CVE-2020-27651 Explained : Impact and Mitigation

Synology Router Manager (SRM) before 1.2.4-8081 is vulnerable to session cookie interception in HTTPS sessions.

Understanding CVE-2020-27651

This CVE involves a security vulnerability in Synology Router Manager (SRM) that allows for the interception of session cookies in HTTPS sessions.

What is CVE-2020-27651?

CVE-2020-27651 is a vulnerability in Synology Router Manager (SRM) versions prior to 1.2.4-8081, where the Secure flag for the session cookie is not set in HTTPS sessions, making it easier for attackers to capture the cookie.

The Impact of CVE-2020-27651

The vulnerability poses a medium severity risk, with a CVSS base score of 5.8. Attackers can exploit this issue to intercept session cookies, potentially compromising user sessions and sensitive information.

Technical Details of CVE-2020-27651

This section provides more in-depth technical details about the CVE.

Vulnerability Description

Synology Router Manager (SRM) before version 1.2.4-8081 fails to set the Secure flag for the session cookie in HTTPS sessions, enabling attackers to capture the cookie via interception in HTTP sessions.

Affected Systems and Versions

Product: Synology Router Manager (SRM)
Vendor: Synology
Versions Affected: < 1.2.4-8081 (unspecified/custom version)

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality Impact: Low
Integrity Impact: Low
Availability Impact: Low

Mitigation and Prevention

Protecting systems from CVE-2020-27651 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Synology Router Manager (SRM) to version 1.2.4-8081 or newer.
Monitor network traffic for any suspicious activities.
Consider using additional encryption methods for sensitive data transmission.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Implement HTTPS across all network communications.
Educate users on secure browsing practices and cookie management.

Patching and Updates

Apply the latest security patches provided by Synology for SRM.
Stay informed about security advisories and updates from Synology.