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Date: 02/08/2023
VMware ESXi hypervisors are being targeted to deploy ransomware to compromised systems, which occurs by exploiting CVE-2021-21974. An unauthenticated attacker on the same network as ESXi who can access port 427 can trigger a heap overflow in the OpenSLP service leading to remote code execution.
Actors are leveraging CVE-2021-21974 to encrypt specific files such as “.vmdk”, “.vmx”, “.vmxf”, “.vmsd”, “.vmsn”, “.vswp”, “.vmss”, “.nvram”,”*.vmem”. Additionally, threat actors have been observed shutting down virtual machines to unlock these files before encryption. A successful attack will have a severe impact.
The fix for CVE-2021-21974 has been available since February 2021 (VMSA-2021-0002). Though it is not confirmed, this may not be the only vulnerability being exploited to target ESXi hosts. It is strongly recommended that organizations keep current with available updates. Regular internal vulnerability assessments are necessary to identify such issues so they can be remediated efficiently.
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Jira Service Management Server and Data Center is affected by a critical vulnerability tracked as CVE-2023-22501 (CVSS score: 9.4). The vulnerability involves user impersonation and requires authentication for exploitation. An attacker can impersonate another user and gain access to Jira Service Management.
With write access to a user directory and outgoing email enabled on a Jira Service Management instance, an attacker could potentially access signup tokens for accounts that have never been logged into. Users who are synced to the Jira service via read-only User Directories or single sign-on (SSO) are not affected, but external users who interact with Jira via email are affected even when SSO is configured.
CVE-2023-22501 was introduced in version 5.3.0 and affects all subsequent versions 5.3.1, 5.3.2, 5.4.0, 5.4.1, and 5.5.0. Fixes are available in versions 5.3.3, 5.3.3, 5.5.1, and 5.6.0 or later. Administrators should ensure that this software is regularly upgraded.
Sources
https://nvd.nist.gov/vuln/detail/CVE-2023-22501
https://thehackernews.com/2023/02/atlassians-jira-software-found.html
SentinelOne security researchers have been tracking the MalVirt malware strand during the early months of 2023 and have published recent findings concerning this malware. Specifically, SentinelOne has noted the MalVirt deploying on Windows machines as a .NET-coded loader. As a loader, MalVirt deploys randomized command and control (C2) traffic to bypass network detections and communicates with cloud-based IP addresses.
MalVirt has been seen masquerading as legitimate Google search engine advertisements. When victims click these links, MalVirt installs itself onto the victim’s machine. Once loaded, MalVirt installs feature-rich information-stealing malware in an attempt to capture user credentials and online payment information.
Malware such as MalVirt is constantly being developed. Organizations can defend against these malware strands by keeping security solutions such as endpoint detection and response (EDR) up to date with the newest malware signatures and behavioral indicators of compromise (IOCs). Additionally, security awareness campaigns can assist in training users to avoid potentially malicious advertisements both on Google and non-Google websites.
Sources
https://www.sentinelone.com/labs/malvirt-net-virtualization-thrives-in-malvertising-attacks/
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Over the course of the last 22 years, Dan has been committed to advancing the state of cybersecurity and has played an instrumental role in the identification and development of critical, next-generation cyber capabilities. He has held positions in almost every facet of cybersecurity, beginning as a computer forensic examiner and progressing through the management and executive leadership ranks. In addition to co-founding AIS, Dan has facilitated multiple cybersecurity startups, raised investment capital and has served in various lead and support roles toward the acquisition of five companies in the last eight years.
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