Black Arrow Cyber Advisory 12 July 2023 – Microsoft Patch Tuesday, including 6 actively exploited vulnerabilities, and Adobe Updates

Executive summary

Microsoft’s July 2023 Patch Tuesday provides updates to address 138 security issues across its product range, including six actively exploited zero-day vulnerability. The exploited zero-day vulnerabilities use a range of Microsoft Windows products to bypass security features, elevate privileges and perform remote code execution. Among the updates provided by Microsoft 9 addressed critical vulnerabilities.

What’s the risk to me or my business?

The actively exploited vulnerabilities could allow an attacker with standard user access, to gain elevated privileges, or install kernel drivers, depending on the exploit used. Other risks such as bypassing security features of Microsoft Outlook and performing remote code execution can occur. This could allow an attacker to further compromise the confidentiality, integrity and availability of the organisation’s information assets.

What can I do?

Security updates are available for all supported versions of Windows impacted. The updates should be applied as soon as possible for the actively exploited vulnerability and all other vulnerabilities. Other mitigations have been provided by Microsoft and can be found below in the further detail’s section.

Technical Summary

CVE-2023-32046 – The actively exploited vulnerability targets MSHTML Platform which could allow an attacker to elevate their privileges to the rights the user that is running the affected application is.

CVE-2023-32049 – This actively exploited vulnerability targets Windows SmartScreen allowing an attacker to bypass security features including the security warning prompt.

CVE-2023-36874 – This actively exploited vulnerability targets the Windows Error Reporting Service allowing an attacker to elevate privileges allowing them to gain administrator privileges.

CVE-2023-36884 – This actively exploited vulnerability targets the Office and Windows HTML allowing an attacker to perform remote code execution.

CVE-2023-35311 – This actively exploited vulnerability targets Microsoft Outlook and bypasses a security feature however to exploit this an attacker would have to have a user click in a specially crafted link through phishing or social engineering.

ADV230001 – This is a Microsoft signed driver that has been maliciously used in post-exploitation activity which abused a Windows policy loophole to install malicious kernel-mode drivers.

Adobe

This month, Adobe released fixes for 4 vulnerabilities, of which 3 were rated critical across Adobe InDesign and Adobe ColdFusion. At current, Adobe are not aware of any active exploitation of the listed vulnerabilities, however the advice is to update the affected products using their priority rating which can be found in the details below. The vulnerabilities include remote code execution, memory leak and security bypass.

Further details on other specific updates within this patch Tuesday can be found here:

https://www.bleepingcomputer.com/news/microsoft/microsoft-july-2023-patch-tuesday-warns-of-6-zero-days-132-flaws/

Further details about CVE-2023-32046 can be found here:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-32046

Further details about CVE-2023-32049 can be found here:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-32049

Further details about CVE-2023-36874 can be found here:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36874

Further details about CVE-2023-36884 can be found here:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36884

Further details about CVE-2023-35311 can be found here:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311