Tag Archives: RemoteDesktop

June Microsoft Patch Tuesday

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June Microsoft Patch Tuesday

June Microsoft Patch Tuesday. Last week I was on vacation in Veliky Novgorod, so I'm publishing this overview only now. A total of 202 vulnerabilities were addressed, approximately twice as many as in May. There are currently no vulnerabilities marked as exploited in the wild. However, there are two vulnerabilities with publicly available exploits:

🔸 RCE - HTTP.sys (CVE-2026-47291). This critical vulnerability allows remote, unauthenticated attackers to execute arbitrary code on affected systems without user interaction. However, systems using the default MaxRequestBytes registry value in the Windows HTTP stack are not affected. If needed, you can change this registry setting to protect systems while testing and deploying the patch. Microsoft's security bulletin includes instructions and a PowerShell script for this workaround.

🔸 DoS - HTTP.sys (CVE-2026-49160). The same exploit is used as for the previous RCE vulnerability.

It is also worth paying attention to vulnerabilities that Microsoft has flagged as having a publicly available exploit:

🔹 SFB - Windows BitLocker (CVE-2026-50507). A successful attacker could bypass the BitLocker Device Encryption feature on the system storage device. An attacker with physical access to the target could exploit this vulnerability to gain access to encrypted data. According to Tenable, this is the "Bitskrieg" vulnerability discovered by the researcher known as Chaotic Eclipse/Nightmare Eclipse.

🔹 SFB - Secure Boot (CVE-2026-48570). An attacker who successfully exploited this vulnerability could bypass Secure Boot. This vulnerability was reported by Alon Leviev (STORM), who is known for previous research related to BootKitty and BlackLotus.

Among the remaining vulnerabilities, the following are worth highlighting:

🔹 RCE - Windows Kernel (CVE-2026-45657). This vulnerability allows remote, unauthenticated attackers to run code with SYSTEM privileges without any user interaction. In other words, it could be used to spread automatically between systems. The issue is caused by how the Windows kernel processes TCP/IP traffic. Microsoft rated this as "Exploitation Less Likely", but security researchers and exploit developers are already analyzing the patch and trying to build an exploit. Test and deploy this patch as soon as possible.

🔹 EoP - Windows Collaborative Translation Framework (CTFMON) (CVE-2026-45586). This vulnerability affects a component used for voice and handwriting recognition. If exploited, an attacker could gain SYSTEM privileges. Microsoft rates this vulnerability as "Exploitation More Likely".

🔹 RCE - Windows Remote Desktop Client (CVE-2026-42909, CVE-2026-42913, CVE-2026-42985, CVE-2026-42992, CVE-2026-42993, CVE-2026-44799, CVE-2026-44801, CVE-2026-47289, CVE-2026-47653, CVE-2026-47654, CVE-2026-48563). Successful exploitation would require a victim to connect to an attacker-controlled server using an affected version of the Remote Desktop Client. This action could trigger a heap-based buffer overflow, resulting in remote code execution.

🔹 RCE - DHCP Client Service (CVE-2026-44815). This vulnerability allows remote, unauthenticated attackers to execute code on affected systems without user interaction. Because the DHCP client is widely enabled across Windows systems, this vulnerability presents a broad attack surface. Organizations should prioritize testing and deploying the patch for this vulnerability as soon as possible.

🗒 Full Vulristics report

April Microsoft Patch Tuesday

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April Microsoft Patch Tuesday

April Microsoft Patch Tuesday. A total of 167 vulnerabilities, about twice as many as in March. There is one vulnerability already being exploited in the wild:

🔻 Spoofing - Microsoft SharePoint Server (CVE-2026-32201). ZDI experts say "Spoofing bugs in SharePoint often manifest as cross-site scripting (XSS) bugs". "An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality), make changes to disclosed information (Integrity), but cannot limit access to the resource (Availability)". There is no info yet about how widely it is being used in attacks, but you should not delay patching, especially if SharePoint is exposed to the Internet.

Formally, there are no public exploits yet. However, there are strong indications that a public exploit may already exist for one vulnerability.

🔸 EoP - Microsoft Defender (CVE-2026-33825). "Insufficient granularity of access control" in Microsoft Defender allows a logged-in attacker to gain higher privileges on a local system. Tenable and ZDI say the bug looks similar to the BlueHammer zero-day, for which a public exploit was released on GitHub on April 3. The researcher who published it, Chaotic Eclipse, criticized Microsoft’s disclosure process. ZDI says the exploit is real, but exploitation is unstable and not always reliable.

Other important issues:

🔹 RCE - Windows Active Directory (CVE-2026-33826). To exploit this, the attacker must have an account. The attacker sends a specially crafted RPC request to a vulnerable server, which can lead to code execution. Microsoft says the attacker must be in the same restricted Active Directory domain as the target system.

🔹 RCE - Windows Internet Key Exchange (IKE) Service Extensions (CVE-2026-33824). ZDI says this vulnerability is wormable, meaning it could allow malware to spread automatically between systems. It affects systems with IKE enabled, which creates a large attack surface. Microsoft recommends blocking UDP ports 500 and 4500 at the network edge. However, attackers inside the network can still use it for lateral movement. Patch quickly if you use IKE.

🔹 RCE - Windows TCP/IP (CVE-2026-33827). ZDI also says this may be wormable, especially on systems using IPv6 and IPSec. A race condition makes it harder to exploit, but similar bugs are often exploited at Pwn2Own, so you should not rely on that difficulty. If you use IPv6, test and deploy the patch quickly before exploits appear.

🔹 EoP - Windows Push Notifications (CVE-2026-26167). This Patch Tuesday includes several sandbox escape vulnerabilities, including in Push Notifications, AFD for Winsock, Windows Management Services, and User Interface Core. CVE-2026-26167 (Push Notifications) is the most important because it is the only one with low attack complexity. The others require winning a race condition (AC:H).

🔹 Spoofing - Remote Desktop (CVE-2026-26151). Weak warnings in the Remote Desktop interface allow a network attacker to trick a user into opening a specially crafted file, leading to spoofing. The issue was found by the UK National Cyber Security Centre (NCSC).

🗒 Full Vulristics report