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Date: 08/16/2023
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has released a vulnerability in Microsoft’s .NET and Visual Studio products to the known Exploited Vulnerabilities catalogue. The vulnerability is tracked as CVE-2023-38180 (CVSS score: 7.5).
Exploitation can occur without elevated privileges or user interaction. Many details surrounding how exploitation occurs is unclear, but a proof-of-concept does exist. Exploitation may result in denial-of-service conditions at least. It should also be noted that exploitation may only be possible in certain circumstances.
Affected versions include ASP.NET Core 2.1, .NET 6.0, .NET 7.0, Microsoft Visual Studio 2022 version 17.2, Microsoft Visual Studio 2022 version 17.4, and Microsoft Visual Studio 2022 version 17.6. CVE-2023-38180 was addressed as part of the August 2023 patch Tuesday updates and organizations should ensure this fix has been applied. For systems where this software cannot be updated, ensure multiple levels of security exist such as Endpoint Detection & Response tools and content filtering for web browsing.
Sources
https://thehackernews.com/2023/08/cisa-adds-microsoft-net-vulnerability.html
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-38180
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In recent years there have been major breaches traced back to attackers targeting the personal devices of individuals. For example, the well known LastPass breach involved the compromise of a Senior Developer’s home computer. The trend is that motivated attackers are searching for the right individuals to target and ultimately pivot to launch an attack against their organization.
Potential Impact
These attacks are often highly impactful and could result in ransomware deployment, data exfiltration, or both. Note that techniques and exploits used by attackers in these situations will vary.
Perform awareness training to ensure high ranking individuals are practicing good cyber hygiene such as limiting publicly available contact information, limiting social media posts that include personal details, and ensuring unique and strong passwords for all accounts with the addition of multifactor authentication. Organizations should also ensure corporate data being accessed on personal devices is controlled. For example, implementing a mobile device management platform allows security controls to be applied. Additionally, corporate data should only be accessed through approved applications.
Sources
https://www.helpnetsecurity.com/2023/08/11/personal-devices-risks/?web_view=true
https://www.helpnetsecurity.com/2023/02/28/lastpass-breach-corporate-vault/
On August 9, 2023, CISA published details on malware used in attacks against Barracuda Email Security (ESG) Gateways by leveraging CVE-2023-2868 . The report provides details and YARA rules for malware named “Whirlpool”, “Seaspy”, and “Submarine”.
Threat actors exploiting CVE-2023-2868 are known to exfiltrate data and move laterally into victim networks. Consider the potential impact of a compromised ESG device as severe.
Ensure that Barracuda ESG devices are running the latest software version. In cases of device compromise, the physical device needs to be replaced.
Sources
https://www.cisa.gov/news-events/alerts/2023/07/28/cisa-releases-malware-analysis-reports-barracuda-backdoors
https://www.mandiant.com/resrgb(41, 105, 94)ources/blog/barracuda-esg-exploited-globally
Updates released by Microsoft on August 8, 2023 patch six flaws ranked as “Critical”. The updates include a patch for Microsoft Exchange servers.
Exploitation of the flaws patched this month can result in remote code execution and privilege escalation. Threat actors exploiting these flaws will likely use their access for data exfiltration and broader network compromise.
Critical flaws should be patched as soon as possible. Because Microsoft Exchange is a favorite target for threat actors, and Exchange servers are generally publicly accessible, prioritize patching for CVE-2023-21709.
Sources
https://krebsonsecurity.com/2023/08/microsoft-patch-tuesday-august-2023-edition/
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