CVE-2021-34787

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Identity-Based Rule Bypass Vulnerability

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

A vulnerability in the identity-based firewall (IDFW) rule processing feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass security protections. This vulnerability is due to improper handling of network requests by affected devices configured to use object group search. An attacker could exploit this vulnerability by sending a specially crafted network request to an affected device. A successful exploit could allow the attacker to bypass access control list (ACL) rules on the device, bypass security protections, and send network traffic to unauthorized hosts.

Una vulnerabilidad en la funcionalidad de procesamiento de reglas del firewall basado en la identidad (IDFW) del software Cisco Adaptive Security Appliance (ASA) y del software Cisco Firepower Threat Defense (FTD) podría permitir a un atacante remoto no autenticado omitir las protecciones de seguridad. Esta vulnerabilidad es debido al manejo inapropiado de las peticiones de red por parte de los dispositivos afectados configurados para usar la búsqueda de grupos de objetos. Un atacante podría aprovechar esta vulnerabilidad mediante el envío de una petición de red especialmente diseñada a un dispositivo afectado. Una explotación con éxito podría permitir al atacante omitir las reglas de la lista de control de acceso (ACL) en el dispositivo, omitir las protecciones de seguridad y enviar tráfico de red a hosts no autorizados

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2021-06-15 CVE Reserved
2021-10-27 CVE Published
2024-07-12 EPSS Updated
2024-11-07 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-183: Permissive List of Allowed Inputs
CWE-755: Improper Handling of Exceptional Conditions

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-asaftd-rule-bypass-ejjOgQEY	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"	Asa 5512-x Firmware Search vendor "Cisco" for product "Asa 5512-x Firmware"	009.009 Search vendor "Cisco" for product "Asa 5512-x Firmware" and version "009.009"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5512-x Search vendor "Cisco" for product "Asa 5512-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5512-x Firmware Search vendor "Cisco" for product "Asa 5512-x Firmware"	009.012 Search vendor "Cisco" for product "Asa 5512-x Firmware" and version "009.012"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5512-x Search vendor "Cisco" for product "Asa 5512-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5505 Firmware Search vendor "Cisco" for product "Asa 5505 Firmware"	009.009 Search vendor "Cisco" for product "Asa 5505 Firmware" and version "009.009"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5505 Search vendor "Cisco" for product "Asa 5505"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5505 Firmware Search vendor "Cisco" for product "Asa 5505 Firmware"	009.012 Search vendor "Cisco" for product "Asa 5505 Firmware" and version "009.012"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5505 Search vendor "Cisco" for product "Asa 5505"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5515-x Firmware Search vendor "Cisco" for product "Asa 5515-x Firmware"	009.009 Search vendor "Cisco" for product "Asa 5515-x Firmware" and version "009.009"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5515-x Search vendor "Cisco" for product "Asa 5515-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5515-x Firmware Search vendor "Cisco" for product "Asa 5515-x Firmware"	009.012 Search vendor "Cisco" for product "Asa 5515-x Firmware" and version "009.012"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5515-x Search vendor "Cisco" for product "Asa 5515-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5525-x Firmware Search vendor "Cisco" for product "Asa 5525-x Firmware"	009.009 Search vendor "Cisco" for product "Asa 5525-x Firmware" and version "009.009"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5525-x Search vendor "Cisco" for product "Asa 5525-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5525-x Firmware Search vendor "Cisco" for product "Asa 5525-x Firmware"	009.012 Search vendor "Cisco" for product "Asa 5525-x Firmware" and version "009.012"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5525-x Search vendor "Cisco" for product "Asa 5525-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5545-x Firmware Search vendor "Cisco" for product "Asa 5545-x Firmware"	009.009 Search vendor "Cisco" for product "Asa 5545-x Firmware" and version "009.009"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5545-x Search vendor "Cisco" for product "Asa 5545-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5545-x Firmware Search vendor "Cisco" for product "Asa 5545-x Firmware"	009.012 Search vendor "Cisco" for product "Asa 5545-x Firmware" and version "009.012"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5545-x Search vendor "Cisco" for product "Asa 5545-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5555-x Firmware Search vendor "Cisco" for product "Asa 5555-x Firmware"	009.009 Search vendor "Cisco" for product "Asa 5555-x Firmware" and version "009.009"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5555-x Search vendor "Cisco" for product "Asa 5555-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5555-x Firmware Search vendor "Cisco" for product "Asa 5555-x Firmware"	009.012 Search vendor "Cisco" for product "Asa 5555-x Firmware" and version "009.012"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5555-x Search vendor "Cisco" for product "Asa 5555-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5580 Firmware Search vendor "Cisco" for product "Asa 5580 Firmware"	009.009 Search vendor "Cisco" for product "Asa 5580 Firmware" and version "009.009"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5580 Search vendor "Cisco" for product "Asa 5580"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5580 Firmware Search vendor "Cisco" for product "Asa 5580 Firmware"	009.012 Search vendor "Cisco" for product "Asa 5580 Firmware" and version "009.012"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5580 Search vendor "Cisco" for product "Asa 5580"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5585-x Firmware Search vendor "Cisco" for product "Asa 5585-x Firmware"	009.009 Search vendor "Cisco" for product "Asa 5585-x Firmware" and version "009.009"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5585-x Search vendor "Cisco" for product "Asa 5585-x"	-	-	Safe
Cisco Search vendor "Cisco"	Asa 5585-x Firmware Search vendor "Cisco" for product "Asa 5585-x Firmware"	009.012 Search vendor "Cisco" for product "Asa 5585-x Firmware" and version "009.012"	-	Affected	in	Cisco Search vendor "Cisco"	Asa 5585-x Search vendor "Cisco" for product "Asa 5585-x"	-	-	Safe
Cisco Search vendor "Cisco"		Adaptive Security Appliance Search vendor "Cisco" for product "Adaptive Security Appliance"				< 9.8.4.40 Search vendor "Cisco" for product "Adaptive Security Appliance" and version " < 9.8.4.40"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				< 6.4.0.13 Search vendor "Cisco" for product "Firepower Threat Defense" and version " < 6.4.0.13"		-		Affected
Cisco Search vendor "Cisco"		Firepower Threat Defense Search vendor "Cisco" for product "Firepower Threat Defense"				>= 6.5.0 < 6.6.5 Search vendor "Cisco" for product "Firepower Threat Defense" and version " >= 6.5.0 < 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"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.9.0 < 9.12.4.25 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.9.0 < 9.12.4.25"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.13.0 < 9.14.3.1 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.13.0 < 9.14.3.1"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.15.0 < 9.15.1.17 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.15.0 < 9.15.1.17"		-		Affected
Cisco Search vendor "Cisco"		Adaptive Security Appliance Software Search vendor "Cisco" for product "Adaptive Security Appliance Software"				>= 9.16.0 < 9.16.1.28 Search vendor "Cisco" for product "Adaptive Security Appliance Software" and version " >= 9.16.0 < 9.16.1.28"		-		Affected