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**How could an attacker exploit the vulnerability?** An authenticated attacker with access to the domain could perform remote code execution on the Sharepoint server to elevate themselves to Sharepoint admin.

**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.

**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.

**How could an attacker exploit this vulnerability?** In most situations, an unauthenticated attacker could send a specially crafted packet to a targeted server utilizing the HTTP Protocol Stack (http.sys) to process packets. **Is this wormable?** Yes. Microsoft recommends prioritizing the patching of affected servers.

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

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

**How could this vulnerability affect my system** A crafted image file could cause a crash in Explorer during browsing of the directory containing the file. **How do I get the updated app?** The Microsoft Store will automatically update affected customers. Alternatively, customers can get the update immediately; see here for details. It is possible for customers to disable automatic updates for the Microsoft Store. The Microsoft Store will not automatically install this update for those customers. **My system is in a disconnected environment; is it vulnerable?** Customers using the Microsoft Store for Business and Microsoft Store for Education can get this update through their organizations. **How can I check if the update is installed?** If your device manufacturer preinstalled this app, package versions **1.0.43421.0** and later contain this update. If you purchased this app from the Microsoft Store, package versions **1.0.43422.0** and later contain this update. You can ch...

**What security feature is bypassed with this vulnerability?** A successful attacker could bypass the WPBT binary verification by using a small number of compromised certificates. Microsoft has added those certificates to the Windows kernel driver block list, driver.stl. Certificates on the driver.stl will be blocked even if present in the Windows Platform Binary Table (WPBT). In addition, Microsoft recommends customers use Windows Defender Application Control (WDAC) to limit what is allowed to run on their devices. WDAC policy is also enforced for binaries included in the WPBT and should mitigate this issue. We recommend customers implement a WDAC policy that is as restrictive as practical for their environment. You can find documentation on WDAC on https://docs.microsoft.com.

Computer accounts have the $ sign appended at the end of their names in contrast with standard user accounts. By default Microsoft operating systems lack… Continue reading → Domain Escalation – sAMAccountName Spoofing

Computer accounts have the $ sign appended at the end of their names in contrast with standard user accounts. By default Microsoft operating systems lack… Continue reading → Domain Escalation – sAMAccountName Spoofing