CVE-2020-27649: Vulnerability Analysis & Exploit Details

Status: Analyzed - Last modified: 09-11-2020 Published: 29-10-2020

CVE-2020-27649
Vulnerability Scoring

9.0
/10

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

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

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