CVE-2018-3780 : What You Need to Know

A stored cross-site scripting (XSS) vulnerability in NextCloud Server <13.0.5 allows authenticated users to manipulate search results, potentially leading to malicious content creation.

Understanding CVE-2018-3780

This CVE involves a security issue in NextCloud Server versions prior to 13.0.5, where a lack of proper sanitization in the autocomplete field can result in a stored XSS vulnerability.

What is CVE-2018-3780?

The vulnerability arises from inadequate sanitization of search results in an autocomplete field within NextCloud Server <13.0.5, enabling authenticated users to exploit it for XSS attacks.

The Impact of CVE-2018-3780

The stored XSS vulnerability allows authenticated users to manipulate search results, potentially leading to the creation of harmful content within the NextCloud Server environment.

Technical Details of CVE-2018-3780

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The absence of proper sanitization in the autocomplete field of NextCloud Server <13.0.5 allows authenticated users to conduct stored XSS attacks by manipulating search results.

Affected Systems and Versions

Product: nextcloud/server
Vendor: NextCloud
Versions Affected: >13.0.5

Exploitation Mechanism

Attackers can exploit the vulnerability by crafting malicious search results in the autocomplete field, specifically affecting user names.

Mitigation and Prevention

Protecting systems from CVE-2018-3780 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade NextCloud Server to version 13.0.5 or higher to mitigate the vulnerability.
Educate users on safe browsing practices to prevent XSS attacks.

Long-Term Security Practices

Implement regular security audits and code reviews to identify and address vulnerabilities promptly.
Utilize web application firewalls to filter and monitor incoming traffic for malicious payloads.

Patching and Updates

Stay informed about security advisories from NextCloud and apply patches promptly to secure the environment.