Denial of service in YubiHSM2 SDK

Published: 2020-10-19

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-24387 CVE-2020-24388
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	yubihsm-shell Universal components / Libraries / Programming Languages & Components YubiHSM2 SDK Universal components / Libraries / Programming Languages & Components
Vendor	Yubico

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU47721

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-24387

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within yubihsm-shell library, which is part of the YubiHSM2 SDK. A maliciously-crafted YubiHSM2 device, or someone with access to the HTTP traffic between a client and server handling the device, could cause the yubihsm library to crash.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

yubihsm-shell: 2.0.0 - 2.0.2

YubiHSM2 SDK: 1.0.0 - 2019.12

External links

http://www.yubico.com/support/security-advisories/ysa-2020-06

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Input validation error

EUVDB-ID: #VU47722