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.
References (3)
Core 3
Core References
Release Notes, Third Party Advisory x_refsource_misc
https://github.com/Yubico/yubihsm-shell/releases
Vendor Advisory x_refsource_confirm
https://www.yubico.com/support/security-advisories/ysa-2021-01/
Exploit, Third Party Advisory x_refsource_misc
https://blog.inhq.net/posts/yubico-libyubihsm-vuln2
Scores
CVSS v3
4.4
EPSS
0.0062
EPSS Percentile
70.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-125
Status
published
Products (1)
yubico/yubihsm-shell
< 2.0.3
Published
Mar 04, 2021
Tracked Since
Feb 18, 2026