OS X Keychain EXC_BAD_ACCESS Denial Of Service
Posted on 09 August 2015
# Exploit Title: OSX Keychain - EXC_BAD_ACCESS # Date: 22/07/2015 # Exploit Author: Juan Sacco # Vendor Homepage: https://www.apple.com # Software Link: https://www.apple.com/en/downloads/ # Version: 9.0 (55161) # Tested on: OSX Yosemite 10.10.4 # CVE : None # History - Reported to product-security@apple.com 20 Jul 2015 # Be careful: Crashing the Keychain will affect the user ability to use Keychain stored passwords. # How to reproduce it manually 1. Select a certificate, right click "New certificate preference.." 2. Under "Location or Email address:" add random values +9000 3. Click on Add to conduct the PoC manually # Technically: Performing @selector(addCertificatePreference:) from sender NSButton 0x608000148cf0 # Exception type Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_PROTECTION_FAILURE at 0x00007fff4d866828 External Modification Warnings: VM Regions Near 0x7fff4d866828: MALLOC_SMALL 00007f9e7d000000-00007f9e80000000 [ 48.0M] rw-/rwx SM=PRV --> STACK GUARD 00007fff4c7de000-00007fff4ffde000 [ 56.0M] ---/rwx SM=NUL stack guard for thread 0 Stack 00007fff4ffde000-00007fff507de000 [ 8192K] rw-/rwx SM=COW thread 0 (lldb) Process 490 resuming Process 490 stopped * thread #1: tid = 0x19b7, 0x00007fff92c663c3 Security`SecCertificateSetPreference + 325, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=2, address=0x7fff4d866828) frame #0: 0x00007fff92c663c3 Security`SecCertificateSetPreference + 325 Security`SecCertificateSetPreference: -> 0x7fff92c663c3 <+325>: callq 0x7fff92cf18b2 ; symbol stub for: CFStringGetCString 0x7fff92c663c8 <+330>: movq %rbx, -0x670(%rbp) 0x7fff92c663cf <+337>: testb %al, %al 0x7fff92c663d1 <+339>: jne 0x7fff92c663d8 ; <+346> Process: Keychain Access [598] Path: /Applications/Utilities/Keychain Access.app/Contents/MacOS/Keychain Access Identifier: com.apple.keychainaccess Version: 9.0 (55161) Build Info: KeychainAccess-55161000000000000~620 Code Type: X86-64 (Native) Parent Process: ??? [1] Responsible: Keychain Access [598] User ID: 501 Date/Time: 2015-07-28 13:32:05.183 +0200 OS Version: Mac OS X 10.10.4 (14E46) Report Version: 11 Anonymous UUID: 08523B58-1EF8-DC4A-A7D7-CB31074E4395 Crashed Thread: 0 Dispatch queue: com.apple.main-thread VM Regions Near 0x7fff507776c8: MALLOC_SMALL 00007ff93c800000-00007ff93e000000 [ 24.0M] rw-/rwx SM=PRV --> STACK GUARD 00007fff4e5d7000-00007fff51dd7000 [ 56.0M] ---/rwx SM=NUL stack guard for thread 0 Stack 00007fff51dd7000-00007fff525d7000 [ 8192K] rw-/rwx SM=COW thread 0 rax: 0x0000000001e5e1a0 rbx: 0x0000000000000006 rcx: 0x0000000008000100 rdx: 0x0000000001e5e1a0 rdi: 0x000060000045b6c0 rsi: 0x00007fff507776d0 rbp: 0x00007fff525d5f30 rsp: 0x00007fff507776d0 r8: 0x0000000000000000 r9: 0x00007fff79e6a300 r10: 0x00007ff93c019790 r11: 0x00007fff79147658 r12: 0x000000000000002d r13: 0x00007fff507776d0 r14: 0x00007fff525d5880 r15: 0x00007ff93ae41680 rip: 0x00007fff901083c3 rfl: 0x0000000000010202 cr2: 0x00007fff507776c8
