September 30, 2016

Microsoft Release a Critical Remote Desktop Fix for Patch Tuesday

(LiveHacking.Com) – Microsoft’s ‘Patch Tuesday’ was relatively small this month with just one Critical bulletin issued. The patch (MS12-020) addresses an issue in the Remote Desktop Protocol (RDP). The vulnerability, which was privately reported to Microsoft, could allow an attacker to achieve remote code execution on a machine running RDP. If the machine does not have Network Level Authentication (NLA) enabled, the attacker would not require authentication for RCE access. To launch the attack, the hacker needs to send a sequence of specially crafted RDP packets to an affected system. However by default the Remote Desktop Protocol (RDP) is not enabled on any Windows operating system and therefore systems that do not have RDP enabled are not at risk.

The rest of the bulletins issued by Microsoft comprise of four Important issues and a single Moderate one. In total these bulletins address seven issues in Microsoft Windows, Visual Studio, and Expression Design.

The remaining bulletins are:

  • MS12-017 – Vulnerability in DNS Server Could Allow Denial of Service. This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow denial of service if a remote unauthenticated attacker sends a specially crafted DNS query to the target DNS server.
  • MS12-018 – Vulnerability in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege. This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker logs on to a system and runs a specially crafted application. An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability.
  • MS12-021 – Vulnerability in Visual Studio Could Allow Elevation of Privilege. This security update resolves one privately reported vulnerability in Visual Studio. The vulnerability could allow elevation of privilege if an attacker places a specially crafted add-in in the path used by Visual Studio and convinces a user with higher privileges to start Visual Studio. An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
  • MS12-022 – Vulnerability in Expression Design Could Allow Remote Code Execution. This security update resolves one privately reported vulnerability in Microsoft Expression Design. The vulnerability could allow remote code execution if a user opens a legitimate file (such as an .xpr or .DESIGN file) that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the legitimate file, Microsoft Expression Design could attempt to load the DLL file and execute any code it contained. For an attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open a legitimate file (such as an .xpr or .DESIGN file) from this location that is then loaded by a vulnerable application.
  • MS12-019 – Vulnerability in DirectWrite Could Allow Denial of Service. This security update resolves a publicly disclosed vulnerability in Windows DirectWrite. In an Instant Messager-based attack scenario, the vulnerability could allow denial of service if an attacker sends a specially crafted sequence of Unicode characters directly to an Instant Messenger client. The target application could become unresponsive when DirectWrite renders the specially crafted sequence of Unicode characters.
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