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.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| https://seclists.org/bugtraq/2019/Feb/23 | third party advisory mailing list |
| https://www.debian.org/security/2019/dsa-4389 | third party advisory |
| https://www.yubico.com/support/security-advisories/ysa-2019-01/ | patch vendor advisory |
| https://developers.yubico.com/libu2f-host/Release_Notes.html | release notes vendor advisory |
| https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/ | |
| https://security.gentoo.org/glsa/202004-15 | vendor advisory |