Vulnerability Description
Yubico libu2f-host 1.1.6 contains unchecked buffers in devs.c, which could enable a malicious token to exploit a buffer overflow. An attacker could use this to attempt to execute malicious code using a crafted USB device masquerading as a security token on a computer where the affected library is currently in use. It is not possible to perform this attack with a genuine YubiKey.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Yubico | Libu2F-Host | 1.1.6 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/
- https://developers.yubico.com/libu2f-host/Release_Notes.htmlRelease NotesVendor Advisory
- https://seclists.org/bugtraq/2019/Feb/23Mailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202004-15
- https://www.debian.org/security/2019/dsa-4389Third Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2019-01/PatchVendor Advisory
- https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/
- https://developers.yubico.com/libu2f-host/Release_Notes.htmlRelease NotesVendor Advisory
- https://seclists.org/bugtraq/2019/Feb/23Mailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202004-15
- https://www.debian.org/security/2019/dsa-4389Third Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2019-01/PatchVendor Advisory
FAQ
What is CVE-2018-20340?
CVE-2018-20340 is a vulnerability with a CVSS score of 6.8 (MEDIUM). Yubico libu2f-host 1.1.6 contains unchecked buffers in devs.c, which could enable a malicious token to exploit a buffer overflow. An attacker could use this to attempt to execute malicious code using ...
How severe is CVE-2018-20340?
CVE-2018-20340 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-20340?
Check the references section above for vendor advisories and patch information. Affected products include: Yubico Libu2F-Host, Debian Debian Linux.