Vulnerability Details CVE-2021-28484
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 67.3%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References
- https://github.com/Yubico/yubihsm-connector/releases
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B7Q2KGXSPQEEONAWMFZRVH2TXWX3QPCQ/
- https://www.yubico.com/support/security-advisories/ysa-2021-02/
- https://github.com/Yubico/yubihsm-connector/releases
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B7Q2KGXSPQEEONAWMFZRVH2TXWX3QPCQ/
- https://www.yubico.com/support/security-advisories/ysa-2021-02/
Products affected by CVE-2021-28484
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cpe:2.3:a:yubico:yubihsm_connector:-
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cpe:2.3:a:yubico:yubihsm_connector:2.0.0
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cpe:2.3:a:yubico:yubihsm_connector:2.1.0
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cpe:2.3:a:yubico:yubihsm_connector:2.2.0
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cpe:2.3:a:yubico:yubihsm_connector:3.0.0
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cpe:2.3:o:fedoraproject:fedora:34