CVE-2018-20240 : What You Need to Know

Atlassian Fisheye and Crucible prior to version 4.7.0 are affected by a cross-site scripting (XSS) vulnerability that allows remote attackers to inject arbitrary HTML or JavaScript.

Understanding CVE-2018-20240

This CVE involves a security issue in Atlassian Fisheye and Crucible that could lead to XSS attacks.

What is CVE-2018-20240?

The vulnerability in the administrative linker functionality of Atlassian Fisheye and Crucible before version 4.7.0 allows malicious actors to execute XSS attacks by manipulating the href parameter.

The Impact of CVE-2018-20240

This vulnerability enables remote attackers to implant arbitrary HTML or JavaScript code, potentially leading to unauthorized access, data theft, or other malicious activities.

Technical Details of CVE-2018-20240

Atlassian Fisheye and Crucible versions prior to 4.7.0 are susceptible to this XSS vulnerability.

Vulnerability Description

The flaw in the administrative linker functionality permits attackers to inject malicious code through the href parameter, posing a risk of XSS attacks.

Affected Systems and Versions

Product: Fisheye and Crucible
Vendor: Atlassian
Versions Affected: < 4.7.0

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious link containing the XSS payload in the href parameter, which, when clicked by a user with administrative privileges, executes the injected code.

Mitigation and Prevention

To address CVE-2018-20240, follow these security measures:

Immediate Steps to Take

Upgrade Atlassian Fisheye and Crucible to version 4.7.0 or later to mitigate the vulnerability.
Implement input validation mechanisms to sanitize user inputs and prevent XSS attacks.

Long-Term Security Practices

Regularly monitor security advisories from Atlassian and apply patches promptly.
Educate users on safe browsing practices and the risks associated with clicking on untrusted links.

Patching and Updates

Stay informed about security updates and patches released by Atlassian for Fisheye and Crucible.
Ensure timely installation of updates to protect systems from known vulnerabilities.