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. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. 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-vuln2ExploitThird Party Advisory
- https://github.com/Yubico/yubihsm-shell/releasesRelease NotesThird Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2021-01/Vendor Advisory
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2ExploitThird Party Advisory
- https://github.com/Yubico/yubihsm-shell/releasesRelease NotesThird Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2021-01/Vendor Advisory
FAQ
What is CVE-2021-27217?
CVE-2021-27217 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-2021-27217?
CVE-2021-27217 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-2021-27217?
Check the references section above for vendor advisories and patch information. Affected products include: Yubico Yubihsm-Shell.