CVE-2021-39160 : What You Need to Know

nbgitpuller is a Jupyter server extension allowing git repository synchronization to a local path. A vulnerability in versions >= 0.9.0 and < 0.10.2 enables arbitrary code execution via crafted links.

Understanding CVE-2021-39160

A critical vulnerability in nbgitpuller allows attackers to execute arbitrary code by manipulating inputs through malicious links.

What is CVE-2021-39160?

nbgitpuller, a Jupyter server extension, is susceptible to code injection, leading to arbitrary code execution due to unvalidated input handling.

The Impact of CVE-2021-39160

The vulnerability has a CVSS base score of 9.6 (Critical severity) with a high impact on confidentiality, integrity, and availability. No user interaction is required for exploitation.

Technical Details of CVE-2021-39160

The technical aspects of the code injection vulnerability in nbgitpuller are as follows:

Vulnerability Description

CWE-94: Improper Control of Generation of Code ('Code Injection')
Allows malicious code execution through specially crafted links

Affected Systems and Versions

Product: nbgitpuller
Vendor: Jupyterhub
Versions affected: >= 0.9.0, < 0.10.2

Exploitation Mechanism

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed

Mitigation and Prevention

To address CVE-2021-39160, follow these mitigation steps:

Immediate Steps to Take

Upgrade nbgitpuller to version 0.10.2 or newer
Alternatively, restrict access to potentially malicious links

Long-Term Security Practices

Implement input validation mechanisms to prevent code injection
Regularly update and patch software to mitigate known vulnerabilities
Educate users on safe browsing practices and potential risks

Patching and Updates

Upgrade to version 0.10.2 or above to eliminate the code injection vulnerability