CVE-2018-20340: Buffer Overflow
First published: Fri Feb 08 2019(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Yubico libu2f-host | =1.1.6 | |
| Debian Debian Linux | =9.0 | |
| debian/libu2f-host | 1.1.9-1 1.1.10-3 | |
| debian/libu2f-host | <=1.1.6-1<=1.1.2-2 | 1.1.7-1 1.1.2-2+deb9u1 |
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Reference Links
- https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/
- https://developers.yubico.com/libu2f-host/Release_Notes.html
- https://seclists.org/bugtraq/2019/Feb/23
- https://security.gentoo.org/glsa/202004-15
- https://www.debian.org/security/2019/dsa-4389
- https://www.yubico.com/support/security-advisories/ysa-2019-01/
- https://github.com/Yubico/libu2f-host/commit/f526546bb29f2ef704ae9850f0f4b41fea7b62a4
- https://github.com/Yubico/libu2f-host/commit/e77a109f8cf60d9eafdf005ab5c851d5f576c01e
- https://security-tracker.debian.org/tracker/CVE-2018-20340
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20340
- http://deb.debian.org/debian/pool/main/libu/libu2f-host/libu2f-host_1.1.2-2.dsc
- https://github.com/Yubico/libu2f-host/commit/4d490bb2c528c351e32837fcdaebd998eb5d3f27
- https://bugs.debian.org/921725
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=921725
Frequently Asked Questions
What is CVE-2018-20340?
CVE-2018-20340 is a vulnerability in Yubico libu2f-host 1.1.6 that allows a malicious token to exploit a buffer overflow.
What is the severity of CVE-2018-20340?
The severity of CVE-2018-20340 is medium with a CVSS score of 6.8.
How does CVE-2018-20340 work?
CVE-2018-20340 works by using unchecked buffers in devs.c to enable a malicious token to execute malicious code through a crafted USB device.
Which software versions are affected by CVE-2018-20340?
Yubico libu2f-host 1.1.6 and Debian Linux 9.0 are affected by CVE-2018-20340.
How can I fix CVE-2018-20340?
To fix CVE-2018-20340, you should update the libu2f-host package to version 1.1.9-1 or 1.1.10-3 for Debian Linux.
- collector/nvd-index
- collector/security-tracker-debian
- collector/debian-bugs
- alias/CVE-2018-20340
- agent/weakness
- agent/references
- agent/severity
- agent/author
- agent/type
- agent/description
- agent/event
- agent/softwarecombine
- agent/first-publish-date
- agent/last-modified-date
- agent/remedy
- agent/tags
- collector/mitre-cve
- source/MITRE
- vendor/yubico
- canonical/yubico libu2f-host
- version/yubico libu2f-host/1.1.6
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- package-manager/debian