Vulnerability identifier: #VU47721

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
yubihsm-shell
Universal components / Libraries / Programming Languages & Components
YubiHSM2 SDK
Universal components / Libraries / Programming Languages & Components

Vendor: Yubico

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

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

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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.