CVE-2021-28484: High severity yubico yubihsm connector vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-28484.
What is the affected software?
The affected software is Yubico Yubihsm Connector version up to and excluding 3.0.1.
What is the severity of CVE-2021-28484?
The severity of CVE-2021-28484 is high.
How can this vulnerability be exploited?
This vulnerability can be exploited by sending a request of invalid length to the /api/connector endpoint in Yubico yubihsm-connector.
Are there any references related to this vulnerability?
Yes, you can find references related to this vulnerability at the following links: [GitHub](https://github.com/Yubico/yubihsm-connector/releases), [Fedora Project](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B7Q2KGXSPQEEONAWMFZRVH2TXWX3QPCQ/), [Yubico](https://www.yubico.com/support/security-advisories/ysa-2021-02/).