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CVE-2021-32489

4.4 · MEDIUM

An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3.

Published May 10, 2021CWE-190EPSS 0.92%

Overview

CVE-2021-32489 is a medium-severity vulnerability. It was published on May 10, 2021 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device because response_msg.st.len=8 can be accepted but triggers an integer overflow, which causes CRYPTO_cbc128_decrypt (in OpenSSL) to encounter an undersized buffer and experience a segmentation fault. The yubihsm-shell project is included in the YubiHSM 2 SDK product.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refblog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pendingRefblog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pending

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32489?

CVE-2021-32489 is a medium-severity vulnerability. It was published on May 10, 2021 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

How severe is CVE-2021-32489?

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-32489?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-32489?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32489 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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