CVE-2021-1370

Cisco IOS XR Software for Cisco 8000 Series Routers and Network Convergence System 540 Series Routers Privilege Escalation Vulnerability

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

A vulnerability in a CLI command of Cisco IOS XR Software for the Cisco 8000 Series Routers and Network Convergence System 540 Series Routers running NCS540L software images could allow an authenticated, local attacker to elevate their privilege to root. To exploit this vulnerability, an attacker would need to have a valid account on an affected device. The vulnerability is due to insufficient validation of command line arguments. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the prompt. A successful exploit could allow an attacker with low-level privileges to escalate their privilege level to root.

Una vulnerabilidad en un comando de CLI de Cisco IOS XR Software, para los Enrutadores Cisco 8000 Series y los Enrutadores Network Convergence System 540 Series que ejecutan imágenes de software de NCS540L, podría permitir a un atacante local autenticado elevar su privilegio a root. Para explotar esta vulnerabilidad, un atacante necesitaría tener una cuenta válida en un dispositivo afectado. La vulnerabilidad es debido a una comprobación insuficiente de los argumentos de la línea de comandos. Un atacante podría explotar esta vulnerabilidad al autenticarse en el dispositivo e ingresar un comando diseñado en el indicador. Una explotación con éxito podría permitir a un atacante con privilegios de bajo nivel escalar su nivel de privilegio a root

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

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

2020-11-13 CVE Reserved
2021-02-04 CVE Published
2023-03-08 EPSS Updated
2024-11-08 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

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-iosxr-pe-QpzCAePe	2021-02-08

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 Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8201 Search vendor "Cisco" for product "8201"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8202 Search vendor "Cisco" for product "8202"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8808 Search vendor "Cisco" for product "8808"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8812 Search vendor "Cisco" for product "8812"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.0.12 Search vendor "Cisco" for product "Ios Xr" and version " < 7.0.12"	-	Affected	in	Cisco Search vendor "Cisco"	8818 Search vendor "Cisco" for product "8818"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8201 Search vendor "Cisco" for product "8201"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8202 Search vendor "Cisco" for product "8202"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8808 Search vendor "Cisco" for product "8808"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8812 Search vendor "Cisco" for product "8812"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 7.1.0 < 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " >= 7.1.0 < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	8818 Search vendor "Cisco" for product "8818"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	< 7.2.1 Search vendor "Cisco" for product "Ios Xr" and version " < 7.2.1"	-	Affected	in	Cisco Search vendor "Cisco"	Ncs 540 Search vendor "Cisco" for product "Ncs 540"	-	-	Safe