Microsoft Security Response Center

**How could an attacker exploit this vulnerability?** An attacker could exploit this vulnerability by tricking a user into sending a request to a malicious server. This could result in the server returning malicious data that might cause arbitrary code execution on the user's system.

**What privileges could be gained by an attacker who successfully exploited this vulnerability?** An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

**What kind of security feature could be bypassed by successfully exploiting this vulnerability?** An attacker who successfully exploited this vulnerability could bypass the SmartScreen user experience.

**According to the CVSS metric, the attack complexity is high (AC:H) and user interaction is required (UI:R). What does that mean for this vulnerability?** An attacker would need to trick the user to transfer a malicious JSON file and hope that user does not open and review it. If the user opens it, the user will see an invalid URL and not import it for his dashboard. But in a scenario where the user does import the malicious JSON file, the portal will not immediately send a token. Only in a corner case that a user configures the dashboard again from the portal will there be a token leak.

**What privileges could be gained by an attacker who successfully exploited this vulnerability?** An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

**Why is this Red Hat, Inc. CVE included in the Security Update Guide?** The vulnerability assigned to this CVE is in Linux Shim boot. It is being documented in the Security Update Guide to announce that the latest builds of Microsoft Windows address this vulnerability by blocking old, unpatched, Linux boot loaders by applying SBAT (Secure Boot Advanced Targeting) EFI variables in the UEFI library. Please see Security Update Guide Supports CVEs Assigned by Industry Partners for more information. For more information see: CVE-2023-40547.

**The following mitigating factors might be helpful in your situation:** * Users are advised against installing or enabling the Line Printer Daemon (LPD) service. * The LPD is not installed or enabled on the systems by default. * The LPD has been announced as deprecated since Windows Server 2012. Please refer to: Features Removed or Deprecated in Windows Server 2012.

**According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an attacker to win a race condition.

**According to the CVSS metric, successful exploitation of this vulnerability could lead to some loss of confidentiality (C:L) and integrity (I:L) but does not impact availability (A:N)? What does that mean for this vulnerability?** The attacker is only able to modify the sender's name of Teams message (I:L) and through social engineering, attempt to trick the recipient into disclosing information (C:L). The availability of the product cannot be affected (A:N).

**What privileges could be gained by an attacker who successfully exploited this vulnerability?** An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.