Security Advisory YSA-2021-02 - Yubico

2021-02-0300:00:00

Yubico.com

www.yubico.com

5 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

0.002 Low

EPSS

Percentile

57.1%

JSON

The yubihsm-connector utility provides a HTTP interface for interacting with a YubiHSM 2. This interface is used by many other components in the YubiHSM 2 SDK ecosystem, including the yubihsm-shell, the PKCS#11 library (yubihsm_pkcs11), and the YubiHSM Key Storage Provider (KSP) for Windows®.
yubihsm-connector did not properly validate the length of requests, which can lead to a state where it becomes stuck in a loop waiting for the YubiHSM to send it data, preventing any further operations from being performed until the connector is restarted.