On Tuesday, I sent alerts about Microsoft Patch Day and their more severe Windows bulletins. If you haven’t jumped on those Windows updates yet, I recommend you do so — especially the RDP one. However, Microsoft also released two other less severe bulletins this week, fixing security flaws in Visual Studio and Expression Studio as well. I suspect fewer people use these specialized products. Nonetheless, if you are someone who does, you should definitely apply these patches, too.
I quickly summarize the two remaining March Microsoft bulletins below:
- MS12-021: Visual Studio Elevation of Privilege Vulnerability
Visual Studio is Microsoft’s popular software development environment. If you have any Windows developers in your organization, you likely have it. Visual Studio suffers from a security issue involving the way it loads add-ins. If an attacker can physically gain access to a computer with Visual Studio, and can place a specially crafted add-in file into a specific directory, she could gain full administrator access to that computer. However, if attackers already have log-in credentials, and access to your computer’s file system, you have bigger fish to fry. This issue primarily poses an insider threat.
Microsoft rating: Important
- MS12-022: Expression Design Code Execution Vulnerability
Expression Design is a vector-based graphic illustration program. It suffers from a Dynamic Link Library (DLL) loading class of vulnerability that we’ve described in many previous Microsoft alerts. In a nutshell, this class of flaw involves an attacker enticing one of your users into opening some sort of booby-trapped file from the same location as a specially crafted, malicious DLL file. If you do open the booby-trapped file, it will execute code in the malicious DLL file with your privileges. If you have local administrative privileges, the attacker could exploit this type of issue to gain complete control of your computer. In this particular case, the vulnerability is triggered by .xpr and .DESIGN files for Expression Studio.
Microsoft rating: Important
Though I don’t feel these flaws are as severe as the Windows ones I described earlier this week, they do still pose some risk to users who have these applications. I suggest you patch them at your earliest convenience. — Corey Nachreiner, CISSP (@SecAdept)
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