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Session ID:
Session Classification: Advanced
HTA-T19
Core Security Technologies
Federico Muttis
BLACKBERRY PWNAGETHE BLUEJAY STRIKES
INFO @ THE MEDIA
▶ http://threatpost.com/en_us/blogs/iphone-blackberry-fall-second-day-pwn2own-031011▶ http://www.zdnet.com/blog/security/pwn2own-2011-blackberry-falls-to-webkit-browser-attack/8401
INFO @ THE MEDIA
INFO @ THE MEDIA
BLACKBERRY DEVICES WITH KNOWN WORKING EXPLOIT
► Vulnerable devices (shortened list)
▶ Pearl family ▶ Curve family (< 9350) ▶ Storm family
▶ Tour 9630▶ Style 9670▶ Bold 9650/9700/9780 ▶ Torch 9800
CVE-2010-4577ARBITRARY READ
► CSS Font Face Parsing Type Confusion Vulnerability
CVE-2010-4577 – PROOF OF CONCEPT
http://code.google.com/p/chromium/issues/detail?id=63866
IEEE 754 DOUBLE PRECISION FLOATING-POINT
► CSS Font Face Parsing Type Confusion Vulnerability
CVE-2010-4577 – CRASH ANALYSIS
002ed594 80000000 01718618 chrome_68390000!WTF::StringImpl::create(wchar_t * characters = 0x80000000 "--- memory read error at address 0x80000000 ---", unsigned int length = 0x2cb)+0x24[c:\b\slave\chrome-official\build\src\third_party\webkit\javascriptcore\wtf\text\stringimpl.cpp @ 99] 80000000 41400000 00000454 chrome_68390000!WTF::String::String(wchar_t * characters = 0x80000000 "--- memory read error at address 0x80000000 ---", unsigned int length = 0x41400000)+0x21
► CSS Font Face Parsing Type Confusion Vulnerability
CVE-2010-4577 – EXPLOITATION
Address Size
► CSS Font Face Parsing Type Confusion Vulnerability
CVE-2010-4577 – EXPLOITATION
Address Size
A BLUEJAY APPEARS!
► BlueJay’s early problems
DUMPING THE VIRTUAL ADDRESS SPACE
▶ Poor man’s solution
BLUEJAY AGENT DIAGRAM
Exploit dispatcher
Memory read Pointer Leak Execute code
BlueJay Server & Console
Memory manager
HTML5Spray
HTML5Edit
HTTP PushBlueJay Agent
► BlueJay’s helper – Java BlackBerry App.
DUMPING THE VIRTUAL ADDRESS SPACE
Browser running?
Yes
Reset backlighttimer
Restart browser
No
DUMPING DEMO
► BlackBerry’s WebKit Browser main() routine
DISASSEMBLING AND SEARCHING FOR OLYMPIA
► CVE-2010-4577 – Arbitrary memory read disassembly
DISASSEMBLING AND LOCATING CVE-2010-4577
BLACKBERRY PROCESS INTERNALS
▶ 0x4 write▶ 0x16 allocexecmem▶ 0x28 shmget▶ 0x2b alloc▶ 0x27 loadlibrary▶ 0x29 shmat▶ 0x2c sem_create▶ 0x2d sem_unlink || sem_close
▶ 0x41 sendto?▶ 0x46 mk"fo?▶ 0x4a unlink▶ 0x4c mkdir▶ 0x5f open▶ 0x61 lock related (#ock/lockf?)▶ 0x67 threads related
▶ Some syscalls (work in progress...)
CVE-2011-1290CODE EXECUTION
► Webkit Integer Over#ow near 2011
SEARCHING FOR THE VULNERABILITIES
There is a buffer overflow vulnerability that was released in November 2010 but is still present on the BlackBerry. (…). To exploit the vulnerability I have to set up the heap in a specifc way so I can overflow a specific structure on the heap. This structure is the internal representation for a piece of text on a website. The vulnerability is in the handling of the text nodes, so this is a good target to overflow. (…)
Once I have a stable way to organize the heap and reliably overflow the pointer to the functions, we can start testing. The first test attempts to redirect execution to code that already exists on the BlackBerry. Instead of the JavaScript nodeType call returning the value 3, I redirect it to existing code elsewhere that returns 0. Now I can control the execution flow in the browser.
Willem Pinckaers -
► CVE-2011-1290 – Integer Over#ow => Heap Over#ow
EXPLOITING CVE-2011-1290
Heap Over#ow
Integer Over#ow
► CVE-2011-1290 – Integer Over#ow
DISASSEMBLING AND LOCATING CVE-2011-1290
► CVE-2011-1290 – Integer Over#ow
DISASSEMBLING AND LOCATING CVE-2011-1290
► CVE-2011-1290 – Integer Over#ow => Heap Over#ow
DISASSEMBLING AND LOCATING CVE-2011-1290
► CVE-2011-1290 – Integer Over#ow => Heap Over#ow
DISASSEMBLING AND LOCATING CVE-2011-1290
CHAINING THE EXPLOITS
EXPLOITATION RECIPE
▶ 1. HTML5-Spray the process’s heap with a repeated pattern
EXPLOITATION RECIPE
▶ 1. HTML5-Spray the process’s heap with a repeated pattern
▶ 2. Leak a heap pointer using CVE-2011-0195
Pointer to a valid heap address
EXPLOITATION RECIPE
▶ 1. HTML5-Spray the process’s heap with a repeated pattern
▶ 2. Leak a heap pointer using CVE-2011-0195
▶ 3. Walk between [ptr-128k, ptr+128k] looking for the signature
Pointer to HTML5-Sprayed block
Pointer to a valid heap address
ignature signature signature signature signature signature signat
HTML5-Spray block
EXPLOITATION RECIPE
▶ 1. HTML5-Spray the process’s heap with a repeated pattern
▶ 2. Leak a heap pointer using CVE-2011-0195
▶ 3. Walk between [ptr-128k, ptr+128k] looking for the signature
sigptr+x sigptr+y shellcode
HTML5-Spray block
▶ 4. HTML5-Spray-Modify to fake a vtable
ignature signature signature signature signature signature signat
Pointer to HTML5-Sprayed block
EXPLOITATION RECIPE
▶ 1. HTML5-Spray the process’s heap with a repeated pattern
▶ 2. Leak a heap pointer using CVE-2011-0195
▶ 3. Walk between [ptr-128k, ptr+128k] looking for the signature
sigptr+x sigptr+y shellcode
HTML5-Spray block
▶ 4. HTML5-Spray-Modify to fake a vtable▶ 5. Point the code execution exploit to your block▶ 6. Achieve code execution!
BLUEJAY VS REAL DEVICE
sigptr sigptr shellcode
HTML5-Spray block
BLUEJAY VS SIMULATOR DEMO
SIMULATOR VS DEVICE
▶ WebKit’s StyleElement::process()
▶ http://immunityinc.com/infiltrate/archives/webkit_heap.pdf
