CVE-2021-34787
Cisco ASA/FTD Bypass of Access Control List Rules
Description
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.
INFO
Published Date :
Oct. 27, 2021, 7:15 p.m.
Last Modified :
Nov. 7, 2023, 3:36 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-34787 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-34787
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-34787.
| URL | Resource |
|---|---|
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY | Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Набор скриптов для парсинга агрегаторов уязвимостей и выгрузки информации в YouTrack
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-34787 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-34787 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Removed CVSS V3 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Added CVSS V3.1 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N -
CPE Deprecation Remap by [email protected]
Aug. 16, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions from (including) 9.16.0 from (excluding) 9.16.1.28 OR *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.16.0 from (excluding) 9.16.1.28 -
CPE Deprecation Remap by [email protected]
Aug. 16, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions from (including) 9.9.0 from (excluding) 9.12.4.25 OR *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.9.0 from (excluding) 9.12.4.25 -
CPE Deprecation Remap by [email protected]
Aug. 16, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions from (including) 9.13.0 from (excluding) 9.14.3.1 OR *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.13.0 from (excluding) 9.14.3.1 -
CPE Deprecation Remap by [email protected]
Aug. 16, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions from (including) 9.15.0 from (excluding) 9.15.1.17 OR *cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* versions from (including) 9.15.0 from (excluding) 9.15.1.17 -
Initial Analysis by [email protected]
Oct. 29, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Changed Reference Type https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY No Types Assigned https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY Vendor Advisory Added CWE NIST CWE-755 Added CPE Configuration OR *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions up to (excluding) 9.8.4.40 *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions from (including) 9.9.0 up to (excluding) 9.12.4.25 *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions from (including) 9.13.0 up to (excluding) 9.14.3.1 *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions from (including) 9.15.0 up to (excluding) 9.15.1.17 *cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* versions from (including) 9.16.0 up to (excluding) 9.16.1.28 *cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* versions up to (excluding) 6.4.0.13 *cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* versions from (including) 6.5.0 up to (excluding) 6.6.5 *cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* versions from (including) 6.7.0 up to (excluding) 6.7.0.3 *cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* versions from (including) 7.0.0 up to (excluding) 7.0.1 Added CPE Configuration AND OR *cpe:2.3:o:cisco:asa_5512-x_firmware:009.009:*:*:*:*:*:*:* *cpe:2.3:o:cisco:asa_5512-x_firmware:009.012:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:asa_5505_firmware:009.009:*:*:*:*:*:*:* *cpe:2.3:o:cisco:asa_5505_firmware:009.012:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:asa_5515-x_firmware:009.009:*:*:*:*:*:*:* *cpe:2.3:o:cisco:asa_5515-x_firmware:009.012:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:asa_5525-x_firmware:009.009:*:*:*:*:*:*:* *cpe:2.3:o:cisco:asa_5525-x_firmware:009.012:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:asa_5545-x_firmware:009.009:*:*:*:*:*:*:* *cpe:2.3:o:cisco:asa_5545-x_firmware:009.012:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:asa_5555-x_firmware:009.009:*:*:*:*:*:*:* *cpe:2.3:o:cisco:asa_5555-x_firmware:009.012:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:asa_5580_firmware:009.009:*:*:*:*:*:*:* *cpe:2.3:o:cisco:asa_5580_firmware:009.012:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:cisco:asa_5585-x_firmware:009.009:*:*:*:*:*:*:* *cpe:2.3:o:cisco:asa_5585-x_firmware:009.012:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Oct. 27, 2021
Action Type Old Value New Value Changed Description 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.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-34787 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-34787
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.13 }} 0.02%
score
0.48187
percentile