CVE-2019-16935 : What You Need to Know

Python XML-RPC server in versions 2.7.16, 3.x through 3.6.9, and 3.7.x through 3.7.4 is vulnerable to XSS attacks through the server_title field.

Understanding CVE-2019-16935

The XML-RPC server in Python versions 2.7.16, 3.x through 3.6.9, and 3.7.x through 3.7.4 is susceptible to cross-site scripting (XSS) attacks via the server_title field.

What is CVE-2019-16935?

The vulnerability allows the delivery of arbitrary JavaScript to clients accessing the server via an HTTP URL if the set_server_title function receives untrusted input.

The Impact of CVE-2019-16935

Malicious actors can execute XSS attacks through the server_title field in Python XML-RPC servers.
This could lead to unauthorized access, data theft, and potential manipulation of server-side content.

Technical Details of CVE-2019-16935

Python XML-RPC server vulnerability details.

Vulnerability Description

The issue exists in the Lib/DocXMLRPCServer.py file for Python 2.x and in the Lib/xmlrpc/server.py file for Python 3.x.
Untrusted input in the set_server_title function allows the injection of arbitrary JavaScript to clients.

Affected Systems and Versions

Python versions 2.7.16, 3.x through 3.6.9, and 3.7.x through 3.7.4 are impacted.

Exploitation Mechanism

Attackers can exploit the vulnerability by providing malicious input to the set_server_title function, enabling the execution of unauthorized JavaScript on client-side requests.

Mitigation and Prevention

Protecting systems from CVE-2019-16935.

Immediate Steps to Take

Update Python to the latest patched version to mitigate the XSS vulnerability.
Avoid exposing Python XML-RPC servers to untrusted networks or the public internet.

Long-Term Security Practices

Implement input validation mechanisms to sanitize user inputs and prevent XSS attacks.
Regularly monitor and audit server logs for any suspicious activities.

Patching and Updates

Apply security patches provided by Python to address the XSS vulnerability in the XML-RPC server.