CVE-2022-20696 in SD-WAN vManage Software
Summary
by MITRE • 09/08/2022
A vulnerability in the binding configuration of Cisco SD-WAN vManage Software containers could allow an unauthenticated, adjacent attacker who has access to the VPN0 logical network to also access the messaging service ports on an affected system. This vulnerability exists because the messaging server container ports on an affected system lack sufficient protection mechanisms. An attacker could exploit this vulnerability by connecting to the messaging service ports of the affected system. To exploit this vulnerability, the attacker must be able to send network traffic to interfaces within the VPN0 logical network. This network may be restricted to protect logical or physical adjacent networks, depending on device deployment configuration. A successful exploit could allow the attacker to view and inject messages into the messaging service, which can cause configuration changes or cause the system to reload.
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Analysis
by VulDB Data Team • 10/14/2022
The vulnerability identified as CVE-2022-20696 resides within the Cisco SD-WAN vManage software containers, specifically targeting the binding configuration of messaging service ports. This security flaw represents a critical configuration oversight that undermines the fundamental network segmentation principles essential for secure software-defined networking environments. The affected system operates under the assumption that the VPN0 logical network provides sufficient isolation, yet the messaging server container ports lack adequate protective mechanisms that would normally prevent unauthorized access. The vulnerability's existence stems from improper network port binding and access control configuration within the containerized environment, creating an attack surface that bypasses expected security boundaries.
The technical exploitation of this vulnerability requires an attacker to possess adjacent network access within the VPN0 logical network, which serves as the initial attack vector. This requirement aligns with the ATT&CK framework's concept of "Network Service Scanning" and "Remote Services" techniques where adversaries must first establish presence within a target network segment before escalating privileges or gaining unauthorized access to critical services. The vulnerability manifests as insufficient port protection mechanisms that allow direct connection to messaging service ports without proper authentication or authorization checks. According to CWE classification, this represents a weakness in the binding configuration that falls under CWE-668, "Exposure of Resource to Wrong Sphere," where network resources are exposed to entities that should not have access.
The operational impact of successfully exploiting CVE-2022-20696 extends beyond simple unauthorized access to potentially catastrophic system consequences. An attacker who gains access to the messaging service ports can perform both passive and active attacks including message interception, modification, and injection. This capability directly violates the principles of data integrity and confidentiality that are fundamental to secure network operations. The ability to inject messages into the messaging service creates opportunities for configuration changes that could compromise the entire SD-WAN infrastructure, potentially leading to system reloads that disrupt network operations and create denial-of-service conditions. The vulnerability's impact is particularly severe because it affects the core messaging infrastructure that facilitates communication between various components of the vManage system.
Mitigation strategies for this vulnerability must address both the immediate configuration issues and the broader security architecture concerns. Network segmentation controls should be enhanced to ensure that even within the VPN0 logical network, appropriate access controls and firewall rules are implemented to restrict access to messaging service ports. The principle of least privilege should be enforced by ensuring that only authorized components can communicate with the messaging service ports. According to industry best practices and the NIST Cybersecurity Framework, implementing network micro-segmentation and mandatory access controls would significantly reduce the attack surface. Organizations should also consider implementing network monitoring solutions that can detect unauthorized access attempts to messaging service ports and establish automated alerting mechanisms. Regular security assessments and penetration testing should be conducted to validate the effectiveness of implemented controls and identify potential configuration drift that could reintroduce similar vulnerabilities. The remediation process should include comprehensive review and reconfiguration of container network bindings, ensuring that messaging service ports are properly secured through authentication mechanisms and access control lists that prevent unauthorized access from adjacent network segments.