CVE-2017-0890 : What You Need to Know

Nextcloud Server before version 11.0.3 is vulnerable to an XSS exploit due to inadequate escaping in the search module.

Understanding CVE-2017-0890

This CVE involves a Cross-Site Scripting (XSS) vulnerability in Nextcloud Server versions prior to 11.0.3.

What is CVE-2017-0890?

The search module of Nextcloud Server versions before 11.0.3 has a vulnerability related to inadequate escaping, potentially leading to XSS attacks. Exploiting this vulnerability requires a user to input or insert malicious content into the search dialogue.

The Impact of CVE-2017-0890

Allows attackers to execute malicious scripts in the context of an unsuspecting user's session
Can lead to unauthorized actions or data theft

Technical Details of CVE-2017-0890

Nextcloud Server before version 11.0.3 is susceptible to an XSS vulnerability in the search module.

Vulnerability Description

The vulnerability arises from inadequate escaping in the search module, enabling attackers to inject malicious scripts.

Affected Systems and Versions

Product: Nextcloud Server
Vendor: Nextcloud
Versions Affected: Before 11.0.3

Exploitation Mechanism

To exploit this vulnerability, a user must input or insert malicious content into the search dialogue.

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2017-0890

Immediate Steps to Take

Update Nextcloud Server to version 11.0.3 or later to mitigate the vulnerability
Educate users about the risks of inputting untrusted content

Long-Term Security Practices

Regularly monitor and update web application security measures
Implement input validation and output encoding to prevent XSS attacks

Patching and Updates

Apply security patches promptly to address known vulnerabilities