CVE-2019-1593

Cisco NX-OS Software Bash Shell Role-Based Access Control Bypass 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 the Bash shell implementation for Cisco NX-OS Software could allow an authenticated, local attacker to escalate their privilege level by executing commands authorized to other user roles. The attacker must authenticate with valid user credentials. The vulnerability is due to the incorrect implementation of a Bash shell command that allows role-based access control (RBAC) to be bypassed. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the Bash prompt. A successful exploit could allow the attacker to escalate their privilege level by executing commands that should be restricted to other roles. For example, a dev-ops user could escalate their privilege level to admin with a successful exploit of this vulnerability.

Una vulnerabilidad en la implementación shell "Bash" del software Cisco NX-OS podría permitir a un atacante local autenticado para escalar su nivel de privilegios ejecutando comandos autorizados a otros roles de usuario. El atacante deberá autenticarse con credenciales de usuario válidas. Esta vulnerabilidad de debe a la implementación de un comando shell "Bash" incorrecta que permite que el control de acceso basado en roles (RBAC) se omita. Un atacante podría explotar esta vulnerabilidad autenticándose en el dispositivo e introduciendo un comando manipulado en el aviso Bash. Una explotación exitosa podría permitir al atacante escalar su nivel de privilegios, ejecutando comandos que deberían estar restringidos a otros roles. Por ejemplo, un usuario dev-ops podría escalar su nivel de privilegios al del administrador con una explotación exitosa de esta vulnerabilidad.

*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

2018-12-06 CVE Reserved
2019-03-06 CVE Published
2023-03-08 EPSS Updated
2024-11-20 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-264: Permissions, Privileges, and Access Controls

CAPEC

References (2)

URL	Tag	Source
http://www.securityfocus.com/bid/107324	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-bash-escal	2020-10-08

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 7.0\(3\)i5 < 7.0\(3\)i7\(4\) Search vendor "Cisco" for product "Nx-os" and version " >= 7.0\(3\)i5 < 7.0\(3\)i7\(4\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 3000 Search vendor "Cisco" for product "Nexus 3000"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 7.0\(3\)i4 < 7.0\(3\)i4\(9\) Search vendor "Cisco" for product "Nx-os" and version " >= 7.0\(3\)i4 < 7.0\(3\)i4\(9\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 3000 Search vendor "Cisco" for product "Nexus 3000"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 7.0\(3\) < 7.0\(3\)i7\(4\) Search vendor "Cisco" for product "Nx-os" and version " >= 7.0\(3\) < 7.0\(3\)i7\(4\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 3500 Search vendor "Cisco" for product "Nexus 3500"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 7.0\(3\) < 7.0\(3\)f3\(5\) Search vendor "Cisco" for product "Nx-os" and version " >= 7.0\(3\) < 7.0\(3\)f3\(5\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 3600 Search vendor "Cisco" for product "Nexus 3600"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 8.1 < 8.2\(3\) Search vendor "Cisco" for product "Nx-os" and version " >= 8.1 < 8.2\(3\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 7000 Search vendor "Cisco" for product "Nexus 7000"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 8.1 < 8.2\(3\) Search vendor "Cisco" for product "Nx-os" and version " >= 8.1 < 8.2\(3\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 7700 Search vendor "Cisco" for product "Nexus 7700"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 8.3 < 8.3\(1\) Search vendor "Cisco" for product "Nx-os" and version " >= 8.3 < 8.3\(1\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 7000 Search vendor "Cisco" for product "Nexus 7000"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 8.3 < 8.3\(1\) Search vendor "Cisco" for product "Nx-os" and version " >= 8.3 < 8.3\(1\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 7700 Search vendor "Cisco" for product "Nexus 7700"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	< 13.2\(4d\) Search vendor "Cisco" for product "Nx-os" and version " < 13.2\(4d\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 9000 In Aci Mode Search vendor "Cisco" for product "Nexus 9000 In Aci Mode"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 14.0 < 14.0\(1h\) Search vendor "Cisco" for product "Nx-os" and version " >= 14.0 < 14.0\(1h\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 9000 In Aci Mode Search vendor "Cisco" for product "Nexus 9000 In Aci Mode"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 7.0\(3\)i4 < 7.0\(3\)i4\(9\) Search vendor "Cisco" for product "Nx-os" and version " >= 7.0\(3\)i4 < 7.0\(3\)i4\(9\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 9000 In Standalone Search vendor "Cisco" for product "Nexus 9000 In Standalone"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 7.0\(3\)i5 < 7.0\(3\)i7\(4\) Search vendor "Cisco" for product "Nx-os" and version " >= 7.0\(3\)i5 < 7.0\(3\)i7\(4\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 9000 In Standalone Search vendor "Cisco" for product "Nexus 9000 In Standalone"	-	-	Safe
Cisco Search vendor "Cisco"	Nx-os Search vendor "Cisco" for product "Nx-os"	>= 7.0\(3\) < 7.0\(3\)f3\(5\) Search vendor "Cisco" for product "Nx-os" and version " >= 7.0\(3\) < 7.0\(3\)f3\(5\)"	-	Affected	in	Cisco Search vendor "Cisco"	Nexus 9500 Search vendor "Cisco" for product "Nexus 9500"	*	-	Safe