CVE-2021-27217

Severity Score

4.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se detectó un problema en la función _send_secure_msg() de Yubico yubihsm-shell versiones hasta de 2.0.3. La función no comprueba correctamente el campo de longitud insertado de un mensaje autenticado recibido del dispositivo. Lecturas fuera de límites llevadas a cabo por la función aes_remove_padding() pueden bloquear el proceso en ejecución, dependiendo del diseño de la memoria. Esto podría ser usado por un atacante para conllevar una denegación de servicio del lado del cliente. El proyecto yubihsm-shell está incluido en el producto YubiHSM 2 SDK

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-02-15 CVE Reserved
2021-03-04 CVE Published
2024-02-21 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (3)

URL	Tag	Source
https://github.com/Yubico/yubihsm-shell/releases	Release Notes

URL	Date	SRC
https://blog.inhq.net/posts/yubico-libyubihsm-vuln2	2024-08-03

URL	Date	SRC

URL	Date	SRC
https://www.yubico.com/support/security-advisories/ysa-2021-01	2021-03-26

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Yubico Search vendor "Yubico"		Yubihsm-shell Search vendor "Yubico" for product "Yubihsm-shell"				<= 2.0.3 Search vendor "Yubico" for product "Yubihsm-shell" and version " <= 2.0.3"		-		Affected