CVE-2018-20187

Severity Score

5.9

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A side-channel issue was discovered in Botan before 2.9.0. An attacker capable of precisely measuring the time taken for ECC key generation may be able to derive information about the high bits of the secret key, as the function to derive the public point from the secret scalar uses an unblinded Montgomery ladder whose loop iteration count depends on the bitlength of the secret. This issue affects only key generation, not ECDSA signatures or ECDH key agreement.

Se ha detectado un fallo de canal lateral en Botan en versiones anteriores a la 2.9.0. Un atacante que sea capaz de medir con precisión el tiempo que tarda en generarse una clave ECC podría ser capaz de obtener información sobre el alto número de bits de la clave secreta, ya que la función para obtener el punto público del escalar secreto emplea una "escalera de Montgomery", cuya iteración de bucles depende de la longitud de bits del secreto. Esto afecta solamente a la generación de claves y no a las firmas ECDSA y concordancia de claves ECDH.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-12-17 CVE Reserved
2019-01-07 CVE Published
2024-03-01 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-320: Key Management Errors

CAPEC

References (3)

URL	Tag	Source
https://github.com/crocs-muni/ECTester	Not Applicable

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://botan.randombit.net/news.html	2019-03-12
https://botan.randombit.net/security.html	2019-03-12

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Botan Project Search vendor "Botan Project"		Botan Search vendor "Botan Project" for product "Botan"				< 2.9.0 Search vendor "Botan Project" for product "Botan" and version " < 2.9.0"		-		Affected