Fortinet on Monday issued an emergency patch to cover a severe vulnerability in its FortiOS SSL-VPN product, warning that hackers have already exploited the flaw in the wild.
A critical-level advisory from Fortinet described the bug as a memory corruption that allows a “remote unauthenticated attacker” to launch harmful code or execute commands on a target system.
“A heap-based buffer overflow vulnerability [CWE-122] in FortiOS SSL-VPN may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests,” the company warned.
Underscoring the urgency, Fortinet warned that the vulnerability has already been exploited in the wild.
“Fortinet is aware of an instance where this vulnerability was exploited in the wild, and recommends immediately validating your systems against the following indicators of compromise,” the company said, listing artifacts and connections to suspicious IP addresses that can help defenders hunt for infections.
[ Read: Fortinet Confirms Zero-Day Exploited in One Attack ]
An advisory from Fortinet’s PSIRT (product security incident response team) said the flaw carries a CVSS severity score of 9.3/10. The issue is being tracked as CVE-2022-42475.
The latest FortiOS zero-day comes on the heels of documented nation-state level APT attacks hitting security products sold by the Silicon Valley-based Fortinet.
Last month, the company privately informed some customers about zero-day attacks and the availability of patches and workarounds for an authentication bypass vulnerability that exposed FortiOS and FortiProxy products to remote attacks.
Last April, a joint CISA/FBI advisory called attention to a trio of FortiOS VPN flaws that were being exploited by high-end threat actors. FortiOS products have also featured prominently on the CISA “must-patch” Known Exploited Vulnerabilities list.
Related: Fortinet Confirms Zero-Day Vulnerability Exploited in One Attack
Related: CISA Expands ‘Must-Patch’ List With Exploited Log4j, FortiOS Flaws
Related: FBI, CISO Issue Joint Warning for Attacks Targeting Fortinet FortiOS
Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. He is a security community engagement expert who has built programs at major global brands, including Intel Corp., Bishop Fox and GReAT. Ryan is a founding-director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world.
More from Ryan Naraine
- Tenable Launches $25 Million Early-Stage Venture Fund
- VMware Plugs Critical Code Execution Flaws
- GoTo Says Hackers Stole Encrypted Backups, MFA Settings
- Apple Patches WebKit Code Execution in iPhones, MacBooks
- Thoma Bravo to Buy Magnet Forensics in $1.3B Transaction
- T-Mobile Says Hackers Used API to Steal Data on 37 Million Accounts
- Chainguard Trains Spotlight on SBOM Quality Problem
- Exploited Control Web Panel Flaw Added to CISA ‘Must-Patch’ List
Latest News
- Russian Millionaire on Trial in Hack, Insider Trade Scheme
- British Retailer JD Sports Discloses Data Breach Affecting 10 Million Customers
- Vulnerabilities in OpenEMR Healthcare Software Expose Patient Data
- Russia-Linked APT29 Uses New Malware in Embassy Attacks
- Meta Awards $27,000 Bounty for 2FA Bypass Vulnerability
- The Effect of Cybersecurity Layoffs on Cybersecurity Recruitment
- Critical Vulnerability Impacts Over 120 Lexmark Printers
- BIND Updates Patch High-Severity, Remotely Exploitable DoS Flaws
