// For flags

CVE-2024-33897

Ewon Cosy+ / Talk2M Remote Access Solution Improper Authentication

Severity Score

9.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

A compromised HMS Networks Cosy+ device could be used to request a Certificate Signing Request from Talk2m for another device, resulting in an availability issue. The issue was patched on the Talk2m production server on April 18, 2024.

During account assignment in the Talk2M platform, a Cosy+ device generates and sends a certificate signing request (CSR) to the back end. This CSR is then signed by the manufacturer and used for OpenVPN authentication by the device afterward. Since the common name (CN) of the certificate is specified by the device and used in order to assign the OpenVPN session to the corresponding Talk2M account, an attacker with root access to a Cosy+ device is able to manipulate the CSR and get correctly signed certificates for foreign devices.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-04-28 CVE Reserved
  • 2024-08-06 CVE Published
  • 2024-08-13 EPSS Updated
  • 2024-08-19 First Exploit
  • 2024-08-22 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-425: Direct Request ('Forced Browsing')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Hms-networks
Search vendor "Hms-networks"
 Ewon Cosy+ Firmware
Search vendor "Hms-networks" for product "Ewon Cosy+ Firmware"
*-
Affected
Hms-networks
Search vendor "Hms-networks"
 Ewon Cosy Firmware
Search vendor "Hms-networks" for product "Ewon Cosy Firmware"
*-
Affected