CVE-2020-3416

Cisco IOS XE Software for Cisco ASR 900 Series Route Switch Processor 3 Arbitrary Code Execution Vulnerabilities

Severity Score

6.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

Multiple vulnerabilities in the initialization routines that are executed during bootup of Cisco IOS XE Software for Cisco ASR 900 Series Aggregation Services Routers with a Route Switch Processor 3 (RSP3) installed could allow an authenticated, local attacker with high privileges to execute persistent code at bootup and break the chain of trust. These vulnerabilities are due to incorrect validations by boot scripts when specific ROM monitor (ROMMON) variables are set. An attacker could exploit these vulnerabilities by copying a specific file to the local file system of an affected device and defining specific ROMMON variables. A successful exploit could allow the attacker to run arbitrary code on the underlying operating system (OS) with root privileges. To exploit these vulnerabilities, an attacker would need to have access to the root shell on the device or have physical access to the device.

Múltiples vulnerabilidades en las rutinas de inicialización que son ejecutadas durante el arranque de Cisco IOS XE Software para Cisco ASR 900 Series Aggregation Services Routers con un Route Switch Processor 3 (RSP3) instalado podrían permitir a un atacante local autenticado con altos privilegios ejecutar código persistente en el arranque y romper la cadena de confianza. Estas vulnerabilidades son debido a comprobaciones incorrectas para scripts de arranque cuando son configuradas variables específicas del monitor ROM (ROMMON). Un atacante podría explotar estas vulnerabilidades al copiar un archivo específico en el sistema de archivos local de un dispositivo afectado y definiendo variables ROMMON específicas. Una explotación con éxito podría permitir al atacante ejecutar código arbitrario en el sistema operativo (SO) subyacente con privilegios root. 
Para explotar estas vulnerabilidades, un atacante necesitaría contar con acceso al shell root del dispositivo o contar con acceso físico al dispositivo.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2019-12-12 CVE Reserved
2020-09-24 CVE Published
2023-03-08 EPSS Updated
2024-11-13 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-94: Improper Control of Generation of Code ('Code Injection')
CWE-749: Exposed Dangerous Method or Function

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-iosxe-rsp3-rce-jVHg8Z7c	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	16.12.1 Search vendor "Cisco" for product "Ios Xe" and version "16.12.1"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 902 Search vendor "Cisco" for product "Asr 902"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	16.12.1 Search vendor "Cisco" for product "Ios Xe" and version "16.12.1"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 903 Search vendor "Cisco" for product "Asr 903"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	16.12.1 Search vendor "Cisco" for product "Ios Xe" and version "16.12.1"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 907 Search vendor "Cisco" for product "Asr 907"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	17.2 Search vendor "Cisco" for product "Ios Xe" and version "17.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 902 Search vendor "Cisco" for product "Asr 902"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	17.2 Search vendor "Cisco" for product "Ios Xe" and version "17.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 903 Search vendor "Cisco" for product "Asr 903"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xe Search vendor "Cisco" for product "Ios Xe"	17.2 Search vendor "Cisco" for product "Ios Xe" and version "17.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 907 Search vendor "Cisco" for product "Asr 907"	-	-	Safe