An elevation of privilege vulnerability exists when the Windows AppX Deployment Extensions improperly performs privilege management, resulting in access to system files.To exploit this vulnerability, an authenticated attacker would need to run a specially crafted application to elevate privileges.The security update addresses the vulnerability by correcting how AppX Deployment Extensions manages privileges., aka Windows AppX Deployment Extensions Elevation of Privilege Vulnerability.
Weakness
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Windows_10_1709 | Microsoft | - (including) | - (including) |
| Windows_10_1803 | Microsoft | - (including) | - (including) |
| Windows_10_1809 | Microsoft | - (including) | - (including) |
| Windows_10_1903 | Microsoft | - (including) | - (including) |
| Windows_server_2016 | Microsoft | - (including) | - (including) |
| Windows_server_2019 | Microsoft | - (including) | - (including) |
Potential Mitigations
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/132.html
- https://cwe.mitre.org/data/definitions/17.html
- https://cwe.mitre.org/data/definitions/35.html
- https://cwe.mitre.org/data/definitions/76.html
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1385
- https://www.zerodayinitiative.com/advisories/ZDI-19-979/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1385
- https://www.zerodayinitiative.com/advisories/ZDI-19-979/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-1385