CVE-2021-28484 Information

Description

An issue was discovered in the /api/connector endpoint handler in Yubico yubihsm-connector before 3.0.1 (in YubiHSM SDK before 2021.04). The handler did not validate the length of the request which can lead to a state where yubihsm-connector becomes stuck in a loop waiting for the YubiHSM to send it data preventing any further operations until the yubihsm-connector is restarted. An attacker can send 0 1 or 2 bytes to trigger this.

CVSS Vector

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

Reference

https://github.com/Yubico/yubihsm-connector/releases https://www.yubico.com/support/security-advisories/ysa-2021-02/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B7Q2KGXSPQEEONAWMFZRVH2TXWX3QPCQ/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5