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CVE-2021-21434 : Exploit Details and Defense Strategies

Learn about CVE-2021-21434, an XSS vulnerability in OTRS AG Survey module impacting versions 6.0.x and 7.0.x. Explore impact, technical details, and mitigation steps.

A detailed overview of CVE-2021-21434, focusing on XSS vulnerability in the Survey module of OTRS AG.

Understanding CVE-2021-21434

This section provides insights into the impact, technical details, and mitigation of the XSS vulnerability in the Survey module.

What is CVE-2021-21434?

The CVE-2021-21434 targets the Survey module of OTRS AG, allowing a survey administrator to execute malicious code in the agent interface via crafted surveys.

The Impact of CVE-2021-21434

The vulnerability affects OTRS AG Survey versions 6.0.x (<=6.0.20) and 7.0.x (<=7.0.19). It possesses a CVSS base score of 3.5, indicating a low severity threat.

Technical Details of CVE-2021-21434

This section delves into the vulnerability description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The XSS flaw enables a threat actor to inject and execute malicious scripts through specially crafted surveys in the Survey module.

Affected Systems and Versions

OTRS AG Survey versions 6.0.x (<=6.0.20) and 7.0.x (<=7.0.19) are impacted by this security issue.

Exploitation Mechanism

The vulnerability allows a survey administrator to embed malicious code within surveys, leading to code execution in the agent's interface.

Mitigation and Prevention

This section outlines immediate steps, secure practices, and the necessary updates to mitigate the risks associated with CVE-2021-21434.

Immediate Steps to Take

Users are advised to upgrade to Survey 7.0.20 to address the vulnerability and prevent exploitation.

Long-Term Security Practices

Implement strict input validation, conduct security training, and regularly monitor and update the Survey module to enhance overall security.

Patching and Updates

Regularly check for security advisories from OTRS AG and apply patches promptly to mitigate any emerging vulnerabilities.

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