A path traversal vulnerability in Atlantis allows authenticated attackers to manipulate system files, posing a significant risk to infrastructure integrity.

The application is susceptible to path traversal (CWE-22) and external control of file paths (CWE-73), enabling an authenticated attacker to perform unauthorized file operations. The attack vector requires the attacker to hold authenticated access to the system.

Successful exploitation allows an attacker to manipulate file paths, potentially resulting in unauthorized data modification or system instability. With a CVSS score of 8.1, this high severity flaw could lead to significant compromise of the Terraform automation pipeline, which often holds broad administrative permissions over cloud infrastructure.

Immediate Action: Upgrade to Atlantis version 0.45.0 or later to apply the security patches provided by the vendor.

Proactive Monitoring: Review web server and application logs for unusual file path patterns or unexpected webhook payloads that deviate from standard Terraform pull request operations.

Compensating Controls: Implement strict network access controls for the Atlantis instance to limit exposure and ensure that only authorized services can trigger webhooks.

Public Exploit Available: Unknown

Given the high severity of this path traversal vulnerability, administrators should prioritize updating their Atlantis deployments immediately. Failure to patch allows for potential manipulation of critical infrastructure configuration files, which could lead to severe security incidents across managed cloud environments.