CVE-2020-3244

Cisco ASR 5000 Series Aggregation Services Routers Enhanced Charging Service Rule Bypass Vulnerability

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

A vulnerability in the Enhanced Charging Service (ECS) functionality of Cisco ASR 5000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to bypass the traffic classification rules on an affected device. The vulnerability is due to insufficient input validation of user traffic going through an affected device. An attacker could exploit this vulnerability by sending a malformed HTTP request to an affected device. A successful exploit could allow the attacker to bypass the traffic classification rules and potentially avoid being charged for traffic consumption.

Una vulnerabilidad en la funcionalidad Enhanced Charging Service (ECS) de Routers de Servicios de Agregación Cisco ASR 5000 Series, podría permitir a un atacante remoto no autenticado omitir las reglas de clasificación de tráfico sobre un dispositivo afectado. La vulnerabilidad es debido a una comprobación de entrada insuficiente del tráfico de usuarios que atraviesa un dispositivo afectado. Un atacante podría explotar esta vulnerabilidad mediante el envío de una petición HTTP malformada hacia un dispositivo afectado. Una explotación con éxito podría permitir al atacante omitir las reglas de clasificación de tráfico y potencialmente evitar que sea cobrado por el consumo de tráfico

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

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:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2019-12-12 CVE Reserved
2020-06-18 CVE Published
2023-03-07 EPSS Updated
2024-11-15 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr5k-ecs-bypass-2LqfPCL	2021-09-17

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Staros Search vendor "Cisco" for product "Staros"	< 21.18.0 Search vendor "Cisco" for product "Staros" and version " < 21.18.0"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 5000 Search vendor "Cisco" for product "Asr 5000"	-	-	Safe
Cisco Search vendor "Cisco"	Staros Search vendor "Cisco" for product "Staros"	< 21.18.0 Search vendor "Cisco" for product "Staros" and version " < 21.18.0"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 5500 Search vendor "Cisco" for product "Asr 5500"	-	-	Safe
Cisco Search vendor "Cisco"	Staros Search vendor "Cisco" for product "Staros"	< 21.18.0 Search vendor "Cisco" for product "Staros" and version " < 21.18.0"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 5700 Search vendor "Cisco" for product "Asr 5700"	-	-	Safe