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Fortinet Ships Emergency Patch for Already-Exploited VPN Flaw

By Ryan Naraine on December 12, 2022

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Fortinet on Monday issued an emergency patch to cowl a extreme vulnerability in its FortiOS SSL-VPN product, warning that hackers have already exploited the flaw within the wild.

A critical-level advisory from Fortinet described the bug as a reminiscence corruption that enables a “distant unauthenticated attacker” to launch dangerous code or execute instructions on a goal system. 

“A heap-based buffer overflow vulnerability [CWE-122] in FortiOS SSL-VPN could enable a distant unauthenticated attacker to execute arbitrary code or instructions through particularly crafted requests,” the corporate warned.

Underscoring the urgency, Fortinet warned that the vulnerability has already been exploited within the wild.

“Fortinet is conscious of an occasion the place this vulnerability was exploited within the wild, and recommends instantly validating your techniques in opposition to the next indicators of compromise,” the corporate stated, itemizing artifacts and connections to suspicious IP addresses that may assist defenders hunt for infections.

[ Read: Fortinet Confirms Zero-Day Exploited in One Attack ]

An advisory from Fortinet’s PSIRT (product safety incident response group) stated the flaw carries a CVSS severity rating of 9.3/10.  The difficulty is being tracked as CVE-2022-4247.

The most recent FortiOS zero-day comes on the heels of documented nation-state degree APT assaults hitting safety merchandise bought by the Silicon Valley-based Fortinet.

Final month, the corporate privately knowledgeable some clients about zero-day assaults and the provision of patches and workarounds for an authentication bypass vulnerability that uncovered FortiOS and FortiProxy merchandise to distant assaults.

Final April, a joint CISA/FBI advisory known as consideration to a trio of FortiOS VPN flaws that had been being exploited by high-end risk actors. FortiOS merchandise have additionally featured prominently on the CISA “must-patch” Identified Exploited Vulnerabilities listing.

Associated: Fortinet Confirms Zero-Day Vulnerability Exploited in One Assault

Associated: CISA Expands ‘Should-Patch’ Listing With Exploited Log4j, FortiOS Flaws

Associated: FBI, CISO Challenge Joint Warning for Assaults Concentrating on Fortinet FortiOS

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