CVE-2020-13131 Information

Description

An issue was discovered in Yubico libykpiv before 2.1.0. lib/util.c in this library (which is included in yubico-piv-tool) does not properly check embedded length fields during device communication. A malicious PIV token can misreport the returned length fields during RSA key generation. This will cause stack memory to be copied into heap allocated memory that gets returned to the caller. The leaked memory could include PINs passwords key material and other sensitive information depending on the integration. During further processing by the caller this information could leak across trust boundaries. Note that RSA key generation is triggered by the host and cannot directly be triggered by the token.

CVSS Vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Reference

https://blog.inhq.net/posts/yubico-libykpiv-vuln/ https://www.yubico.com/products/services-software/download/smart-card-drivers-tools/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

4.3