CVE-2018-0243

Severity Score

5.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability in the detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass a configured file action policy that is intended to drop the Server Message Block Version 2 (SMB2) and SMB Version 3 (SMB3) protocols if malware is detected. The vulnerability is due to incorrect detection of an SMB2 or SMB3 file based on the total file length. An attacker could exploit this vulnerability by sending a crafted SMB2 or SMB3 transfer request through the targeted device. An exploit could allow the attacker to pass SMB2 or SMB3 files that could be malware even though the device is configured to block them. This vulnerability does not exist for SMB Version 1 (SMB1) files. This vulnerability affects Cisco Firepower System Software when one or more file action policies are configured, on software releases prior to 6.2.3. Cisco Bug IDs: CSCvg68807.

Una vulnerabilidad en el motor de detección de Cisco Firepower System Software podría permitir que un atacante remoto sin autenticar omita una política de archivos que esté configurada para anular los protocolos Server Message Block Version 2 (SMB2) y SMB Version 3 (SMB3) si se detecta malware. La vulnerabilidad se debe a la detección incorrecta de un archivo SMB2 o SMB3 basado en el tamaño total del archivo. Un atacante podría explotar esta vulnerabilidad mediante el envío de una petición de transferencia de SMB2 o SMB3 manipulada al dispositivo objetivo. Un exploit podría permitir que el atacante pase archivos SMB2 o SMB3 que podrían ser malware, incluso aunque el dispositivo esté configurado para bloquearlos. Esta vulnerabilidad no existe para los archivos SMB Version 1 (SMB1). Esta vulnerabilidad afecta a Cisco Firepower System Software cuando una o más políticas de acción de archivos están configuradas en versiones del software anteriores a la 6.2.3. Cisco Bug IDs: CSCvg68807.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-11-27 CVE Reserved
2018-04-19 CVE Published
2024-02-27 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-693: Protection Mechanism Failure

CAPEC

References (2)

URL	Tag	Source
http://www.securityfocus.com/bid/103943	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fss	2019-10-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				< 6.2.3 Search vendor "Cisco" for product "Firepower Threat Defense" and version " < 6.2.3"		-		Affected