Vulnerability Monitor

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CVE-2018-20340

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.

Published

2019-03-21T16:00:35.983

Last Modified

2024-11-21T04:01:16.463

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 6.8 (MEDIUM)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:P/A:P

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

3.9

Impact Score

6.4

Weaknesses

Type: Primary
CWE-119

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	yubico	libu2f-host	1.1.6	Yes
Operating System	debian	debian_linux	9.0	Yes

References

https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/ ([email protected])
https://developers.yubico.com/libu2f-host/Release_Notes.html Release Notes, Vendor Advisory ([email protected])
https://seclists.org/bugtraq/2019/Feb/23 Mailing List, Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/202004-15 ([email protected])
https://www.debian.org/security/2019/dsa-4389 Third Party Advisory ([email protected])
https://www.yubico.com/support/security-advisories/ysa-2019-01/ Patch, Vendor Advisory ([email protected])
https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/ (af854a3a-2127-422b-91ae-364da2661108)
https://developers.yubico.com/libu2f-host/Release_Notes.html Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://seclists.org/bugtraq/2019/Feb/23 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/202004-15 (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2019/dsa-4389 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.yubico.com/support/security-advisories/ysa-2019-01/ Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)