CVEvulnerability
CVE-2021-27217
4.4 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-03-04
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 4.4 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 3.5 LOW — AV:N/AC:M/Au:S/C:N/I:N/A:P
- Weaknesses
- CWE-125
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.
Affected configurations
• yubico yubihsm-shell (<= 2.0.3)
Related
Weakness · CWE (1)
- CWE-125 Out-of-bounds Read weakness
References
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2 Exploit, Third Party Advisory
- https://github.com/Yubico/yubihsm-shell/releases Release Notes, Third Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2021-01/ Vendor Advisory
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2 Exploit, Third Party Advisory
- https://github.com/Yubico/yubihsm-shell/releases Release Notes, Third Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2021-01/ Vendor Advisory