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CVE-2017-0891 Explained : Impact and Mitigation

Critical XSS vulnerability in Nextcloud Server versions before 9.0.58, 10.0.5, and 11.0.3. Learn about the impact, affected systems, exploitation, and mitigation steps.

Nextcloud Server versions prior to 9.0.58, 10.0.5, and 11.0.3 are vulnerable to XSS due to insufficient escaping of error messages.

Understanding CVE-2017-0891

There are critical security vulnerabilities in Nextcloud Server versions before 9.0.58, 10.0.5, and 11.0.3 that can lead to cross-site scripting (XSS) attacks.

What is CVE-2017-0891?

This CVE identifies XSS vulnerabilities in multiple components of Nextcloud Server versions prior to 9.0.58, 10.0.5, and 11.0.3. The issue arises from inadequate escaping of error messages.

The Impact of CVE-2017-0891

The vulnerability allows attackers to inject malicious scripts into web pages viewed by users, potentially leading to unauthorized access, data theft, and other malicious activities.

Technical Details of CVE-2017-0891

Nextcloud Server versions before 9.0.58, 10.0.5, and 11.0.3 are affected by this CVE.

Vulnerability Description

The XSS vulnerability stems from the lack of proper escaping of error messages within the affected versions of Nextcloud Server.

Affected Systems and Versions

        Product: Nextcloud Server
        Vendor: Nextcloud
        Vulnerable Versions: before 9.0.58, 10.0.5, and 11.0.3

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts into error messages, which are then executed when viewed by users, leading to XSS attacks.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2017-0891.

Immediate Steps to Take

        Update Nextcloud Server to versions 9.0.58, 10.0.5, or 11.0.3 or later to patch the XSS vulnerability.
        Regularly monitor and audit web applications for any signs of XSS vulnerabilities.

Long-Term Security Practices

        Implement secure coding practices to prevent XSS vulnerabilities in web applications.
        Educate developers and users about the risks of XSS attacks and how to prevent them.

Patching and Updates

        Stay informed about security advisories from Nextcloud and apply patches promptly to address known vulnerabilities.

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