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medium threat

Fortinet FortiAnalyzer and FortiManager Vulnerability Allows Denial of Service

A remote, authenticated attacker can exploit a vulnerability in Fortinet FortiAnalyzer and FortiManager to perform a denial-of-service attack, disrupting normal operations.

A vulnerability exists in Fortinet FortiAnalyzer and FortiManager that could allow a remote, authenticated attacker to trigger a denial-of-service (DoS) condition. While the specifics of the vulnerability are not detailed in the provided source, the impact is significant, as a successful attack could disrupt normal operations and potentially lead to service unavailability. Defenders should prioritize patching and consider monitoring for unusual activity on FortiAnalyzer and FortiManager devices.

Attack Chain

  1. The attacker gains valid credentials for FortiAnalyzer or FortiManager.
  2. The attacker authenticates to the FortiAnalyzer or FortiManager web interface or API.
  3. The attacker sends a crafted request to a specific endpoint or function.
  4. The vulnerable component processes the malicious request.
  5. The processing of the request consumes excessive resources (CPU, memory, I/O).
  6. The device becomes unresponsive or slow to respond to legitimate requests.
  7. Legitimate users are unable to access or manage the Fortinet devices.
  8. A denial-of-service condition occurs, impacting network monitoring, logging, and security management capabilities.

Impact

A successful denial-of-service attack against FortiAnalyzer and FortiManager can severely impact an organization’s security posture. These tools are critical for log analysis, security event monitoring, and device management. Disruption of these services can lead to delayed incident response, missed security alerts, and increased risk of successful attacks. The number of affected organizations would depend on the prevalence of FortiAnalyzer and FortiManager deployments within the target sector.

Recommendation

  • Apply the latest Fortinet security patches for FortiAnalyzer and FortiManager as soon as possible to remediate the underlying vulnerability.
  • Monitor authentication logs for FortiAnalyzer and FortiManager for unusual login activity (see rule “Detect Fortinet Login Anomalies”).
  • Implement rate limiting on the FortiAnalyzer and FortiManager web interface and API to mitigate potential DoS attacks.
  • Monitor system resource utilization (CPU, memory, I/O) on FortiAnalyzer and FortiManager devices for unusual spikes that could indicate a DoS attack (see rule “Detect Fortinet Resource Exhaustion”).

Detection coverage 2

Detect Fortinet Login Anomalies

low

Detects unusual login activity to Fortinet devices, which could be an early sign of an attack.

sigma tactics: initial_access techniques: T1078 sources: authentication, fortinet

Detect Fortinet Resource Exhaustion

medium

Detects high CPU or memory usage on Fortinet devices, potentially indicating a denial-of-service attack.

sigma tactics: availability techniques: T1499 sources: system, fortinet

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