(Pwn2Own) PTC KEPServerEX Variant Resource Exhaustion Denial-of-Service Vulnerability

July 31st, 2023
ZDI-23-1011 ZDI-CAN-20500

CVE ID

CVE-2023-3825

CVSS Score

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

Affected Vendors

PTC

Affected Products

KEPServerEX

Vulnerability Details

This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of PTC KEPServerEX. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of variant types. By sending a crafted request, an attacker can consume all available resources on the server. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Additional Details

PTC has issued an update to correct this vulnerability. More details can be found at:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-208-02

Disclosure Timeline

  • 2023-02-22 - Vulnerability reported to vendor
  • 2023-07-31 - Coordinated public release of advisory

Credit

Claroty Research - Team82 - Uri Katz, Noam Moshe, Vera Mens, Sharon Brizinov

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