Privilege escalation in Yubico Libu2f-host
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2018-20340 |
| CWE-ID | CWE-120 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software Subscribe |
libu2f-host Universal components / Libraries / Libraries used by multiple products |
| Vendor | Yubico |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Buffer overflow
EUVDB-ID: #VU17735
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 - Buffer overflow
Exploit availability: No
DescriptionThe 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.
MitigationUpdate to version 1.1.7.
Vulnerable software versionslibu2f-host: 0.0.1 - 1.1.6
External linkshttp://www.yubico.com/support/security-advisories/ysa-2019-01
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.
