(Pwn2Own) Phoenix Contact CHARX SEC-3100 Config Manager Improper Input Validation Remote Code Execution Vulnerability

June 21st, 2024
ZDI-24-856 ZDI-CAN-23158

CVE ID

CVE-2024-25995

CVSS Score

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

Affected Vendors

Phoenix Contact

Affected Products

CHARX SEC-3100

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Phoenix Contact CHARX SEC-3100 devices. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the CharxSystemConfigManager service, which listens on TCP port 5001 by default. The issue results from the lack of proper validation of a user-supplied string before using it to update a configuration. An attacker can leverage this vulnerability to execute code in the context of the service account.

Additional Details

Phoenix Contact has issued an update to correct this vulnerability. More details can be found at:
https://cert.vde.com/en/advisories/VDE-2024-011/

Disclosure Timeline

  • 2024-02-02 - Vulnerability reported to vendor
  • 2024-06-21 - Coordinated public release of advisory
  • 2024-08-15 - Advisory Updated

Credit

NCC Group EDG (@nccgroupinfosec @_mccaulay @alexjplaskett)

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