CVE-2021-3737 : Vulnerability Insights and Analysis

A flaw in python could allow a remote attacker to cause an infinite loop, impacting system availability.

Understanding CVE-2021-3737

This CVE identifies a vulnerability in the HTTP client code of python that could be exploited by a remote attacker.

What is CVE-2021-3737?

CVE-2021-3737 is a flaw found in python that could allow a remote attacker, controlling the HTTP server, to cause the client script to enter an infinite loop, consuming CPU time. The primary risk posed by this vulnerability is to the availability of the system.

The Impact of CVE-2021-3737

The vulnerability in python could potentially lead to denial of service by consuming excessive CPU resources due to an infinite loop triggered by a malicious HTTP response.

Technical Details of CVE-2021-3737

This section delves into the specifics of the vulnerability.

Vulnerability Description

The vulnerability arises from improper handling of HTTP responses in the HTTP client code of python, enabling an attacker to manipulate the client script and induce an infinite loop.

Affected Systems and Versions

The flaw impacts all versions up to python v3.10.0b2. However, it has been fixed in python v3.6.14, v3.7.11, v3.8.11, v3.9.6, and v3.10.0b2.

Exploitation Mechanism

An attacker, through a malicious HTTP server, can exploit this vulnerability to trick the python client script into an infinite loop, leading to high CPU consumption.

Mitigation and Prevention

Discover the measures to address and prevent the CVE-2021-3737 vulnerability.

Immediate Steps to Take

Users should update python to the fixed versions to mitigate the risk of exploitation and possible denial of service attacks.

Long-Term Security Practices

Maintain up-to-date software versions, implement network security mechanisms, and monitor for unusual CPU consumption to enhance overall security.

Patching and Updates

Regularly monitor security advisories and apply patches promptly to secure systems against potential vulnerabilities.