vulnwire
6.8med

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.

Published 7 y ago · modified 4 mo ago · JSON

CVSS
6.8
v3.0 · NVD
CISA KEV
No
not known exploited
EPSS
0.5%
percentile 43%
Public exploits
0
none known

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.

Exploit prediction (EPSS)

0.50% probability of exploitation in the next 30 days, higher than 43% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
NVD3.06.8CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD2.04.6AV:L/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

  • seclists.org /bugtraq/2019/Feb/23 · x_refsource_MISC, x_transferred
  • debian.org /security/2019/dsa-4389 · x_refsource_MISC, x_transferred
  • yubico.com /support/security-advisories/ysa-2019-01/ · x_refsource_CONFIRM, x_transferred
  • developers.yubico.com /libu2f-host/Release_Notes.html · x_refsource_CONFIRM, x_transferred
  • blog.inhq.net /posts/yubico-libu2f-host-vuln-part1/ · x_refsource_MISC, x_transferred
  • security.gentoo.org /glsa/202004-15 · vendor-advisory, x_refsource_GENTOO, x_transferred

Sources

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.