CVE-2023-26103 : Security Advisory and Response
Learn about CVE-2023-26103 vulnerability in deno before 1.31.0, involving Regular Expression Denial of Service (ReDoS). Take immediate steps to update and prevent potential exploitation.
This CVE-2023-26103 vulnerability involves Regular Expression Denial of Service (ReDoS) in versions of the package deno before 1.31.0. It poses a medium severity risk with a base score of 5.3.
Understanding CVE-2023-26103
This section will delve into the details of the CVE-2023-26103 vulnerability in deno before version 1.31.0.
What is CVE-2023-26103?
CVE-2023-26103 refers to a vulnerability in deno versions prior to 1.31.0 that allows for Regular Expression Denial of Service (ReDoS) due to the upgradeWebSocket function containing problematic regexes, which can be exploited to significantly slow down a web socket server.
The Impact of CVE-2023-26103
The impact of this vulnerability is concerning as it could potentially lead to a denial of service situation by an attacker manipulating the Connection/Upgrade header to disrupt the functionality of a web socket server.
Technical Details of CVE-2023-26103
In this section, we will dissect the technical aspects of CVE-2023-26103.
Vulnerability Description
The vulnerability arises due to regexes in the upgradeWebSocket function, specifically in the form of /s*,s*/ used for splitting the Connection/Upgrade header, which can be abused to cause a ReDoS scenario.
Affected Systems and Versions
The affected product is 'deno' with versions less than 1.31.0 being vulnerable to this ReDoS issue.
Exploitation Mechanism
An attacker can exploit this vulnerability by crafting a malicious Connection/Upgrade header to exploit the regexes in the upgradeWebSocket function, causing a slowdown in the web socket server's performance.
Mitigation and Prevention
Understanding the mitigation strategies and preventive measures against CVE-2023-26103 is crucial to safeguard systems from potential exploitation.
Immediate Steps to Take
To mitigate the risk associated with CVE-2023-26103, it is recommended to update deno to version 1.31.0 or higher, where the vulnerability has been addressed.
Long-Term Security Practices
Implementing strict input validation and security controls for web socket server connections can help prevent similar ReDoS vulnerabilities in the future.
Patching and Updates
Staying vigilant with software updates and patches is essential to stay protected against evolving security threats. Ensure timely updates to mitigate vulnerabilities like CVE-2023-26103.