PT-2020-4936 · Synology+1 · Synology Router Manager+1

Published 2020-10-29 · Updated 2020-11-09 · CVE-2020-27649

Positive Technologies (AI Summary)

CVSS v3.1

9.0

Critical

Base vector

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Synology Router Manager (SRM) versions prior to 1.2.4-8081

Description: The issue is related to errors in the certificate authentication procedure of the OpenVPN client in Synology Router Manager (SRM). This can be exploited by a remote attacker to gain unauthorized access to the target device by sending specially crafted requests. The vulnerability allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Recommendations: For versions prior to 1.2.4-8081, update to version 1.2.4-8081 or later to resolve the issue. As a temporary workaround, consider restricting access to the OpenVPN client until a patch is applied. Avoid using the OpenVPN client for sensitive information transmission until the issue is resolved.

Exploit

Fix

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

BDU:2020-05511

CVE-2020-27649

Affected Products

Openvpn

Synology Router Manager

References · 7

• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2020-1058 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2020-27649 · Security Note
• https://osv.dev/vulnerability/CVE-2020-27649 · Vendor Advisory
• https://synology.com/security/advisory/Synology_SA_20_14 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-05511 · Security Note
• https://t.me/cybersecuritytechnologies/2005 · Telegram Post
• https://t.me/cvenotify/5388 · Telegram Post