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Showing posts with label Fortinet FortiOS. Show all posts

Cring Ransomware Attacks Exploited Fortinet Flaw

 

Ransomware operators shut down two production facilities having a place with a European manufacturer in the wake of conveying a relatively new strain that encrypted servers that control a manufacturer's industrial processes, a researcher from Kaspersky Lab said on Wednesday. Threat actors are abusing a Fortinet vulnerability flagged by the feds a week ago that conveys a new ransomware strain, named Cring, that is targeting industrial enterprises across Europe. 

Researchers say the attackers are misusing an unpatched path-reversal flaw, followed as CVE-2018-13379, in Fortinet's FortiOS. The objective is to access the victim's enterprise networks and eventually convey ransomware, as indicated by a report by Kaspersky Lab. “In at least in one case, an attack of the ransomware resulted in a temporary shutdown of the industrial process due to servers used to control the industrial process becoming encrypted,” Kaspersky senior security researcher Vyacheslav Kopeytsev wrote in the report. 

Cring is relatively new to the ransomware threat scene—which as of now incorporates prevailing strains REvil, Ryuk, Maze, and Conti. Cring was first noticed and revealed by the analyst who goes by Amigo_A and Swisscom's CSIRT team in January. The ransomware is one of a kind in that it utilizes two types of encryption and annihilates backup files to threaten victims and keep them from retrieving backup files without paying the ransom. A week ago, the FBI and the Cybersecurity and Infrastructure Security Agency (CISA) cautioned that nation-state advanced persistent threat (APT) groups were effectively abusing known security vulnerabilities in the Fortinet FortiOS operating system, influencing the organization's SSL VPN items. 

In its report, Kaspersky echoed the feds cautioning adding attackers are first scanning connections with Fortinet VPNs to check whether the software utilized on the gadget is the vulnerable version. The objective is to crack open affected hardware, give adversaries admittance to network credentials, and build up traction in the targeted network, Kopeytsev clarified. “A directory-traversal attack allows an attacker to access system files on the Fortigate SSL VPN appliance,” he wrote. “Specifically, an unauthenticated attacker can connect to the appliance through the internet and remotely access the file ‘sslvpn_websession,’ which contains the username and password stored in cleartext.”

FBI & CISA Warns of Active Attacks on Fortinet FortiOS Servers

 

The Federal Bureau of Investigation (FBI) and Cybersecurity and Infrastructure Security Agency (CISA) have released a Joint Cybersecurity Advisory (CSA) to warn users and administrators of active exploits targeting three susceptibilities in Fortinet FortiOS. Fortinet FortiOS is an operating system designed to improve enterprise security and it enables secure networks, endpoints, and clouds to keep the user safe from vulnerabilities and threats. 

According to the advisory, these three unpatched vulnerabilities in Fortinet FortiOS platforms belong to technology services, government agencies, and other private sector bodies. The advanced persistent threat (APT) actors are targeting the vulnerabilities CVE-2018-13379, a path traversal vulnerability (CVSS base score of 9.8); CVE-2020-12812, an improper authentication flaw (CVSS base score of 9.8) and CVE-2019-5591, a default configuration vulnerability (CVSS base score of 7.5) which were initially revealed in 2019.

The attackers have specifically exploited the vulnerability CVE-2018-13379 since its discovery in 2018. In 2019, nation-state hackers exploited the flaw and targeted the U.S. National Security Agency. Last year in October, a joint CISA/FBI advisory regarding federal, state, and local U.S. government networks being targeted mentioned the flaw.

“The APT actors may be using any or all of these CVEs to gain access to networks across multiple critical infrastructure sectors to gain access to key networks as pre-positioning for follow-on data exfiltration or data encryption attacks. APT actors may use the other CVEs or common exploiting techniques – such as spear-phishing – to gain access to critical infrastructure networks to pre-position for follow-on attacks,” the advisory read.

Carl Windsor, Fortinet field chief technology officer responded to the joint advisory by stating that Fortinet has already patched the flaws and is educating the customers regarding the vulnerabilities.

“The security of our customers is our first priority. CVE-2018-13379 is an old vulnerability resolved in May 2019. Fortinet immediately issued a PSIRT advisory and communicated directly with customers and via corporate blog posts on multiple occasions in August 2019 and July 2020 strongly recommending an upgrade. Upon resolution we have consistently communicated with customers, as recently as late as 2020,” he further stated.