On October 2, 2023, Exim released security fixes for an out-of-bounds write remote code execution (RCE) vulnerability (CVE-2023-42115, CVSS: 9.8). This vulnerability affects the Simple Mail Transfer Protocol (SMTP) service and is caused by improper validation of user input. A threat actor can remotely exploit CVE-2023-42115 by writing data beyond the boundaries of a buffer, which leads to the execution of arbitrary code.

On September 7, 2023, Apple released emergency security updates to fix a buffer overflow vulnerability (CVE-2023-41064) impacting macOS, iOS, iPadOS, and watchOS products that was used in a zero-click exploitation chain by the NSO Group. Shortly after, on September 11, 2023, Google released an update to fix a buffer overflow vulnerability (CVE-2023-4863) in Google Chrome, which was reported by Apple’s Security Engineering and Architecture (SEAR) and Citizen Lab.

On September 27, 2023, Progress Software released a security advisory detailing multiple vulnerabilities in their WS_FTP Server product, including two with a critical severity rating. CVE-2023-40044 (CVSS 10) is a deserialization vulnerability that affects the Ad Hoc Transfer module and could allow a threat actor to obtain remote code execution if successfully exploited.

On September 20, 2023, JetBrains published a blog detailing a critical Remote Code Execution (RCE) vulnerability that was identified in TeamCity On-Premises (CVE-2023-42793). This vulnerability has a Common Vulnerability Scoring System (CVSS) score of 9.8 and can allow an unauthenticated attacker with HTTP(S) access to a TeamCity server to perform RCE. All versions of TeamCity On-Premises are affected by this vulnerability.

On September 21, 2023, Apple released emergency security updates to fix three vulnerabilities impacting macOS, iOS, iPadOS, and Safari. Citizen Lab and Google Threat Analysis Group (TAG) observed these three vulnerabilities exploited in an exploit chain against a former Egyptian Member of Parliament to deploy Predator spyware. Predator was developed by Intellexa/Cytrox to perform surveillance on targeted mobile devices.

In the last few weeks, Arctic Wolf Labs has noted an increase in threat activity targeting Okta as an attack vector. The relevant Techniques, Tools, and Procedures (TTPs) span across several different types of attacks. This bulletin will review several key aspects of these attacks.

Two giants in the gaming and hospitality industry, Caesars Entertainment and MGM Resorts, recently announced that they were targeted by cybercriminals. But here’s the catch, both ransomware attacks appear to have started with the use of social engineering tactics against IT helpdesk personnel to gain access to systems.

While ransomware continues to be a top concern for organizations, Business Email Compromise (BEC) incidents have been rising and targeting all industries. Based on the FBI’s most recent Internet Crime Report, BEC complaints outpace those of ransomware 10:1, and the losses incurred by BEC are 80 times greater than those incurred by ransomware.

Cybersecurity compliance is complicated. As the cybersecurity industry changes, so do compliance requirements and, depending on your organization’s operations, compliance could mean adhering to multiple frameworks and reporting to multiple governing bodies. In fact, 67% of organizations surveyed by Arctic Wolf follow between one to three sets of guidelines.

On September 7, 2023, Apple released emergency security updates to fix a buffer overflow vulnerability (CVE-2023-41064) and a validation issue vulnerability (CVE-2023-41061) among macOS, iOS, iPadOS, and watchOS products. These vulnerabilities can be exploited with a maliciously crafted attachment or image which leads to arbitrary code execution.