Fortinet FortiAnalyzer before 5.0.12 and 5.2.x before 5.2.5; FortiSwitch 3.3.x before 3.3.3; FortiCache 3.0.x before 3.0.8; and FortiOS 4.1.x before 4.1.11, 4.2.x before 4.2.16, 4.3.x before 4.3.17 and 5.0.x before 5.0.8 have a hardcoded passphrase for the Fortimanager_Access account, which allows remote attackers to obtain administrative access via an SSH session.

References

• https://nvd.nist.gov/vuln/detail/CVE-2016-1909
• https://twitter.com/esizkur/status/686842135501508608
• https://www.exploit-db.com/exploits/39224/
• http://blog.fortinet.com/post/brief-statement-regarding-issues-found-with-fortios
• http://packetstormsecurity.com/files/135225/FortiGate-OS-5.0.7-SSH-Backdoor.html
• http://seclists.org/fulldisclosure/2016/Jan/26
• http://www.fortiguard.com/advisory/multiple-products-ssh-undocumented-login-vulnerability
• http://www.securitytracker.com/id/1034663