CVE-2020-1183 : Security Advisory and Response

Microsoft SharePoint Server XSS Vulnerability

Understanding CVE-2020-1183

A cross-site-scripting (XSS) vulnerability in Microsoft SharePoint Server allows attackers to execute malicious scripts on the victim's browser.

What is CVE-2020-1183?

This vulnerability occurs due to a failure to properly sanitize specific web requests to the affected SharePoint server, posing a risk of XSS attacks.

The Impact of CVE-2020-1183

Attackers can manipulate content on SharePoint sites, leading to unauthorized actions or data theft.
Successful exploitation could result in the compromise of sensitive information or the unauthorized access of user data.

Technical Details of CVE-2020-1183

Vulnerability Description

This CVE is distinct from several other identified vulnerabilities (CVE-2020-1177, CVE-2020-1297, CVE-2020-1298, CVE-2020-1318, CVE-2020-1320) and focuses specifically on the XSS issue in SharePoint Server.

Affected Systems and Versions

Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019
Microsoft SharePoint Foundation 2013 Service Pack 1

Exploitation Mechanism

The vulnerability is exploited by sending a crafted web request to the SharePoint server, tricking it into executing malicious scripts.

Mitigation and Prevention

Immediate Steps to Take

Apply the security patch provided by Microsoft to address this vulnerability.
Ensure all SharePoint servers are updated with the latest security fixes.

Long-Term Security Practices

Regularly update and maintain SharePoint servers to prevent security loopholes.
Educate users on safe browsing practices and the risks associated with XSS attacks.
Employ web application firewalls and security monitoring tools to detect and prevent malicious activities.

Patching and Updates

Regularly check for security updates and patches from Microsoft to safeguard SharePoint servers from known vulnerabilities.