CVE-2020-7733 : Security Advisory and Response

CVE-2020-7733, also known as Regular Expression Denial of Service (ReDoS), affects the package ua-parser-js before version 0.7.22. This vulnerability poses a risk of ReDoS via the regex for Redmi Phones and Mi Pad Tablets UA.

Understanding CVE-2020-7733

CVE-2020-7733 is a vulnerability in the ua-parser-js package that can lead to Regular Expression Denial of Service (ReDoS) attacks.

What is CVE-2020-7733?

The vulnerability in ua-parser-js before version 0.7.22 allows for ReDoS attacks through the regex for Redmi Phones and Mi Pad Tablets UA.

The Impact of CVE-2020-7733

The impact of this vulnerability is rated as HIGH with a CVSS base score of 7.5. It has a low attack complexity and affects availability significantly.

Technical Details of CVE-2020-7733

CVE-2020-7733 involves the following technical details:

Vulnerability Description

The vulnerability allows for ReDoS attacks via the regex for specific user agents.

Affected Systems and Versions

Product: ua-parser-js
Vendor: n/a
Versions Affected: < 0.7.22

Exploitation Mechanism

The vulnerability can be exploited remotely without requiring privileges or user interaction.

Mitigation and Prevention

To address CVE-2020-7733, consider the following mitigation strategies:

Immediate Steps to Take

Update ua-parser-js to version 0.7.22 or higher to mitigate the vulnerability.
Monitor for any unusual regex patterns in user agents that could indicate a potential attack.

Long-Term Security Practices

Regularly update software dependencies to ensure you are using the latest secure versions.
Implement input validation to prevent malicious regex patterns from causing ReDoS.

Patching and Updates

Stay informed about security alerts and patches related to ua-parser-js to apply updates promptly.