CVE-2020-10103 : Security Advisory and Response

An XSS issue in Zammad 3.0 through 3.2 allows low-privileged users to execute malicious JavaScript via the File Upload feature.

Understanding CVE-2020-10103

This CVE involves a cross-site scripting vulnerability in Zammad versions 3.0 through 3.2, enabling the execution of harmful code by unauthorized users.

What is CVE-2020-10103?

Zammad 3.0 through 3.2 is susceptible to an XSS flaw that permits low-privileged users to inject malicious JavaScript through the File Upload functionality.

The Impact of CVE-2020-10103

The vulnerability allows attackers to execute malicious code within the browsers of users who access specially crafted links to uploaded files while logged into Zammad.

Technical Details of CVE-2020-10103

This section provides a detailed overview of the technical aspects of the CVE.

Vulnerability Description

The XSS vulnerability in Zammad 3.0 through 3.2 enables low-privileged users to insert and execute malicious JavaScript code via the File Upload feature.

Affected Systems and Versions

Product: Zammad
Vendor: N/A
Versions: 3.0 through 3.2

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading files containing malicious JavaScript code and then tricking users with active Zammad sessions into clicking specially crafted links to these files.

Mitigation and Prevention

Protecting systems from CVE-2020-10103 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable the File Upload feature in Zammad until a patch is available.
Educate users about the risks of clicking on unverified links.

Long-Term Security Practices

Regularly update Zammad to the latest version to apply security patches.
Implement content security policies to mitigate XSS attacks.

Patching and Updates

Ensure that Zammad is updated to a version that includes a fix for the XSS vulnerability to prevent exploitation.