CVE-2017-16535 - Out-of-bounds Read

Severity

72%

Complexity

39%

Confidentiality

165%

The usb_get_bos_descriptor function in drivers/usb/core/config.c in the Linux kernel before 4.13.10 allows local users to cause a denial of service (out-of-bounds read and system crash) or possibly have unspecified other impact via a crafted USB device.

CVSS 3.0 Base Score 6.6. CVSS Attack Vector: physical. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

CVSS 2.0 Base Score 7.2. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C).

Demo Examples

Out-of-bounds Read

CWE-125

In the following code, the method retrieves a value from an array at a specific array index location that is given as an input parameter to the method


               }
                     return value;// check that the array index is less than the maximum// length of the array
                           value = array[index];// get the value at the specified index of the array
// if array index is invalid then output error message// and return value indicating errorvalue = -1;

However, this method only verifies that the given array index is less than the maximum length of the array but does not check for the minimum value (CWE-839). This will allow a negative value to be accepted as the input array index, which will result in a out of bounds read (CWE-125) and may allow access to sensitive memory. The input array index should be checked to verify that is within the maximum and minimum range required for the array (CWE-129). In this example the if statement should be modified to include a minimum range check, as shown below.


               ...// check that the array index is within the correct// range of values for the array

Overview

First reported 7 years ago

2017-11-04 01:29:00

Last updated 6 years ago

2018-08-24 10:29:00

Affected Software

Linux Kernel

References

102022

https://github.com/torvalds/linux/commit/1c0edc3633b56000e18d82fc241e3995ca18a69e

Patch, Third Party Advisory

https://groups.google.com/d/msg/syzkaller/tzdz2fTB1K0/OvjIgLSTAgAJ

Third Party Advisory

[debian-lts-announce] 20171210 [SECURITY] [DLA 1200-1] linux security update

USN-3754-1

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