Vulnerability identifier: #VU17735

Vulnerability risk: Medium

CVSSv3.1: 6.6 [CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-20340

CWE-ID: CWE-120

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
libu2f-host
Universal components / Libraries / Libraries used by multiple products

Vendor: Yubico

Description

The vulnerability allows a physical attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error. An attacker with a custom made malicious USB device masquerading as a security key, and physical access to a computer where PAM U2F or an application with libu2f-host integrated can trigger buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Update to version 1.1.7.

Vulnerable software versions

libu2f-host: 0.0.1 - 1.1.6

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External links
http://www.yubico.com/support/security-advisories/ysa-2019-01

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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.