Aviatrix Controller is a cloud network management platform that simplifies complex networking tasks on public clouds such as AWS, Azure, and Google Cloud. Network administrators use it to manage and monitor cloud infrastructure from a single console, ensuring secure and reliable connectivity. The platform is widely adopted for its ability to automate and orchestrate cloud networking, making it a critical component in many enterprise environments.
CVE-2021-40870 is an unrestricted file upload vulnerability in Aviatrix Controller versions 6.x prior to 6.5-1804.1922. This flaw arises from insufficient validation of uploaded file types, allowing attackers to upload dangerous files such as web shells. Combined with a directory traversal weakness, the vulnerability enables an unauthenticated attacker to place malicious files in arbitrary locations on the server, leading to remote code execution.
The vulnerability specifically affects the file upload functionality within the Aviatrix Controller web interface. An attacker can craft a request to the vulnerable endpoint, manipulating the file path parameter to traverse directories and overwrite critical system files. By uploading a malicious script, the attacker can execute arbitrary commands on the underlying operating system with the privileges of the web server process.
If exploited, this vulnerability can have severe consequences, including full compromise of the Aviatrix Controller instance. An attacker could gain unauthorized access to sensitive cloud configuration data, deploy ransomware, or use the compromised system as a pivot point for further attacks on the cloud environment. The high CVSS score of 9.8 reflects the critical nature of this flaw and the potential for widespread damage.
- Upgrade Aviatrix Controller to version 6.5-1804.1922 or later, which includes the security patch for CVE-2021-40870.
- Implement strict file upload validation to allow only safe file types and reject dangerous extensions like .jsp, .php, or .war.
- Apply input sanitization and path traversal prevention techniques to ensure uploaded files cannot be written outside the intended directory.
- Restrict network access to the Aviatrix Controller web interface using firewalls or VPNs to limit exposure to untrusted users.
- Enable logging and monitoring for file upload activities, and set up alerts for suspicious patterns such as directory traversal attempts.
- Conduct regular vulnerability scans using tools like S4E to identify and remediate unpatched instances promptly.
- Review and harden the web server configuration to disable unnecessary features and reduce the attack surface.
- Implement the principle of least privilege for the web server process to minimize the impact of a successful exploit.
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