Advisory Details

June 21st, 2024

(Pwn2Own) Phoenix Contact CHARX SEC-3100 Improper Access Control Firewall Bypass Vulnerability

ZDI-24-857
ZDI-CAN-23221

CVE ID CVE-2024-25996
CVSS SCORE 5.0, AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
AFFECTED VENDORS Phoenix Contact
AFFECTED PRODUCTS CHARX SEC-3100
VULNERABILITY DETAILS

This vulnerability allows network-adjacent attackers to bypass firewall rules and access another interface on affected installations of Phoenix Contact CHARX SEC-3100 devices. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the configuration of firewall rules. The issue results from the use of rules that filter inbound traffic on the basis of the source port. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root.

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 Tobias Scharnowski (@ScepticCTF), Felix Buchmann
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