Fortinac - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/tags/fortinac/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioWed, 03 Jan 2024 10:00:00 +0000Fortinet FortiNAC CVE-2022-39952 Exploitation Attempthttps://feed.craftedsignal.io/briefs/2024-01-fortinet-fortinac-cve-2022-39952/Wed, 03 Jan 2024 10:00:00 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2024-01-fortinet-fortinac-cve-2022-39952/An attacker attempts to exploit the Fortinet FortiNAC CVE-2022-39952 vulnerability by sending a malicious HTTP POST request to upload a payload, potentially leading to remote code execution.CVE-2022-39952 is a critical vulnerability affecting Fortinet FortiNAC, allowing for remote code execution. Exploitation involves sending a specially crafted HTTP POST request to the /configWizard/keyUpload.jsp endpoint. This vulnerability allows an unauthenticated attacker to upload arbitrary files, leading to code execution on the underlying system. Successful exploitation grants the attacker a foothold in the network, enabling further malicious activities. Public proof-of-concept exploits are readily available, making this a high-risk vulnerability for organizations using FortiNAC. The vulnerability was actively exploited following its disclosure. This activity can also be related to the Hellcat Ransomware.

Attack Chain

  1. The attacker identifies a vulnerable FortiNAC instance exposed to the internet.
  2. The attacker crafts a malicious HTTP POST request targeting the /configWizard/keyUpload.jsp endpoint.
  3. The POST request includes a payload.zip file containing a malicious payload, such as a JSP webshell.
  4. The FortiNAC server processes the request without proper validation, allowing the malicious file to be uploaded to a writeable directory.
  5. The attacker then accesses the uploaded JSP webshell via a web browser by requesting the file path.
  6. The webshell executes arbitrary commands on the FortiNAC server, granting the attacker remote code execution.
  7. The attacker leverages the gained access to schedule malicious tasks and establish persistence.
  8. The attacker establishes a command and control (C2) channel to maintain control and exfiltrate sensitive data or deploy ransomware.

Impact

Successful exploitation of CVE-2022-39952 can lead to complete compromise of the FortiNAC system. An attacker can gain unauthorized access to sensitive network configurations, user credentials, and other critical data. This can result in significant data breaches, service disruptions, and potential financial losses. The affected sectors are broad, encompassing any organization using Fortinet FortiNAC. If the attacker deploys ransomware, the organization will face data encryption, extortion demands, and potential reputational damage.

Recommendation

  • Deploy the Sigma rule Detect Fortinet FortiNAC CVE-2022-39952 Exploitation Attempt to identify exploitation attempts based on the URI and HTTP method.
  • Inspect web server logs for HTTP POST requests to /configWizard/keyUpload.jsp to identify potential exploitation attempts.
  • Monitor network traffic for connections to newly created files in web directories which could indicate successful exploitation.
  • Apply the latest Fortinet patches to remediate CVE-2022-39952 on all FortiNAC appliances immediately.
  • Enable Web Application Firewall (WAF) rules to filter out malicious requests targeting /configWizard/keyUpload.jsp.
  • Review and restrict access to the FortiNAC management interface to only authorized personnel and networks.
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