CVE-2022-31573

Vulnerability

CVE-2022-31573 describes an absolute path traversal vulnerability in the ChainerRL Visualizer, a tool for visualizing reinforcement learning agents. The issue stems from the unsafe use of Flask's send_file function, which does not properly sanitize user-supplied paths, enabling an attacker to access files outside the intended directory [1][2].

Exploitation

An attacker can exploit this by sending crafted HTTP requests to the Flask server, likely without authentication, as the application does not appear to implement access controls [1]. The attacker can specify absolute paths (e.g., /etc/passwd) to retrieve arbitrary files from the server's filesystem [2].

Impact

Successful exploitation allows an attacker to read sensitive files, including configuration files, source code, or system secrets, potentially leading to further compromise of the host system [2][3]. The vulnerability affects all versions of the repository up to and including 0.1.1 [1].

Mitigation

As of the publication date, no official patch has been released for this vulnerability. The only mitigation is to avoid exposing the Visualizer to untrusted networks or to restrict access to trusted users [3].