CVE-2023-22467 : Vulnerability Insights and Analysis

This CVE involves the Luxon.js inefficient regular expression complexity vulnerability that impacts the Luxon library versions prior to 1.38.1, 2.5.2, and 3.2.1. This vulnerability exposes users to (Re)DoS attacks when specific inputs with lengths above 10k characters are provided.

Understanding CVE-2023-22467

This section will delve into the details of CVE-2023-22467, shedding light on the vulnerability, its impact, technical aspects, and mitigation strategies.

What is CVE-2023-22467?

The Luxon library, utilized for manipulating dates and times in JavaScript, has a vulnerability where the

DateTime.fromRFC2822()

method exhibits quadratic (N^2) complexity under certain inputs. This inefficiency leads to a significant slowdown for inputs exceeding 10k characters, rendering users vulnerable to denial-of-service (DoS) attacks. It's noteworthy that this issue also affects Moment under CVE-2022-31129.

The Impact of CVE-2023-22467

The inefficiency in Luxon's regular expression complexity can be exploited by malicious actors to mount (Re)DoS attacks, potentially disrupting the availability of services utilizing the library. This could result in service downtime and performance degradation.

Technical Details of CVE-2023-22467

The following section will outline the technical aspects of CVE-2023-22467, including vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability stems from Luxon's inefficient regular expression complexity, specifically in the

DateTime.fromRFC2822()

method, leading to a performance bottleneck for inputs with excessive lengths. This inefficiency can be leveraged to launch DoS attacks on systems using Luxon.

Affected Systems and Versions

Luxon versions before 1.38.1, 2.5.2, and 3.2.1 are vulnerable to this issue. Users utilizing Luxon in their JavaScript applications should ensure they are not running these outdated versions to mitigate the risk posed by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted inputs with lengths surpassing 10k characters to the

DateTime.fromRFC2822()

method in Luxon, causing a performance degradation and potentially disrupting the application's functionality.

Mitigation and Prevention

In this section, effective measures to mitigate and prevent exploitation of CVE-2023-22467 will be discussed, including immediate steps, long-term security practices, and the importance of patching and updates.

Immediate Steps to Take

To mitigate the risk posed by CVE-2023-22467, users are advised to update Luxon to versions 1.38.1, 2.5.2, or 3.2.1, which contain patches for this vulnerability. Additionally, limiting the length of inputs to the

DateTime.fromRFC2822()

method can act as a temporary workaround.

Long-Term Security Practices

Maintaining an updated version of Luxon, along with regularly monitoring security advisories and patches, is essential to ensure a secure development environment and protect against emerging vulnerabilities.

Patching and Updates

Regularly check for updates and security advisories from Luxon and related libraries, applying patches promptly to stay protected against known vulnerabilities like CVE-2023-22467. Proactive security practices can safeguard your applications and data from potential threats.