CVE-2020-24387

Severity Score

7.5

*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 yh_create_session() function of yubihsm-shell through 2.0.2. The function does not explicitly check the returned session id from the device. An invalid session id would lead to out-of-bounds read and write operations in the session array. This could be used by an attacker to cause a denial of service attack.

Se detectó un problema en la función yh_create_session() de yubihsm-shell versiones hasta 2.0.2. La función no comprueba explícitamente el ID de sesión devuelto por el dispositivo. Un id de sesión no válido conllevaría a operaciones de lectura y escritura fuera de límites en la matriz de sesión. Esto podría ser usado por un atacante para causar un ataque de denegación de servicio

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-08-19 CVE Reserved
2020-10-19 CVE Published
2023-11-08 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-125: Out-of-bounds Read
CWE-787: Out-of-bounds Write

CAPEC

References (5)

URL	Tag	Source
https://github.com/Yubico/yubihsm-shell	Third Party Advisory

URL	Date	SRC
https://blog.inhq.net/posts/yubico-libyubihsm-vuln	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://developers.yubico.com/yubihsm-shell	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO	2023-11-07
https://www.yubico.com/support/security-advisories/ysa-2020-06	2023-11-07

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"				<= 2.0.2 Search vendor "Yubico" for product "Yubihsm-shell" and version " <= 2.0.2"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected