Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Yubico | Yubihsm-Shell | <= 2.0.3 |
Related Weaknesses (CWE)
References
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pExploitThird Party Advisory
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pExploitThird Party Advisory
FAQ
What is CVE-2021-32489?
CVE-2021-32489 is a vulnerability with a CVSS score of 4.4 (MEDIUM). 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 receive...
How severe is CVE-2021-32489?
CVE-2021-32489 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-32489?
Check the references section above for vendor advisories and patch information. Affected products include: Yubico Yubihsm-Shell.