CVE-2021-35488 : Security Advisory and Response

Thruk version 2.40-2 is vulnerable to a reflected XSS attack through the host or title parameter in /thruk/#cgi-bin/status.cgi. This vulnerability allows an attacker to inject malicious JavaScript code into the status.cgi page, which will execute whenever an authenticated user accesses the infected page.

Understanding CVE-2021-35488

Thruk version 2.40-2 contains a security flaw that enables attackers to execute arbitrary scripts through specific parameters, leading to potential XSS attacks.

What is CVE-2021-35488?

CVE-2021-35488 refers to a reflected cross-site scripting vulnerability in Thruk 2.40-2, allowing unauthorized code execution via status.cgi parameters.

The Impact of CVE-2021-35488

The exploit permits threat actors to insert and trigger JavaScript code in status.cgi, compromising the integrity of the accessed page and potentially compromising user data.

Technical Details of CVE-2021-35488

Thruk 2.40-2 is susceptible to injection attacks via crafted requests to status.cgi, enabling malicious JavaScript payloads to operate in the context of authenticated users.

Vulnerability Description

The flaw in Thruk 2.40-2 allows threat actors to embed arbitrary JavaScript within status.cgi, executing it upon user interactions on the infected page.

Affected Systems and Versions

Thruk version 2.40-2 is confirmed to be impacted by this vulnerability, potentially affecting systems using this specific release.

Exploitation Mechanism

By tampering with the host or title parameters in /thruk/#cgi-bin/status.cgi, attackers can execute unauthorized JavaScript on the status page, posing a serious security risk.

Mitigation and Prevention

Taking immediate actions to address and prevent CVE-2021-35488 is crucial to safeguard systems and user data.

Immediate Steps to Take

Users are advised to update Thruk to a patched version post-haste, minimizing the risk of exploitation and unauthorized code execution.

Long-Term Security Practices

Implementing robust input validation mechanisms and restricting user inputs can fortify defenses against XSS attacks and similar vulnerabilities.

Patching and Updates

Regularly monitoring security advisories and promptly applying software patches can mitigate the risk of exploitation and enhance the overall security posture of the system.