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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.
Metrics
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vector strings. CVSS information contributed by other sources is also
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AND
OR
*cpe:2.3:a:microsoft:app_installer:*:*:*:*:*:*:*:* versions up to (excluding) 1.11
OR
cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*
Changed
CPE Configuration
AND
OR
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:x86:*
OR
*cpe:2.3:a:microsoft:app_installer:*:*:*:*:*:*:*:*
AND
OR
*cpe:2.3:a:microsoft:app_installer:*:*:*:*:*:*:*:* versions up to (excluding) 1.16
OR
cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_21h1:-:*:*:*:*:*:*:*
cpe:2
Changed
Reference Type
https://github.com/ChrisTitusTech/winutil/pull/26 No Types Assigned
https://thehackernews.com/2023/12/microsoft-disables-msix-app-installer.html No Types Assigned
https://thehackernews.com/2023/12/microsoft-disables-msix-app-installer.html Press/Media Coverage, Third Party Advisory
Changed
Reference Type
https://www.bleepingcomputer.com/news/microsoft/microsoft-disables-msix-protocol-handler-abused-in-malware-attacks/ No Types Assigned
https://www.bleepingcomputer.com/news/microsoft/microsoft-disables-msix-protocol-handler-abused-in-malware-attacks/ Press/Media Coverage, Third Party Advisory
Changed
Reference Type
https://www.microsoft.com/en-us/security/blog/2023/12/28/financially-motivated-threat-actors-misusing-app-installer/ No Types Assigned
<p>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.</p>
<p>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 configu
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 hav
CVE Modified by Microsoft Corporation5/14/2024 5:35:10 AM
Action
Type
Old Value
New Value
CVE Modified by Microsoft Corporation12/30/2023 2:15:08 AM
Action
Type
Old Value
New Value
Added
Reference
Microsoft Corporation https://github.com/ChrisTitusTech/winutil/pull/26 [No types assigned]
Added
Reference
Microsoft Corporation https://thehackernews.com/2023/12/microsoft-disables-msix-app-installer.html [No types assigned]
Added
Reference
Microsoft Corporation https://www.bleepingcomputer.com/news/microsoft/microsoft-disables-msix-protocol-handler-abused-in-malware-attacks/ [No types assigned]
Added
Reference
Microsoft Corporation https://www.microsoft.com/en-us/security/blog/2023/12/28/financially-motivated-threat-actors-misusing-app-installer/ [No types assigned]
CVE Modified by Microsoft Corporation12/27/2023 7:15:12 PM
<p>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.</p>
<p>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 configu
CWE Remap by NIST7/12/2022 1:42:04 PM
Action
Type
Old Value
New Value
Changed
CWE
CWE-290
NVD-CWE-noinfo
Modified Analysis by NIST1/01/2022 12:49:22 PM
Action
Type
Old Value
New Value
CVE Modified by Microsoft Corporation12/29/2021 6:15:12 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
Microsoft Corporation AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Initial Analysis by NIST12/23/2021 9:23:17 AM
Action
Type
Old Value
New Value
Added
CPE Configuration
AND
OR
*cpe:2.3:a:microsoft:app_installer:*:*:*:*:*:*:*:*
OR
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:x86:*
Added
CVSS V2
NIST (AV:N/AC:M/Au:S/C:P/I:P/A:P)
Added
CVSS V2 Metadata
Victim must voluntarily interact with attack mechanism
Added
CVSS V3.1
NIST AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Added
CWE
NIST CWE-290
Changed
Reference Type
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43890 No Types Assigned