Windows Networks Group Policy Hijacking Attacks
For those of you that didn’t make it to SyScan ‘15 last week, this is a blog post version of the presentation I gave about the vulnerabilities I found in group policy that resulted in Microsoft releasing MS15-011 and MS15-014 in February. These bulletins resolve issues in Microsoft’s group policy engine that allow remote code execution at SYSTEM level if an attacker can intercept network traffic from a domain-joined system.
The full process leading up to their discovery, along with exploitation details and accompanying video demonstrations, will be given. Additionally, the new security controls introduced by Microsoft will be discussed to assess how effective they are, show what attack scenarios they mitigate and which ones they do not. Finally, some additional guidance will be given on other mitigating controls that can provide additional protection will be discussed.
How does group policy work?
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