15K Fortinet Device Configs Leaked to the Dark Web

Dated configuration data and virtual private network (VPN) credentials for 15,474 Fortinet devices have been posted for free to the Dark Web. On Jan. 14, Fortinet disclosed a severe authentication bypass vulnerability in its FortiOS operating system and FortiProxy Web gateway, CVE-2024-55591. For a model of what the aftermath of such a vulnerability could look like, one need only look to a parallel bug from October 2022 that's still making waves today. Back then, Fortinet published an urgent security warning regarding CVE-2022-40684, an equivalent authentication bypass vulnerability affecting FortiOS, FortiProxy, and the autological FortiSwitchManager. Earning a "critical" 9.8 rating in the Common Vulnerability Scoring System (CVSS), it allowed any unauthenticated attacker to perform administrative operations on vulnerable devices via specially crafted HTTP requests. In the wake of that disclosure, security researchers developed a proof-of-concept (PoC) exploit, a template for scanning for vulnerable devices, and watched as exploitation attempts climbed and climbed. On the same day CVE-2024-55591 was disclosed this week, a threat actor with the nom de guerre "Belsen Group" released data belonging to more than 15,000 Fortinet devices. In a blog post, the CloudSEK researchers who spotted it assessed that the data had been stolen thanks to CVE-2022-40684, likely when that bug was still a zero-day. Now, they wrote, "Once they exhausted its use for themselves (either by selling or...