CVE-2023-26047 : Vulnerability Insights and Analysis

This CVE record pertains to teler-waf, a Go HTTP middleware providing teler IDS functionality to guard against web-based attacks. The vulnerability in teler-waf prior to version v0.2.0 allows a bypass attack through a specific case-sensitive hex entities payload containing special characters like CR/LF and horizontal tab. This flaw enables an attacker to execute arbitrary JavaScript code on the victim's browser, potentially compromising the web application's security.

Understanding CVE-2023-26047

This section delves into the details of the CVE-2023-26047 vulnerability.

What is CVE-2023-26047?

CVE-2023-26047 concerns a security vulnerability in teler-waf wherein an attacker can exploit a bypass attack to execute arbitrary JavaScript code on the victim's browser.

The Impact of CVE-2023-26047

The impact of CVE-2023-26047 is substantial as it allows threat actors to bypass standard web attack threat rules in teler-waf. This can lead to the execution of cross-site scripting (XSS) attacks, potentially compromising sensitive information and user privacy.

Technical Details of CVE-2023-26047

In this section, we delve deeper into the technical aspects of the CVE-2023-26047 vulnerability.

Vulnerability Description

The vulnerability in teler-waf prior to version v0.2.0 enables attackers to bypass security mechanisms, execute arbitrary JavaScript code, and potentially launch XSS attacks on victim browsers.

Affected Systems and Versions

The affected system is teler-waf versions prior to v0.2.0, specifically those below version 0.2.0.

Exploitation Mechanism

Attackers can exploit the vulnerability by crafting a specific case-sensitive hex entities payload with special characters, allowing them to execute arbitrary JavaScript code on victim browsers.

Mitigation and Prevention

This section outlines steps to mitigate and prevent exploitation of CVE-2023-26047.

Immediate Steps to Take

Users of teler-waf should immediately update to version v0.2.0 or later to patch the vulnerability and protect against bypass attacks.

Long-Term Security Practices

Implementing strict input validation, output encoding, and other web security best practices can enhance the overall security of web applications.

Patching and Updates

Regularly monitoring for security updates and promptly applying patches is crucial to safeguarding systems against known vulnerabilities like CVE-2023-26047.