CVE-2017-15891 Explained : Impact and Mitigation

A vulnerability in Synology Calendar before version 2.0.1-0242 allows remote authenticated users to modify calendar events, posing a security risk.

Understanding CVE-2017-15891

This CVE involves an improper access control issue in Synology Calendar, potentially exploited by authenticated remote users.

What is CVE-2017-15891?

The vulnerability stems from improper access control in SYNO.Cal.EventBase in versions of Synology Calendar prior to 2.0.1-0242. This flaw enables authenticated remote users to manipulate calendar events through unspecified methods.

The Impact of CVE-2017-15891

The vulnerability permits remote authenticated users to make unauthorized changes to calendar events, compromising data integrity and confidentiality.

Technical Details of CVE-2017-15891

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability lies in SYNO.Cal.EventBase in Synology Calendar versions before 2.0.1-0242, allowing remote authenticated users to alter calendar events through unspecified vectors.

Affected Systems and Versions

Product: Synology Calendar
Vendor: Synology
Versions Affected: Before 2.0.1-0242

Exploitation Mechanism

The vulnerability can be exploited by remote authenticated users to manipulate calendar events, potentially leading to unauthorized modifications.

Mitigation and Prevention

Protecting systems from CVE-2017-15891 is crucial to prevent unauthorized access and data breaches.

Immediate Steps to Take

Update Synology Calendar to version 2.0.1-0242 or later to mitigate the vulnerability.
Monitor calendar events for any unauthorized changes.

Long-Term Security Practices

Implement strong authentication mechanisms to prevent unauthorized access.
Regularly review and update access control policies to enhance security.

Patching and Updates

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