CVE-2021-35489 : Exploit Details and Defense Strategies

Thruk 2.40-2 allows for Reflected XSS via the host or service parameter, potentially enabling an attacker to inject arbitrary JavaScript. This vulnerability could be exploited whenever an authenticated user visits a compromised page.

Understanding CVE-2021-35489

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-35489.

What is CVE-2021-35489?

CVE-2021-35489 relates to a reflected Cross-Site Scripting (XSS) vulnerability in Thruk 2.40-2, which could allow attackers to insert malicious scripts into the extinfo.cgi script.

The Impact of CVE-2021-35489

The vulnerability poses a significant risk as it enables threat actors to execute arbitrary JavaScript code, compromising the security and integrity of the affected system.

Technical Details of CVE-2021-35489

Explore the specific aspects of the vulnerability in this section to understand its nature.

Vulnerability Description

The flaw in Thruk 2.40-2 allows attackers to inject arbitrary JavaScript code via the host or service parameter, leading to reflected XSS attacks.

Affected Systems and Versions

Thruk 2.40-2 is confirmed to be impacted by this vulnerability, potentially affecting all instances running this specific version.

Exploitation Mechanism

By manipulating the host or service parameter in the extinfo.cgi script, threat actors can inject malicious JavaScript payloads that trigger when authenticated users access the compromised page.

Mitigation and Prevention

Discover the steps to mitigate the risks associated with CVE-2021-35489 and safeguard systems from potential exploits.

Immediate Steps to Take

System administrators should apply security patches promptly, update Thruk to a patched version, and closely monitor web traffic for any suspicious activities.

Long-Term Security Practices

Implement robust security measures, such as input validation, output encoding, and security headers, to fortify web applications against XSS vulnerabilities.

Patching and Updates

Regularly monitor for security advisories from Thruk developers and apply updates as soon as patches are released to address known vulnerabilities.