CVE-2021-28484
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Yubico Yubihsm Connector
PublishedApr 14, 2021
First seenApr 14, 2021
How to fix
Update
- yubico yubihsm_connector3.0.1 or later
- github.com/Yubico/yubihsm-connector3.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| yubico yubihsm_connector | v < 3.0.1 | 3.0.1 |
| fedoraproject fedora | 34 | — |
| github.com/Yubico/yubihsm-connectorGo | v < 3.0.1 | 3.0.1 |
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