VMware NSX Remote Code Execution (RCE) Scanner

VMware NSX is widely used in the IT industry as a network virtualization and security platform. It is employed by large enterprises and service providers to manage complex network infrastructures. The platform enables organizations to implement micro-segmentation, network monitoring, and dynamic routing. It is essential for environments that demand high levels of security and micro-segmentation over virtual networks. NSX provides integration with various networking and cloud solutions, enhancing flexibility and security. Being critical in virtualized environments, ensuring the software's security is paramount for any organization employing it.

The vulnerability in question involves Remote Code Execution (RCE) through the Apache Log4j framework, a popular logging utility used by many Java applications. Exploiting this flaw could allow an attacker to execute arbitrary code on a server, potentially leading to data leakage or system compromise. The issue is serious as it can be triggered without authentication, resulting in full control over the affected system. This vulnerability is widely recognized and has received significant attention due to its impact on numerous applications utilizing Log4j. Proper mitigation of this vulnerability is crucial to maintaining system integrity and confidentiality.

Technically, the vulnerability lies in the JNDI feature of Log4j used within VMware NSX. Specifically, improper use of the JNDI feature allows for injection of inputs that are interpreted and executed, leading to code execution on the server. Attackers leverage DNS interactions to communicate and manipulate server-side behavior. The template targets the '/login' endpoint and checks for the presence of JNDI lookups in user-controlled inputs. The architecture allows attackers to inject external lookup requests resulting in unauthorized code to be executed remotely.

If successfully exploited, this vulnerability could have disastrous consequences, including unauthorized access and potential compromise of entire network environments. Critical systems could be manipulated to leak private data, install malware, or disrupt services. The possibility of cascading failures exists as attackers gain leverage over network infrastructures. Once an attacker gains a foothold, lateral movement across the network could occur, leading to further unauthorized access to sensitive information. Recognizing and patching this vulnerability is essential to prevent potential breaches and maintain system security.

REFERENCES

• https://kb.vmware.com/s/article/87086
• https://logging.apache.org/log4j/2.x/security.html
• https://nvd.nist.gov/vuln/detail/CVE-2021-44228