CVE-2018-20303 : Security Advisory and Response

A vulnerability exists in the file-upload feature of Gogs version 0.11.82.1218 and earlier, specifically in the pkg/tool/path.go file, allowing an attacker to perform directory traversal and create a file within the server's data/sessions directory.

Understanding CVE-2018-20303

This CVE was published on December 20, 2018.

What is CVE-2018-20303?

CVE-2018-20303 is a vulnerability in Gogs that enables an attacker to manipulate the file-upload functionality to create files on the server.

The Impact of CVE-2018-20303

The vulnerability allows unauthorized users to perform directory traversal and create files within the server's directory, potentially leading to unauthorized access and data manipulation.

Technical Details of CVE-2018-20303

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue lies in the file-upload feature of Gogs before version 0.11.82.1218, enabling attackers to create files under data/sessions on the server.

Affected Systems and Versions

Affected Version: Gogs version 0.11.82.1218 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the file-upload functionality to traverse directories and create files on the server.

Mitigation and Prevention

Protecting systems from CVE-2018-20303 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Gogs to a patched version that addresses the vulnerability
Monitor file-upload activities for suspicious behavior

Long-Term Security Practices

Implement access controls to restrict file-upload permissions
Regularly audit and review file-upload functionalities for security gaps

Patching and Updates

Apply patches provided by Gogs to fix the vulnerability and enhance system security