CVE-2020-27659 : Exploit Details and Defense Strategies

Synology Safe Access before 1.2.3-0234 is affected by multiple cross-site scripting (XSS) vulnerabilities, allowing remote attackers to inject arbitrary web script or HTML. The CVSS base score is 8.4, indicating a high severity issue.

Understanding CVE-2020-27659

This CVE involves multiple XSS vulnerabilities in Synology Safe Access, impacting versions prior to 1.2.3-0234.

What is CVE-2020-27659?

CVE-2020-27659 refers to the presence of multiple XSS vulnerabilities in Synology Safe Access before version 1.2.3-0234. These vulnerabilities enable malicious actors to inject arbitrary web script or HTML through specific parameters.

The Impact of CVE-2020-27659

The vulnerabilities have a high impact on confidentiality, integrity, and availability. Attackers can exploit these flaws remotely, necessitating user interaction for successful exploitation.

Technical Details of CVE-2020-27659

Synology Safe Access is susceptible to multiple XSS vulnerabilities, as detailed below:

Vulnerability Description

The vulnerabilities in Synology Safe Access allow remote attackers to inject arbitrary web script or HTML via the domain or profile parameter.

Affected Systems and Versions

Product: Safe Access
Vendor: Synology
Versions Affected: < 1.2.3-0234 (unspecified/custom version)

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: High
User Interaction: Required
Scope: Changed

Mitigation and Prevention

To address CVE-2020-27659, follow these mitigation strategies:

Immediate Steps to Take

Update Synology Safe Access to version 1.2.3-0234 or later.
Implement strict input validation mechanisms to prevent XSS attacks.

Long-Term Security Practices

Regularly monitor and audit web applications for vulnerabilities.
Educate users on safe browsing practices to mitigate XSS risks.

Patching and Updates

Apply security patches promptly to safeguard against known vulnerabilities in Synology Safe Access.