Update April 10: The blog has been updated to include reference to exploitation for CVE-2024-29988 and the addition of CVE-2024-26234.

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CVE-2024-29988 is a security feature bypass vulnerability in Microsoft Defender SmartScreen. It was assigned a CVSSv3 score of 8.8 and is rated as important. An attacker could exploit this vulnerability by convincing a target to open a specially crafted file using social engineering tactics such as an external link or malicious attachment sent over email, instant messages or social media. This flaw was reported to Microsoft by some of the same researchers that disclosed CVE-2024-21412, an Internet Shortcut Files security feature bypass that was associated with a DarkGate campaign using fake installer files impersonating Apple iTunes, Notion, NVIDIA and others.

The Zero Day Initiative (ZDI) says one of the researchers credited with reporting this flaw through ZDI discovered it being exploited in the wild as a zero-day. However, Microsoft has yet to update its advisory to reflect this finding. We will update this blog once Microsoft confirms exploitation.

CVE-2024-26234 is a spoofing vulnerability in the Proxy Driver of Microsoft Windows. It was assigned a CVSSv3 score of 6.7 and is rated as important. Initially, Microsoft did not flag this as being exploited. However, researchers at Sophos published a blog post that confirmed exploitation, which is now reflected in the Microsoft advisory for this vulnerability. According to Sophos, this was bundled as part of a fake Android Screen Mirroring application, LaiXi, which was signed using the Microsoft Windows Hardware Compatibility Program (WHCP). It has now been added to the Windows Driver.STL revocation list.

CVE-2024-29990 is an EoP vulnerability in the Azure Kubernetes Service Confidential Containers (AKSCC). It was assigned a CVSSv3 score of 9 and is rated important. Exploitation of this flaw hinges on the preparation of a target environment by an attacker. Successful exploitation would enable an attacker to “steal credentials and affect resources beyond the security scope managed by AKSCC.” This includes taking over both “confidential guests and containers beyond the network stack it might be bound to.”

This is the third month in a row that a flaw in AKSCC was patched as part of Patch Tuesday:

All four of these vulnerabilities were reported to Microsoft by Yuval Avrahami of Palo Alto Networks.

This month’s release included 41 CVEs affecting multiple drivers for SQL Server, the Open Database Connectivity (ODBC) driver, WDAC OLE DB Driver and OLE DB driver. All but one of these CVEs received CVSSv3 scores of 8.8, with the lone exception, CVE-2024-29045 receiving a 7.5. All were rated as “Exploitation Less Likely” according to the Microsoft Exploitability Index, with none being publicly disclosed or exploited in the wild. A full list of the CVEs is included in the table below.

Microsoft patched 24 CVEs in Windows Secure Boot in as part of the April 2024 Patch Tuesday release. All are rated as “Exploitation Less Likely” and vary in CVSSv3 scores from 4.1 to 8.0.

Four of the 24 CVEs were assigned a CVSSv3 score of 8.0. They include CVE-2024-26240, CVE-2024-26189, CVE-2024-28925 and CVE-2024-26180. Exploitation of all of these flaws do require an attacker to have either physical access or local administrator privileges on the vulnerable device.

These 24 CVEs are the first bundle of Secure Boot vulnerabilities we’ve seen since May 2023, when Microsoft patched CVE-2023-24932, another security feature bypass flaw in Secure Boot that was exploited in the wild as part of the BlackLotus UEFI bootkit.