                 MOV             X2, X19  __text:00000001003842E0                 B               objc_msgSend  
We can convert the wrapper by usercall:
__text:00000001003842CC ; id __usercall [email protected]<X0>([email protected]<X23>, const char *@<X28>, ...)  __text:00000001003842CC _objc_msgSend_61                        ; CODE XREF: -[BDARVLynxTracker eventV3:params:adExtraData:]+2CC↑p  __text:00000001003842CC                                         ; -[BDARVLynxTracker eventV3:params:adExtraData:]+320↑p ...  __text:00000001003842CC                 MOV             X0, X23  __text:00000001003842D0                 MOV             X1, X28  __text:00000001003842D4                 B               objc_msgSend  
The scanner can generate a report to record all wrappers, then you can use ida-symbol-wrapper-naming generator to generate ida scripts and implement this wrapper rename and prototype change.

How to Use
> iblessing -m generator -i ida-objc-msg-xref -f WeChat_method-xrefs.iblessing.txt
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat_method-xrefs.iblessing.txt
[*] start IDAObjMsgXREFGenerator
[*] load method-chain db for version iblessing methodchains,ver:0.2;
[*] table keys chainId,sel,prefix,className,methodName,prevMethods,nextMethods
[-] bad line 104467,0x0,+[TPLock P, ],+,TPLock,P, ,[104426#0x1043b9904],[]
[-] bad line 114905,0x0,?[0x108ce1578 (,],?,0x108ce1578,(,,[114900#0x1011e8c68],[]
[-] bad line 104464,0x0,?[? P, ],?,?,P, ,[104426#0x1043b98a8],[]
[-] bad line 139234,0x0,?[? X
[-] bad line ],?,?,X
[-] bad line ,[139205#0x1013c222c],[]
[+] load storage from disk succeeded!
[*] Generating XREF Scripts ...
[*] saved to /opt/one-btn/tmp/apps/WeChat/Payload/WeChat_method-xrefs.iblessing.txt_ida_objc_msg_xrefs.iblessing.py

> ls -alh WeChat_method- xrefs.iblessing.txt_ida_objc_msg_xrefs.iblessing.py
-rw-r--r-- 1 soulghost wheel 23M Jul 23 16:16 WeChat_method-xrefs.iblessing.txt_ida_objc_msg_xrefs.iblessing.py

> head WeChat_method-xrefs.iblessing.txt_ida_objc_msg_xrefs.iblessing.py
def add_objc_xrefs():
ida_xref.add_cref(0x10036367c, 0x1008c2220, XREF_USER)
ida_xref.add_cref(0x1003636e8, 0x1008c3df8, XREF_USER)
ida_xref.add_cref(0x10036380c, 0x1008c27e8, XREF_USER)
ida_xref.add_cref(0x103add16c, 0x700006e187a8, XREF_USER)
ida_xref.add_cref(0x102cbee0c, 0x101143ee8, XREF_USER)
ida_xref.add_cref(0x10085c92c, 0x1005e9360, XREF_USER)
ida_xref.add_cref(0x10085c8bc, 0x1005e9274, XREF_USER)
ida_xref.add_cref(0x10085c8dc, 0x1005e92bc, XREF_USER)
ida_xref.add_cref(0x10085c8cc, 0x1005e9298, XREF_USER)

Usage Example
We will take TikTok China as an example:
__text:00000001003842D8 sub_1003842CC                           ; CODE XREF: -[BDARVLynxTracker eventV3:params:adExtraData:]+168↑p
__text:00000001003842D8 ; -[BDARVLynxTracker eventV3:params:adExtraData:]+214↑p ...
__text:00000001003842D8 MOV X1, X27
__text:00000001003842DC MOV X2, X19
__text:00000001003842E0 B objc_msgSend
Next, we can generate ida scripts from this report.

Genereate IDA Script for Objc Runtime Function Rename and Prototype Modification
__text:00000001003842CC ; id __usercall [email protected]<X0>([email protected]<X23>, const char *@<X28>, ...)
__text:00000001003842CC _objc_msgSend_61 ; CODE XREF: -[BDARVLynxTracker eventV3:params:adExtraData:]+2CC↑p
__text:00000001003842CC ; -[BDARVLynxTracker eventV3:params:adExtraData:]+320↑p ...
__text:00000001003842CC MOV X0, X23
__text:00000001003842D0 MOV X1, X28
__text:00000001003842D4 B objc_msgSend

Usage Example
iblessing -m scan -i symbol-wrapper -f <path-to-binary> -d 'symbols=_objc_msgSend,_objc_retain,_objc_release'
iblessing -m scan -i symbol-wrapper -f <path-to-binary> -d 'symbols=*'
Next open your IDA -> File -> Script File and load the script, this step may take a long time. And when it is done, You can observe some decompiled code changes:




...
http://feedproxy.google.com/~r/PentestTools/~3/Q3c4cB_8CVc/iblessing-ios-security-exploiting.html

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Team Security Diskussion über Iblessing - An iOS Security Exploiting Toolkit, It Mainly Includes Application Information Collection, Static Analysis And Dynamic Analysis