PT-2021-17866 · Yubico · Yubihsm Sdk+1

Published 2021-04-14 · Updated 2022-02-15 · CVE-2021-28484

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Yubico yubihsm-connector versions prior to 3.0.1 YubiHSM SDK versions prior to 2021.04

Description: An issue was discovered in the "/api/connector" endpoint handler. 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.

Recommendations: For Yubico yubihsm-connector versions prior to 3.0.1, update to version 3.0.1 or later to resolve the issue. For YubiHSM SDK versions prior to 2021.04, update to version 2021.04 or later to resolve the issue. As a temporary workaround, consider restarting the yubihsm-connector service after detecting the issue to restore functionality.

Fix

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

CVE-2021-28484

GHSA-8M9G-647G-5PXW

Affected Products

Yubihsm Sdk

Yubihsm-Connector

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2021-28484 · Security Note
• https://osv.dev/vulnerability/GHSA-8m9g-647g-5pxw · Vendor Advisory
• https://yubico.com/support/security-advisories/ysa-2021-02 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-28484 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B7Q2KGXSPQEEONAWMFZRVH2TXWX3QPCQ · Vendor Advisory
• https://github.com/Yubico/yubihsm-connector/releases · Note
• https://github.com/Yubico/yubihsm-connector/commit/82bdf202c53460bac9106cc9b4b34a0a16cae0ed · Note
• https://t.me/cvenotify/14714 · Telegram Post