Out-of-bounds write in yubihsm-shell and YubiHSM2 SDK - CVE-2021-43399

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Main Vulnerability Database Vulnerabilities #VU58706

Out-of-bounds write in yubihsm-shell and YubiHSM2 SDK - CVE-2021-43399

Published: December 8, 2021


Vulnerability identifier: #VU58706
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-43399
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the yh_com_sign_ssh_certificate() function of libyubihsm in YubiHSM 2 SDK. A local user can pass specially crafted input via the ‘certify’ command to yubihsm-shell or via the “-a sign-ssh-certificate” command-line flag and crash the running process.


Affected software

yubihsm-shell
YubiHSM2 SDK

How to mitigate CVE-2021-43399

Install updates from vendor's website.

yubihsm-shell - update to 2021.12
YubiHSM2 SDK - update to 2021.12

External References

Related Security Bulletins