How to Fix CVE-2023-20025 And CVE-2023-20026- Authentication Bypass and Remote Command Execution Vulnerabilities in Cisco Small Business Routers?

The network devices manufacturer giant Cisco published an advisory on 11the January 2023 in which Cisco detailed an authentication bypass and remote code execution vulnerabilities in Cisco small business routers. The vulnerability tracked as CVE-2023-20025 is a Critical severity vulnerability with a CVSS score of 9.0 out of 10. And the vulnerability tracked as CVE-2023-20026 is a Medium severity vulnerability with a CVSS score of 6.5 out of 10. Both the vulnerabilities are actually lice in the web-based management interface of affected Cisco Small Business Routers modules. Since this flaw allows the attacker to bypass authentication or execute arbitrary commands on the underlying operating system of an affected device, it is most important to fix the CVE-2023-20025 and CVE-2023-20026 vulnerabilities. Let’s see how to fix CVE-2023-20025 And CVE-2023-20026, an authentication bypass, and remote command execution vulnerabilities in Cisco Small Business Routers.

A Short Note About Cisco Small Business RV016, RV042, RV042G, and RV082 Routers:

The Cisco Small Business RV016, RV042, RV042G, and RV082 Routers are reliable and secure routers designed to provide businesses with powerful networking solutions. These routers feature advanced security features such as stateful packet inspection (SPI), Denial of Service (DoS) protection, intrusion prevention systems (IPS), Virtual Private Networks (VPNs), and Access Control Lists (ACLs). Furthermore, they offer high-speed Internet connectivity with support for 10/100 Mbps Ethernet, Gigabit Ethernet, and Fast Ethernet. With their robust feature set, these routers allow businesses to easily connect multiple computers, printers, IP phones, and other networked devices in a secure manner.

Summary of CVE-2023-20025

This is an authentication bypass vulnerability in the web-based management interface of a few Cisco small business routers, a small business solution that makes it easy to deploy and manage the WAN connectivity for branch offices, remote employees, and data centers. The flaw is due to improper validation of user input within incoming HTTP packets and could be exploited by sending a crafted HTTP request to the web-based management interface. This vulnerability could enable an unauthenticated, remote attacker to bypass the authentication and gain access to the underlying operating system.

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Associated CVE IDCVE-2023-20025
DescriptionAn Authentication Bypass Vulnerability in Cisco Small Business Routers
Associated ZDI ID
CVSS Score9.0 Critical
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Impact Score
Exploitability Score
Attack Vector (AV)Network
Attack Complexity (AC)High
Privilege Required (PR)None
User Interaction (UI)None
ScopeChanged
Confidentiality (C)High
Integrity (I)High
availability (a)High

Summary of CVE-2023-20026

This is a remote code execution vulnerability in the web-based management interface of a few Cisco small business routers, a small business solution that makes it easy to deploy and manage the WAN connectivity for branch offices, remote employees, and data centers. The flaw is due to improper validation of user input within incoming HTTP packets and could be exploited by sending a crafted HTTP request to the web-based management interface. This vulnerability could enable an authenticated, remote attacker to execute arbitrary commands, gain root-level privileges, and access unauthorized data. To exploit this vulnerability, an attacker should have valid administrative credentials on the affected device.

Associated CVE IDCVE-2023-20026
DescriptionA Remote Code Execution Vulnerability in Cisco Small Business Routers
Associated ZDI ID
CVSS Score6.5 Medium
VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Impact Score
Exploitability Score
Attack Vector (AV)Network
Attack Complexity (AC)Low
Privilege Required (PR)High
User Interaction (UI)None
ScopeUnchanged
Confidentiality (C)High
Integrity (I)High
availability (a)None

Cisco Route Modules Vulnerable to CVE-2023-20025 and CVE-2023-20026

All software releases running on the following list of Cisco RV Series Small Business Routers are affected by these vulnerabilities:

  • RV016 Multi-WAN VPN Routers
  • RV042 Dual WAN VPN Routers
  • RV042G Dual Gigabit WAN VPN Routers
  • RV082 Dual WAN VPN Routers
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Cisco Products Not Vulnerable to CVE-2023-20025 and CVE-2023-20026

Cisco has confirmed that the following Cisco RV Series Small Business Routers are not affected by these vulnerabilities:

  • RV160 VPN Routers
  • RV160W Wireless-AC VPN Routers
  • RV260 VPN Routers
  • RV260P VPN Routers with PoE
  • RV260W Wireless-AC VPN Routers
  • RV320 Dual Gigabit WAN VPN Routers
  • RV325 Dual Gigabit WAN VPN Routers
  • RV340 Dual WAN Gigabit VPN Routers
  • RV340W Dual WAN Gigabit Wireless-AC VPN Routers
  • RV345 Dual WAN Gigabit VPN Routers
  • RV345P Dual WAN Gigabit PoE VPN Routers

How to Fix CVE-2023-20025 And CVE-2023-20026- Authentication Bypass and Remote Command Execution Vulnerabilities in Cisco Small Business Routers?

Cisco has not and will not release software updates that address this vulnerability. There are no workarounds that address this vulnerability. However, administrators may disable the affected feature as described in the Workarounds section.-Cisco

Unfortunately, there are no known workarounds to fully address these vulnerabilities. However, administrators can reduce the risk of exploitation by disabling remote management and blocking access to ports 443 and 60443. Despite this, the routers can be kept accessible within the local area network.

How to Fix CVE-2023-20025 And CVE-2023-20026 on Cisco Routers
Workaround for CVE-2023-20025 And CVE-2023-20026 (Source: Cisco)

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