Windows Installer 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_1507 | Microsoft | * | 10.0.10240.19119 (excluding) |
| Windows_10_1607 | Microsoft | * | 10.0.14393.4770 (excluding) |
| Windows_10_1809 | Microsoft | * | 10.0.17763.2300 (excluding) |
| Windows_10_1909 | Microsoft | * | 10.0.18363.1916 (excluding) |
| Windows_10_2004 | Microsoft | * | 10.0.19041.1348 (excluding) |
| Windows_10_20h2 | Microsoft | * | 10.0.19042.1348 (excluding) |
| Windows_10_21h1 | Microsoft | * | 10.0.19043.1348 (excluding) |
| Windows_11_21h2 | Microsoft | * | 10.0.22000.318 (excluding) |
| Windows_7 | Microsoft | –sp1 (including) | –sp1 (including) |
| Windows_8.1 | Microsoft | - (including) | - (including) |
| Windows_rt_8.1 | Microsoft | - (including) | - (including) |
| Windows_server_2004 | Microsoft | * | 10.0.19041.1348 (excluding) |
| Windows_server_2008 | Microsoft | –sp2 (including) | –sp2 (including) |
| Windows_server_2008 | Microsoft | r2-sp1 (including) | r2-sp1 (including) |
| Windows_server_2012 | Microsoft | - (including) | - (including) |
| Windows_server_2012 | Microsoft | r2 (including) | r2 (including) |
| Windows_server_2016 | Microsoft | * | 10.0.14393.4770 (excluding) |
| Windows_server_2019 | Microsoft | * | 10.0.17763.2300 (excluding) |
| Windows_server_2022 | Microsoft | * | 10.0.20348.350 (excluding) |
| Windows_server_20h2 | Microsoft | * | 10.0.19042.1348 (excluding) |
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-2021-41379
- https://www.zerodayinitiative.com/advisories/ZDI-21-1308/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41379
- https://www.zerodayinitiative.com/advisories/ZDI-21-1308/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-41379