CVE-2021-34715

Cisco Expressway Series and TelePresence Video Communication Server Image Verification Vulnerability

Severity Score

7.2

*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 image verification function of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to execute code with internal user privileges on the underlying operating system. The vulnerability is due to insufficient validation of the content of upgrade packages. An attacker could exploit this vulnerability by uploading a malicious archive to the Upgrade page of the administrative web interface. A successful exploit could allow the attacker to execute code with user-level privileges (the _nobody account) on the underlying operating system.

Una vulnerabilidad en la función de comprobación de imagen de Cisco Expressway Series y Cisco TelePresence Video Communication Server (VCS) podría permitir a un atacante autenticado remoto ejecutar código con privilegios de usuario interno en el sistema operativo subyacente. La vulnerabilidad es debido a que no se comprueba suficientemente el contenido de los paquetes de actualización. Un atacante podría explotar esta vulnerabilidad cargando un archivo malicioso en la página de actualización de la interfaz web administrativa. Una explotación con éxito podría permitir al atacante ejecutar código con privilegios de nivel de usuario (cuenta the _nobody) en el sistema operativo subyacente.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2021-06-15 CVE Reserved
2021-08-18 CVE Published
2023-11-10 EPSS Updated
2024-11-07 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-347: Improper Verification of Cryptographic Signature

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewver-c6WZPXRx	2023-11-07

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"		Expressway Search vendor "Cisco" for product "Expressway"				<= x8.8.0 Search vendor "Cisco" for product "Expressway" and version " <= x8.8.0"		-		Affected
Cisco Search vendor "Cisco"		Telepresence Video Communication Server Search vendor "Cisco" for product "Telepresence Video Communication Server"				<= x8.8 Search vendor "Cisco" for product "Telepresence Video Communication Server" and version " <= x8.8"		-		Affected