CVE-2021-27217

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 v3.1

4.4 MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0

3.5 LOWAV:N/AC:M/Au:S/C:N/I:N/A:P

EPSS

1.59% chance of exploitation in the next 30 days, 74th percentile

Published

2021-03-04

Updated

2024-08-03

Proof-of-concept exploits (1)

• https://blog.inhq.net/posts/yubico-libyubihsm-vuln2

References

• CVE Record
• NVD entry

Related

• CVE-2021-27216
• CVE-2021-27219
• CVE-2021-27215
• CVE-2021-27224
• CVE-2021-27205
• CVE-2021-27230