CVE-2021-34761

Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability

Severity Score

6.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges.

Una vulnerabilidad en el software Cisco Firepower Threat Defense (FTD) podría permitir a un atacante local autenticado sobrescribir o añadir datos arbitrarios a los archivos del sistema usando privilegios de nivel de root. El atacante debe tener credenciales administrativas en el dispositivo. Esta vulnerabilidad es debido a una comprobación incompleta de la entrada del usuario para un comando CLI específico. Un atacante podría explotar esta vulnerabilidad al autenticarse en el dispositivo con privilegios administrativos y emitiendo un comando CLI con parámetros de usuario diseñados. Una explotación con éxito podría permitir al atacante sobrescribir o añadir datos arbitrarios a los archivos del sistema usando privilegios de nivel root

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-15 CVE Reserved
2021-10-27 CVE Published
2023-03-08 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-73: External Control of File Name or Path
CWE-668: Exposure of Resource to Wrong Sphere

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-ftd-file-write-SHVcmQVc	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"		Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance"				6.2.3 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.2.3"		-		Affected
Cisco Search vendor "Cisco"		Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance"				6.4.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.4.0"		-		Affected
Cisco Search vendor "Cisco"		Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance"				6.6.1 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.6.1"		-		Affected
Cisco Search vendor "Cisco"		Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance"				6.7.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "6.7.0"		-		Affected
Cisco Search vendor "Cisco"		Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance"				7.0.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "7.0.0"		-		Affected
Cisco Search vendor "Cisco"		Firepower Management Center Virtual Appliance Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance"				7.1.0 Search vendor "Cisco" for product "Firepower Management Center Virtual Appliance" and version "7.1.0"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.4.0 < 6.4.0.13 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.4.0 < 6.4.0.13"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.6.0 < 6.6.5 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.6.0 < 6.6.5"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.7.0 < 6.7.0.3 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.7.0 < 6.7.0.3"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 7.0.0 < 7.0.1 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 7.0.0 < 7.0.1"		-		Affected
Cisco Search vendor "Cisco"		Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center"				6.2.3 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.2.3"		-		Affected
Cisco Search vendor "Cisco"		Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center"				6.4.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.4.0"		-		Affected
Cisco Search vendor "Cisco"		Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center"				6.6.1 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.6.1"		-		Affected
Cisco Search vendor "Cisco"		Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center"				6.7.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "6.7.0"		-		Affected
Cisco Search vendor "Cisco"		Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center"				7.0.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "7.0.0"		-		Affected
Cisco Search vendor "Cisco"		Sourcefire Defense Center Search vendor "Cisco" for product "Sourcefire Defense Center"				7.1.0 Search vendor "Cisco" for product "Sourcefire Defense Center" and version "7.1.0"		-		Affected