Microsoft Security Response Center

*Is the Preview Pane an attack vector for this vulnerability?* No, the Preview Pane is not an attack vector.

*If my server is not configured to be a DNS server, it is vulnerable?* No, this vulnerability is only exploitable if the server is configured to be a DNS server.

*What type of information could be disclosed by this vulnerability?* The type of information that could be disclosed if an attacker successfully exploited this vulnerability is the contents of Kernel memory. An attacker could read the contents of Kernel memory from a user mode process.

*What security feature could be bypassed by exploiting this vulnerability?* This vulnerability could allow an attacker to bypass Extended Protection for Authentication provided by SPN target name validation.

*How could an attacker exploit this vulnerability?* For successful exploitation, this vulnerability could allow a malicious guest VM to read kernel memory in the host. To trigger this vulnerability the guest VM requires a memory allocation error to first occur on the guest VM. This bug could be used for a VM escape from guest to host.

*What type of information could be disclosed by this vulnerability?* The type of information that could be disclosed if an attacker successfully exploited this vulnerability is uninitialized memory.

*What type of information could be disclosed by this vulnerability?* The type of information that could be disclosed if an attacker successfully exploited this vulnerability is the contents of Kernel memory. An attacker could read the contents of Kernel memory from a user mode process.

*According to the CVSS, the attack vector is Adjacent. What does that mean and how is that different from a Network vector?* This vulnerability's attack is limited at the protocol level to a logically adjacent topology. This means it cannot simply be done across the internet, but instead needs something specific tied to the target. Good examples would include the same shared physical network (such as Bluetooth or IEEE 802.11), logical network (local IP subnet), or from within a secure or otherwise limited administrative domain (MPLS, secure VPN to an administrative network zone). This is common to many attacks that require man-in-the-middle type setups or that rely on initially gaining a foothold in another environment.

*Why is this OpenSSL Software Foundation CVE included in the Security Update Guide?* The vulnerability assigned to this CVE is in OpenSSL Software which is consumed by Microsoft Visual Studio. It is being documented in the Security Update Guide to announce that the latest builds of Visual Studio are no longer vulnerable. Please see Security Update Guide Supports CVEs Assigned by Industry Partners for more information.

*Why is this OpenSSL Software Foundation CVE included in the Security Update Guide?* The vulnerability assigned to this CVE is in OpenSSL Software which is consumed by Microsoft Visual Studio. It is being documented in the Security Update Guide to announce that the latest builds of Visual Studio are no longer vulnerable. Please see Security Update Guide Supports CVEs Assigned by Industry Partners for more information.