CVE-2021-34787

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.

CVSS v3 5.3 MEDIUM
CVSS v2.0 4.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

4.3^/10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:M/Au:N/C:N/I:P/A:N

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:cisco:adaptive_security_appliance::::::::
	cpe:2.3:a:cisco:firepower_threat_defense::::::::
	cpe:2.3:a:cisco:firepower_threat_defense::::::::
	cpe:2.3:a:cisco:firepower_threat_defense::::::::
	cpe:2.3:a:cisco:firepower_threat_defense::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::
	cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::

Configuration 2 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5512-x_firmware:009.009:::::::*
	cpe:2.3:o:cisco:asa_5512-x_firmware:009.012:::::::*

cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*

Configuration 3 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5505_firmware:009.009:::::::*
	cpe:2.3:o:cisco:asa_5505_firmware:009.012:::::::*

cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*

Configuration 4 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5515-x_firmware:009.009:::::::*
	cpe:2.3:o:cisco:asa_5515-x_firmware:009.012:::::::*

cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:*

Configuration 5 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5525-x_firmware:009.009:::::::*
	cpe:2.3:o:cisco:asa_5525-x_firmware:009.012:::::::*

cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:*

Configuration 6 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5545-x_firmware:009.009:::::::*
	cpe:2.3:o:cisco:asa_5545-x_firmware:009.012:::::::*

cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:*

Configuration 7 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5555-x_firmware:009.009:::::::*
	cpe:2.3:o:cisco:asa_5555-x_firmware:009.012:::::::*

cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:*

Configuration 8 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5580_firmware:009.009:::::::*
	cpe:2.3:o:cisco:asa_5580_firmware:009.012:::::::*

cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:*

Configuration 9 (hide)

AND

OR	cpe:2.3:o:cisco:asa_5585-x_firmware:009.009:::::::*
	cpe:2.3:o:cisco:asa_5585-x_firmware:009.012:::::::*

cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:*

History

16 Aug 2023, 16:17

Type	Values Removed	Values Added
CPE		cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::

29 Oct 2021, 12:31

Type	Values Removed	Values Added
References	~~(CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY -~~	(CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY - Vendor Advisory
CWE		CWE-755
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : 4.3 v3 : 5.3
CPE		cpe:2.3:h:cisco:asa_5512-x:-:::::::* cpe:2.3:h:cisco:asa_5505:-:::::::* cpe:2.3:o:cisco:asa_5545-x_firmware:009.009:::::::* cpe:2.3:a:cisco:adaptive_security_appliance:::::::: cpe:2.3:o:cisco:asa_5515-x_firmware:009.009:::::::* cpe:2.3:o:cisco:asa_5585-x_firmware:009.012:::::::* cpe:2.3:h:cisco:asa_5555-x:-:::::::* cpe:2.3:o:cisco:asa_5512-x_firmware:009.009:::::::* cpe:2.3:h:cisco:asa_5525-x:-:::::::* cpe:2.3:h:cisco:asa_5545-x:-:::::::* cpe:2.3:o:cisco:asa_5580_firmware:009.012:::::::* cpe:2.3:o:cisco:asa_5515-x_firmware:009.012:::::::* cpe:2.3:o:cisco:asa_5555-x_firmware:009.009:::::::* cpe:2.3:h:cisco:asa_5580:-:::::::* cpe:2.3:h:cisco:asa_5515-x:-:::::::* cpe:2.3:o:cisco:asa_5580_firmware:009.009:::::::* cpe:2.3:o:cisco:asa_5555-x_firmware:009.012:::::::* cpe:2.3:o:cisco:asa_5505_firmware:009.009:::::::* cpe:2.3:o:cisco:asa_5525-x_firmware:009.012:::::::* cpe:2.3:o:cisco:asa_5512-x_firmware:009.012:::::::* cpe:2.3:h:cisco:asa_5585-x:-:::::::* cpe:2.3:o:cisco:asa_5585-x_firmware:009.009:::::::* cpe:2.3:o:cisco:asa_5505_firmware:009.012:::::::* cpe:2.3:o:cisco:asa_5525-x_firmware:009.009:::::::* cpe:2.3:o:cisco:asa_5545-x_firmware:009.012:::::::* cpe:2.3:a:cisco:firepower_threat_defense::::::::

27 Oct 2021, 20:15

Type	Values Removed	Values Added
Summary	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.	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.

27 Oct 2021, 19:35

Type	Values Removed	Values Added
New CVE

Information

Published : 2021-10-27 19:15

Updated : 2024-02-04 22:08

NVD link : CVE-2021-34787

Mitre link : CVE-2021-34787

CVE.ORG link : CVE-2021-34787

JSON object : View

Products Affected

cisco

adaptive_security_appliance
firepower_threat_defense
asa_5512-x_firmware
asa_5545-x
asa_5555-x_firmware
asa_5585-x
asa_5525-x
asa_5585-x_firmware
asa_5545-x_firmware
asa_5580_firmware
asa_5505_firmware
asa_5515-x
asa_5525-x_firmware
asa_5505
asa_5515-x_firmware
adaptive_security_appliance_software
asa_5555-x
asa_5512-x
asa_5580

CWE

CWE-755

Improper Handling of Exceptional Conditions

CWE-183

Permissive List of Allowed Inputs

5.3 /10

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

4.3 /10

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

JSON object

Attach tags to CVE-2021-34787

5.3^/10

4.3^/10

Attach tags to `CVE-2021-34787`