Chinese Hackers Exploit Fortinet VPN Zero-Day to Steal Credentials

Chinese threat actors, identified as BrazenBamboo, are actively exploiting a zero-day vulnerability in Fortinet’s FortiClient Windows VPN client. This flaw allows the attackers to steal VPN credentials, posing a severe risk to corporate networks worldwide. 🌍💻

The vulnerability, discovered by Volexity researchers in July 2024, enables the dumping of VPN credentials (usernames and passwords) from memory after user authentication. 🔐 Key Points:

The flaw targets sensitive JSON objects stored in memory, containing VPN credentials and gateway information.These details are exfiltrated to attackers using a custom malware plugin called DeepData.The issue remains unresolved, with no assigned CVE or patch available.

The hacking group BrazenBamboo is known for sophisticated surveillance campaigns, leveraging advanced malware to target multiple platforms, including Windows, macOS, iOS, and Android. 🔍 Key malware tools used:

LightSpy: Multi-platform spyware for keylogging, credential theft, and communication monitoring.DeepPost: Facilitates data exfiltration from compromised devices.DeepData: A modular post-exploitation tool designed for targeted data theft, including a plugin specifically for exploiting the FortiClient VPN vulnerability.

DeepData identifies and decrypts sensitive JSON objects in FortiClient’s memory, extracting: 🔑 Usernames 🔑 Passwords 🔑 VPN server details

This access enables attackers to infiltrate corporate networks, spread laterally, and escalate espionage campaigns. BrazenBamboo’s attacks are believed to focus on sensitive systems for long-term data surveillance.

Although Volexity reported the flaw to Fortinet in July 2024, the issue remains unpatched. Fortinet acknowledged the vulnerability on July 24, 2024, but has yet to provide a fix.

Restrict VPN access to authorized users only.Monitor for unusual login activity.Stay updated on Fortinet’s response and patch announcements.

This zero-day echoes past vulnerabilities in Fortinet products, highlighting the critical need for:

Better memory management to clear sensitive data post-authentication.Proactive patching policies to address emerging threats.

With VPNs being a critical component of corporate infrastructure, this exploit underscores the importance of constant vigilance in cybersecurity defenses. 🌐🔒

Follow WIRE TOR CyberSecurity for the latest updates on vulnerabilities and proactive solutions. 🚀✨

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