A vulnerability was found in Linux Kernel up to 4.6.3 (Operating System). It has been rated as critical. This issue affects the function hiddev_ioctl_usage of the file drivers/hid/usbhid/hiddev.c of the component IOCTL Call Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Multiple heap-based buffer overflows in the hiddev_ioctl_usage function in drivers/hid/usbhid/hiddev.c in the Linux kernel through 4.6.3 allow local users to cause a denial of service or possibly have unspecified other impact via a crafted (1) HIDIOCGUSAGES or (2) HIDIOCSUSAGES ioctl call.

The weakness was shared 06/27/2016 (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2016-5829 since 06/23/2016. The exploitation is known to be easy. Attacking locally is a requirement. A simple authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The following code is the reason for this vulnerability:

else if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
         (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
          uref->usage_index + uref_multi->num_values > field->report_count))
        goto inval;

The vulnerability scanner Nessus provides a plugin with the ID 91927 (Debian DSA-3616-1 : linux - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157314 (Oracle Enterprise Linux Security Update for kernel (ELSA-2016-2574)-Deprecated).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. A possible mitigation has been published 1 weeks after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

if ((cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) &&
    (uref_multi->num_values > HID_MAX_MULTI_USAGES ||
     uref->usage_index + uref_multi->num_values > field->report_count))
        goto inval;

The vulnerability is also documented in the vulnerability database at Tenable (91927).

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.6.0
• 4.6.1
• 4.6.2
• 4.6.3

License

• open-source

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

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