CVE-2020-7793 : Security Advisory and Response

CVE-2020-7793, also known as Regular Expression Denial of Service (ReDoS), affects the package ua-parser-js before version 0.7.23. This vulnerability can lead to a Regular Expression Denial of Service in multiple regexes.

Understanding CVE-2020-7793

CVE-2020-7793 is a high-severity vulnerability impacting ua-parser-js before version 0.7.23. It was made public on December 11, 2020.

What is CVE-2020-7793?

The vulnerability in ua-parser-js allows for Regular Expression Denial of Service (ReDoS) due to issues in multiple regexes within the package.

The Impact of CVE-2020-7793

The impact of this vulnerability is rated as high, with a CVSS base score of 7.5. It can result in a significant availability impact on affected systems.

Technical Details of CVE-2020-7793

CVE-2020-7793 involves the following technical details:

Vulnerability Description

The vulnerability in ua-parser-js before 0.7.23 can be exploited to cause Regular Expression Denial of Service (ReDoS) through multiple regexes.

Affected Systems and Versions

Product: ua-parser-js
Vendor: Not applicable
Versions affected: < 0.7.23
Version type: Custom

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: None
Exploit Code Maturity: Proof of Concept
Scope: Unchanged

Mitigation and Prevention

To address CVE-2020-7793, consider the following mitigation strategies:

Immediate Steps to Take

Upgrade ua-parser-js to version 0.7.23 or higher to mitigate the vulnerability.
Monitor for any unusual regex processing that could indicate a potential ReDoS attack.

Long-Term Security Practices

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

Patching and Updates

Apply official fixes and patches provided by the ua-parser-js maintainers to address the vulnerability.