CVE Vulnerabilities

CVE-2021-34754

Improper Access Control

Published: Oct 27, 2021 | Modified: Nov 26, 2024
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N
RedHat/V2
RedHat/V3
Ubuntu

Multiple vulnerabilities in the payload inspection for Ethernet Industrial Protocol (ENIP) traffic for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured rules for ENIP traffic. These vulnerabilities are due to incomplete processing during deep packet inspection for ENIP packets. An attacker could exploit these vulnerabilities by sending a crafted ENIP packet to the targeted interface. A successful exploit could allow the attacker to bypass configured access control and intrusion policies that should be activated for the ENIP packet.

Weakness

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Affected Software

Name Vendor Start Version End Version
Firepower_threat_defense Cisco 6.4.0 (including) 6.4.0.13 (excluding)
Firepower_threat_defense Cisco 6.6.0 (including) 6.6.5.1 (excluding)
Firepower_threat_defense Cisco 6.7.0 (including) 6.7.0.3 (excluding)
Firepower_threat_defense Cisco 7.0.0 (including) 7.0.1 (excluding)
Secure_firewall_management_center Cisco 2.9.12 (including) 2.9.12 (including)
Secure_firewall_management_center Cisco 2.9.14.0 (including) 2.9.14.0 (including)
Secure_firewall_management_center Cisco 2.9.16 (including) 2.9.16 (including)
Secure_firewall_management_center Cisco 2.9.17 (including) 2.9.17 (including)
Secure_firewall_management_center Cisco 2.9.18 (including) 2.9.18 (including)

Extended Description

Access control involves the use of several protection mechanisms such as:

When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses:

Potential Mitigations

  • Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
  • Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

References