China State Hackers Infected 20,000 Fortinet VPNs, Dutch Spy Service Says

An anonymous reader quotes a report from Ars Technica: Hackers working for the Chinese government gained access to more than 20,000 VPN appliances sold by Fortinet using a critical vulnerability that the company failed to disclose for two weeks after fixing it, Netherlands government officials said. The vulnerability, tracked as CVE-2022-42475, is a heap-based buffer overflow that allows hackers to remotely execute malicious code. It carries a severity rating of 9.8 out of 10. A maker of network security software, Fortinet silently fixed the vulnerability on November 28, 2022, but failed to mention the threat until December 12 of that year, when the company said it became aware of an "instance where this vulnerability was exploited in the wild." On January 11, 2023 -- more than six weeks after the vulnerability was fixed -- Fortinet warned a threat actor was exploiting it to infect government and government-related organizations with advanced custom-made malware. Netherlands government officials wrote in Monday's report: Since the publication in February, the MIVD has continued to investigate the broader Chinese cyber espionage campaign. This revealed that the state actor gained access to at least 20,000 FortiGate systems worldwide within a few months in both 2022 and 2023 through the vulnerability with the identifier CVE-2022-42475 . Furthermore, research shows that the state actor behind this campaign was already aware of this vulnerability in FortiGate systems at least two months before Fortinet announced the vulnerability. During this so-called 'zero-day' period, the actor alone infected 14,000 devices. Targets include dozens of (Western) governments, international organizations and a large number of companies within the defense industry. The state actor installed malware at relevant targets at a later date. This gave the state actor permanent access to the systems. Even if a victim installs security updates from FortiGate, the state actor continues to have this access. It is not known how many victims actually have malware installed. The Dutch intelligence services and the NCSC consider it likely that the state actor could potentially expand its access to hundreds of victims worldwide and carry out additional actions such as stealing data. Even with the technical report on the COATHANGER malware, infections from the actor are difficult to identify and remove. The NCSC and the Dutch intelligence services therefore state that it is likely that the state actor still has access to systems of a significant number of victims.

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