Essential Insights
- Threat actors are exploiting default and organization-specific credentials on Fortinet FortiGate devices through large-scale brute-force and credential stuffing attacks, compromising over 86,000 devices globally.
- The attack employs automated tools that scan for vulnerable internet-facing Fortinet endpoints, verify only valid credentials, and then passively monitor network traffic to harvest additional credentials for further infiltration.
- Many organizations remain vulnerable due to outdated credential storage methods (SHA-256 hashes) and poor password hygiene, enabling persistent and widespread exploitation across sectors and regions.
Threat, Attack Techniques, and Targets
The threat, called FortiBleed, is a large-scale cyber campaign involving Russian-speaking threat actors. It targets Fortinet FortiGate appliances that are accessible via the internet. The attackers have been using a mass scanning method to find these devices and then use a special tool to try common passwords against them. If they gain access, they monitor network traffic to find more credentials. These credentials are checked to ensure they are valid before being saved for further access. The campaign mostly targets sectors like telecom, government, and education. The most affected countries include India, the U.S., Mexico, Colombia, and Thailand. The hackers aim to take control of Fortinet devices by guessing or using known passwords to break into them.
Impact, Security Implications, and Remediation Guidance
This attack affects many organizations worldwide across various industries. Once inside, hackers can potentially access sensitive data or disrupt network security. The attack uses methods such as brute-force, dictionary attacks, and credential stuffing. Many devices use outdated password hashing mechanisms, which helped the hackers succeed. The incident shows that weak password policies and reuse can help attackers. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) recommends actions like stopping all active sessions, resetting passwords, and enabling multi-factor authentication. Organizations should review logs for suspicious activity and strengthen their security practices. For detailed steps to fix this issue, organizations should consult Fortinet or relevant security authorities.
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