New ESXiArgs encryption routine outmaneuvers recovery methods

In what seems to be a typical arms race where one side responds to counter the progress the other side has made, the ransomware group behind the massive attack on ESXi Virtual Machines VMs has come up with a new variant that can no longer be decrypted with the recovery script released by the...

VMware ESXi OpenSLP heap overflow

Added: 02/10/2023 Background VMware ESXi is a bare metal hypervisor. Problem A heap overflow vulnerability in the OpenSLP service could allow an attacker on the same network segment to execute arbitrary commands. Resolution Upgrade to a fixed version referenced in VMSA-2021-0002 or disable the SL...

VMware ESXi OpenSLP heap overflow

Added: 02/10/2023 Background VMware ESXi is a bare metal hypervisor. Problem A heap overflow vulnerability in the OpenSLP service could allow an attacker on the same network segment to execute arbitrary commands. Resolution Upgrade to a fixed version referenced in VMSA-2021-0002 or disable the SL...

Nearly 19,000 ESXi Servers Still Vulnerable to CVE-2021-21974

Last week, multiple organizations issued warnings that a ransomware campaign dubbed “ESXiArgs” was targeting VMware ESXi servers, allegedly by leveraging CVE-2021-21974—a nearly two-year-old heap overflow vulnerability. Two years. And yet, Rapid7 research has found that a significant number of ES...

The ESXiArgs ransomware attack is targeting VMware ESXi servers globally

Threat Level Attack Report For a detailed threat advisory, download the pdf file here Summary A global ransomware attack, known as ESXiArgs, is affecting servers using VMware ESXi hypervisors version 6.x prior to 6.7 due to a vulnerability CVE-2021-21974 caused by a heap overflow issue in the Ope...

ESXiArgs Ransomware Virtual Machine Recovery Guidance

Summary The Cybersecurity and Infrastructure Security Agency CISA and the Federal Bureau of Investigation FBI are releasing this joint Cybersecurity Advisory CSA in response to the ongoing ransomware campaign, known as “ESXiArgs.” Malicious actors may be exploiting known vulnerabilities in VMware...

Ransomware Targets Outdated VMware ESXi Hypervisors: Protect Your Systems Now!

Updated on February 8, 2023 at 2:40 PM Pacific Standard Time: This article has been updated with EVALUATE Vendor-Suggested Mitigation with Policy Compliance PC Updated on February 7, 2023 at 9:05 PM Pacific Standard Time: This article has been updated with the latest information on the...

CISA and FBI Release ESXiArgs Ransomware Recovery Guidance

Today, CISA and the Federal Bureau of Investigation FBI released a joint Cybersecurity Advisory, ESXiArgs Ransomware Virtual Machine Recovery Guidance. This advisory describes the ongoing ransomware campaign known as “ESXiArgs.” Malicious cyber actors may be exploiting known vulnerabilities in...

CVE-2021-21974

A heap overflow vulnerability was found in OpenSLP as used in ESXi 7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG. This flaw allows a malicious actor residing within the same network segment as ESXi, who has access to port 427, to trigger the heap...

Ransomware attacks targeting VMware ESXi servers: everything you need to know

Recent attacks leverage CVE-2021-21974 to install ransomware on VMWare ESXi servers. Security teams are advised to patch and stay vigilant for indicators of compromise...

VMware Finds No Evidence of 0-Day in Ongoing ESXiArgs Ransomware Spree

VMware on Monday said it found no evidence that threat actors are leveraging an unknown security flaw, i.e., a zero-day, in its software as part of an ongoing ransomware attack spree worldwide. "Most reports state that End of General Support EoGS and/or significantly out-of-date products are bein...

Ransomware Campaign Compromising VMware ESXi Servers

On February 3, 2023, French web hosting provider OVH and French CERT issued warnings about a ransomware campaign that was targeting VMware ESXi servers worldwide with a new ransomware strain dubbed “ESXiArgs.” The campaign appears to be leveraging CVE-2021-21974, a nearly two-year-old heap overfl...

[update]Two year old vulnerability used in ransomware attack against VMware ESXi

On Friday and over the weekend, several Computer Emergency Response Teams CERTs sounded the alarm about an ongoing large scale ransomware attack on VMware ESXi virtual machines. With some discrepancies between Shodan queries from various researchers, most agree that an estimated 500 entities were...

New Wave of Ransomware Attacks Exploiting VMware Bug to Target ESXi Servers

VMware ESXi hypervisors are the target of a new wave of attacks designed to deploy ransomware on compromised systems. "These attack campaigns appear to exploit CVE-2021-21974, for which a patch has been available since February 23, 2021," the Computer Emergency Response Team CERT of France said i...

Unveiling the Advanced Rust-based Nevada Ransomware

Threat Level Attack Report For a detailed threat advisory, download the pdf file here Summary A new type of ransomware named "Nevada Ransomware" has been identified. The creators of this ransomware have established an affiliate program that was initially introduced in the RAMP underground...

VulnCheck KEV: CVE-2021-21974

OpenSLP as used in ESXi 7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue...

VMware ESXi 7.0 / 8.0 Heap Out-of-bounds Write (VMSA-2022-0033)

VMware ESXi contain a heap out-of-bounds write vulnerability in the USB 2.0 controller EHCI. A malicious actor with local administrative privileges on a virtual machine may exploit this issue to execute code as the virtual machine's VMX process running on the host. The exploitation is contained...

VMware ESXi TCP/IP Memory Corruption Local Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on affected installations of VMware ESXi. An attacker must first obtain the ability to execute low-privileged code on the target host system in order to exploit this vulnerability. The specific flaw exists within the TCPIP kernel...

VMware tackles security flaws in ESXi and vRealize

Threat Level Vulnerability Report For a detailed threat advisory, download the pdf file here Summary VMware addressed security weaknesses to address a critical-severity vulnerability affecting ESXi, Workstation, Fusion, and Cloud Foundation, as well as a critical-severity command injection flaw...

ESXi 6.5 / 6.7 / 7.0 Multiple Vulnerabilities (VMSA-2022-0030)

The remote VMware ESXi host is version 6.5, 6.7 or 7.0 and is affected by multiple vulnerabilities, as follows: - A memory corruption issue that can lead to an escape of the ESXi sandbox. CVE-2022-31696 - A heap overflow vulnerability that can be exploited to disclose information. CVE-2022-31699...