CVE-2020-29133 : Security Advisory and Response

Coremail XT 5.0 is vulnerable to XSS through the jsp/upload.jsp page when uploading a personal signature with a malicious filename.

Understanding CVE-2020-29133

This CVE identifies a cross-site scripting (XSS) vulnerability in Coremail XT 5.0 that can be exploited through a specific parameter.

What is CVE-2020-29133?

The vulnerability in jsp/upload.jsp in Coremail XT 5.0 allows attackers to execute XSS attacks by uploading a personal signature with a crafted filename.

The Impact of CVE-2020-29133

This vulnerability could lead to unauthorized script execution in the context of the user's browser, potentially compromising sensitive data or performing actions on behalf of the user.

Technical Details of CVE-2020-29133

Coremail XT 5.0 is susceptible to XSS attacks due to improper input validation in the signImgFile parameter.

Vulnerability Description

The issue arises from the lack of proper sanitization of user-supplied input, enabling attackers to inject malicious scripts into the application.

Affected Systems and Versions

Product: Coremail XT 5.0
Vendor: Coremail
Version: All versions are affected

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading a personal signature with a filename containing malicious script code, such as a .jpg.html file.

Mitigation and Prevention

To address CVE-2020-29133, follow these mitigation strategies:

Immediate Steps to Take

Disable the affected functionality if not essential
Implement input validation and sanitization routines
Educate users about safe file uploading practices

Long-Term Security Practices

Regularly update and patch the Coremail XT software
Conduct security assessments and penetration testing

Patching and Updates

Apply patches or updates provided by Coremail to fix the XSS vulnerability