Vulnerability identifier: #VU20806

Vulnerability risk: Low

CVSSv3.1: 2.1 [CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-19985

CWE-ID: CWE-125

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when the function "hso_get_config_data" in "drivers/net/usb/hso.c" reads "if_num" from the USB device (as a u8) and uses it to index a small array. An authenticated local user with physical access to the system can use a malicious USB, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 4.19 - 4.19.12, 4.4.0 - 4.4.169, 4.14 - 4.14.90, 4.9 - 4.9.147

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External links
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.148
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.13
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.91
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.170
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20

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Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.