| CVE |
Vendors |
Products |
Updated |
CVSS v3.1 |
| We have investigated reports of a spoofing vulnerability in AppX installer that affects Microsoft Windows. Microsoft is aware of attacks that attempt to exploit this vulnerability by using specially crafted packages that include the malware family known as Emotet/Trickbot/Bazaloader.
An attacker could craft a malicious attachment to be used in phishing campaigns. The attacker would then have to convince the user to open the specially crafted attachment. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
Please see the Security Updates table for the link to the updated app. Alternatively you can download and install the Installer using the links provided in the FAQ section.
Please see the Mitigations and Workaround sections for important information about steps you can take to protect your system from this vulnerability.
December 27 2023 Update:
In recent months, Microsoft Threat Intelligence has seen an increase in activity from threat actors leveraging social engineering and phishing techniques to target Windows OS users and utilizing the ms-appinstaller URI scheme.
To address this increase in activity, we have updated the App Installer to disable the ms-appinstaller protocol by default and recommend other potential mitigations. |
| Buffer over-read in Windows GDI+ allows an unauthorized attacker to deny service over a network. |
| Insertion of sensitive information into log file in Windows Kernel allows an authorized attacker to disclose information locally. |
| Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Kernel allows an authorized attacker to elevate privileges locally. |
| Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally. |
| Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally. |
| Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally. |
| Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally. |
| Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally. |
| Time-of-check time-of-use (toctou) race condition in Windows HTTP.sys allows an authorized attacker to elevate privileges locally. |
| Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally. |
| Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally. |
| External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing locally. |
| Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally. |
| Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally. |
| Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally. |
| Improper authentication in Windows Storage allows an authorized attacker to elevate privileges locally. |
| Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally. |
| Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network. |
| Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network. |
