BLACKBERRY PWNAGE THE BLUEJAY STRIKES

Transcription

1 BLACKBERRY PWNAGE THE BLUEJAY STRIKES Federico Muttis Core Security Technologies Session ID: HTA-T19 Session Classification: Advanced

2 THE MEDIA

3 THE MEDIA

4 THE MEDIA

5 BLACKBERRY DEVICES WITH KNOWN WORKING EXPLOIT Vulnerable devices (shortened list) Pearl family Curve family (< 9350) Storm family Style 9670 Tour 9630 Bold 9650/9700/9780 Torch 9800

6 CVE ARBITRARY READ

7 CVE PROOF OF CONCEPT CSS Font Face Parsing Type Confusion Vulnerability

8 IEEE 754 DOUBLE PRECISION FLOATING-POINT

9 CVE CRASH ANALYSIS CSS Font Face Parsing Type Confusion Vulnerability 002ed chrome_ !wtf::stringimpl::create(wchar_t * characters = 0x "--- memory read error at address 0x ", unsigned int length = 0x2cb)+0x24 99] chrome_ !wtf::string::string(wchar_t * characters = 0x "--- memory read error at address 0x ", unsigned int length = 0x )+0x21

10 CVE EXPLOITATION CSS Font Face Parsing Type Confusion Vulnerability Address Size

11 CVE EXPLOITATION CSS Font Face Parsing Type Confusion Vulnerability Address Size

12 A BLUEJAY APPEARS!

13 DUMPING THE VIRTUAL ADDRESS SPACE BlueJay s early problems Poor man s solution

14 BLUEJAY AGENT DIAGRAM BlueJay Agent HTTP Push BlueJay Server & Console Exploit dispatcher Memory manager Memory read Pointer Leak Execute code HTML5 Spray HTML5 Edit

15 DUMPING THE VIRTUAL ADDRESS SPACE BlueJay s helper Java BlackBerry App. Browser running? No Yes Restart browser Reset backlight timer

16 DUMPING DEMO

17 DISASSEMBLING AND SEARCHING FOR OLYMPIA BlackBerry s WebKit Browser main() routine

18 DISASSEMBLING AND LOCATING CVE CVE Arbitrary memory read disassembly

19 BLACKBERRY PROCESS INTERNALS Some syscalls (work in progress...) 0x4 write 0x16 allocexecmem 0x28 shmget 0x2b alloc 0x27 loadlibrary 0x29 shmat 0x2c sem_create 0x2d sem_unlink sem_close 0x41 sendto? 0x46 mkfifo? 0x4a unlink 0x4c mkdir 0x5f open 0x61 lock related (flock/lockf?) 0x67 threads related

20 CVE CODE EXECUTION

21 SEARCHING FOR THE VULNERABILITIES Webkit Integer Overflow near 2011 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 -

22 EXPLOITING CVE CVE Integer Overflow => Heap Overflow Integer Overflow Heap Overflow

23 DISASSEMBLING AND LOCATING CVE CVE Integer Overflow

24 DISASSEMBLING AND LOCATING CVE CVE Integer Overflow

25 DISASSEMBLING AND LOCATING CVE CVE Integer Overflow => Heap Overflow

26 DISASSEMBLING AND LOCATING CVE CVE Integer Overflow => Heap Overflow

27 CHAINING THE EXPLOITS

28 EXPLOITATION RECIPE 1. HTML5-Spray the process s heap with a repeated pattern

29 EXPLOITATION RECIPE 1. HTML5-Spray the process s heap with a repeated pattern 2. Leak a heap pointer using CVE Pointer to a valid heap address

30 EXPLOITATION RECIPE 1. HTML5-Spray the process s heap with a repeated pattern 2. Leak a heap pointer using CVE Walk between [ptr-128k, ptr+128k] looking for the signature Pointer to a valid heap address Pointer to HTML5-Sprayed block ignature signature signature signature signature signature signat HTML5-Spray block

31 EXPLOITATION RECIPE 1. HTML5-Spray the process s heap with a repeated pattern 2. Leak a heap pointer using CVE Walk between [ptr-128k, ptr+128k] looking for the signature 4. HTML5-Spray-Modify to fake a vtable Pointer to HTML5-Sprayed block ignature sigptr+x signature sigptr+y signature signature shellcode signature signature signat HTML5-Spray block

32 EXPLOITATION RECIPE 1. HTML5-Spray the process s heap with a repeated pattern 2. Leak a heap pointer using CVE Walk between [ptr-128k, ptr+128k] looking for the signature 4. HTML5-Spray-Modify to fake a vtable 5. Point the code execution exploit to your block 6. Achieve code execution! sigptr+x sigptr+y shellcode HTML5-Spray block

33 BLUEJAY VS REAL DEVICE sigptr sigptr shellcode HTML5-Spray block

34 BLUEJAY VS SIMULATOR DEMO

35 SIMULATOR VS DEVICE WebKit s StyleElement::process()

36 Q & A fmuttis@gmail.com / acid@coresecurity.com