CVE-2020-27649
Vulnerability Scoring
Attack Complexity Details
- Attack Complexity: HIGH IMPACT
- Attack Vector: NETWORK
- Privileges Required: None
- Scope: CHANGED
- User Interaction: NONE
CIA Impact Definition
- Confidentiality: HIGH IMPACT
- Integrity: HIGH IMPACT
- Availability: HIGH IMPACT
CVE-2020-27649 Vulnerability Summary
Improper certificate validation vulnerability in OpenVPN client in Synology Router Manager (SRM) before 1.2.4-8081 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
Access Complexity Graph for CVE-2020-27649
Impact Analysis for CVE-2020-27649
CVE-2020-27649: Detailed Information and External References
EPSS
0.00225
EPSS %
0.60767
References
0.00225
- https://www.synology.com/security/advisory/Synology_SA_20_14
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1058
CWE
CWE-295
CAPEC
0.00225
- Creating a Rogue Certification Authority Certificate: An adversary exploits a weakness resulting from using a hashing algorithm with weak collision resistance to generate certificate signing requests (CSR) that contain collision blocks in their "to be signed" parts. The adversary submits one CSR to be signed by a trusted certificate authority then uses the signed blob to make a second certificate appear signed by said certificate authority. Due to the hash collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the adversary's second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority.
- Signature Spoofing by Improper Validation: An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.
Vulnerable Configurations
-
cpe:2.3:a:synology:router_manager:1.2:*:*:*:*:*:*:*
cpe:2.3:a:synology:router_manager:1.2:*:*:*:*:*:*:*
-
cpe:2.3:a:synology:router_manager:1.2.1-7779:*:*:*:*:*:*:*
cpe:2.3:a:synology:router_manager:1.2.1-7779:*:*:*:*:*:*:*
-
cpe:2.3:a:synology:router_manager:1.2.1-7779-1:*:*:*:*:*:*:*
cpe:2.3:a:synology:router_manager:1.2.1-7779-1:*:*:*:*:*:*:*
-
cpe:2.3:a:synology:router_manager:1.2.2-7915:*:*:*:*:*:*:*
cpe:2.3:a:synology:router_manager:1.2.2-7915:*:*:*:*:*:*:*
-
cpe:2.3:a:synology:router_manager:1.2.3-8017-2:*:*:*:*:*:*:*
cpe:2.3:a:synology:router_manager:1.2.3-8017-2:*:*:*:*:*:*:*
-
cpe:2.3:a:synology:router_manager:1.2.3-8087:*:*:*:*:*:*:*
cpe:2.3:a:synology:router_manager:1.2.3-8087:*:*:*:*:*:*:*
CVSS3 Source
nvd@nist.gov
CVSS3 Type
Primary
CVSS3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Protect Your Infrastructure: Combat Critical CVE Threats
Stay updated with real-time CVE vulnerabilities and take action to secure your systems. Enhance your cybersecurity posture with the latest threat intelligence and mitigation techniques. Develop the skills necessary to defend against CVEs and secure critical infrastructures. Join the top cybersecurity professionals safeguarding today's infrastructures.