CVE-2017-5480 : What You Need to Know

A directory traversal vulnerability in b2evolution up to version 6.8.3 allows remote authenticated users to access unauthorized files by exploiting back-office access.

Understanding CVE-2017-5480

This CVE involves a security flaw in b2evolution that enables authenticated remote attackers to read or delete files they are not authorized to access.

What is CVE-2017-5480?

The vulnerability in the inc/files/files.ctrl.php file of b2evolution up to version 6.8.3 permits attackers to bypass file restrictions and gain unauthorized access to files by inserting ".." in the fm_selected array parameter.

The Impact of CVE-2017-5480

The vulnerability allows remote authenticated users to read or delete files they are not authorized to access, potentially leading to unauthorized data exposure or loss.

Technical Details of CVE-2017-5480

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw in b2evolution through version 6.8.3 enables remote authenticated users to perform directory traversal attacks, compromising file security.

Affected Systems and Versions

Product: b2evolution
Versions affected: Up to 6.8.3

Exploitation Mechanism

Attackers exploit the vulnerability by inserting ".." in the fm_selected array parameter, leveraging their back-office access to gain unauthorized file access.

Mitigation and Prevention

Protecting systems from CVE-2017-5480 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update b2evolution to the latest version to patch the vulnerability.
Monitor file access and restrict unnecessary privileges to prevent unauthorized file manipulation.

Long-Term Security Practices

Regularly audit and review file permissions to ensure proper access controls.
Educate users on secure file handling practices to prevent inadvertent data exposure.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.