CVE-2020-26116 Explained : Impact and Mitigation

CVE-2020-26116 is a vulnerability found in http.client in Python 3.x versions before specific releases. The issue allows for CRLF injection if the attacker can control the HTTP request method.

Understanding CVE-2020-26116

This CVE identifies a security flaw in Python versions that could lead to CRLF injection under certain conditions.

What is CVE-2020-26116?

CVE-2020-26116 is a vulnerability in Python's http.client module that enables CRLF injection when the attacker has influence over the HTTP request method.

The Impact of CVE-2020-26116

This vulnerability could be exploited by malicious actors to manipulate HTTP requests, potentially leading to various attacks like HTTP response splitting.

Technical Details of CVE-2020-26116

The technical aspects of the CVE provide insight into the nature of the vulnerability.

Vulnerability Description

The flaw in http.client in Python versions before specific releases allows for CRLF injection by inserting control characters in the HTTPConnection.request argument.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Affected Versions: Python 3.x versions before 3.5.10, 3.6.x before 3.6.12, 3.7.x before 3.7.9, and 3.8.x before 3.8.5

Exploitation Mechanism

The vulnerability can be exploited when the attacker controls the HTTP request method, enabling the insertion of CR and LF control characters.

Mitigation and Prevention

Protecting systems from CVE-2020-26116 involves immediate actions and long-term security practices.

Immediate Steps to Take

Update Python to versions 3.5.10, 3.6.12, 3.7.9, or 3.8.5 to mitigate the vulnerability.
Monitor and restrict external input that could influence HTTP request methods.

Long-Term Security Practices

Implement input validation mechanisms to prevent unauthorized characters in HTTP requests.
Regularly review and apply security patches and updates to the Python environment.
Stay informed about security advisories and best practices to enhance overall system security.

Patching and Updates

Ensure timely installation of patches and updates released by Python to address CVE-2020-26116 and other potential vulnerabilities.