SYSTEM code execution via unsigned dependency loading
Published Apr 14, 2020 · Updated Sep 16, 2024
Improper signature verification in Lenovo System Interface Foundation before 1.2.184.31 allows local users to execute unsigned DLL code as SYSTEM. The LenovoAppScenarioPluginSystem plugin loads TouchScreenContronlDLL.dll through DllImport without verifying that the dependency carries a Lenovo signature. A low-privileged user must place a crafted DLL through the plugin-update path and invoke Get-TouchScreenState, after which the service loads the code in its SYSTEM context.
Summary
What happened
Improper signature verification in Lenovo System Interface Foundation before 1.2.184.31 allows local users to execute unsigned DLL code as SYSTEM. The LenovoAppScenarioPluginSystem plugin loads TouchScreenContronlDLL.dll through DllImport without verifying that the dependency carries a Lenovo signature. A low-privileged user must place a crafted DLL through the plugin-update path and invoke Get-TouchScreenState, after which the service loads the code in its SYSTEM context.
The record
- CVE
- CVE-2020-8324
- Published
- Apr 14, 2020
- Updated
- Sep 16, 2024
- Vendor
- Lenovo
- Product
- LenovoAppScenarioPluginSystem for Lenovo System Interface Foundation
- Classifications
- CWE-347, T1574.002
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 14, 2020CVE publishedPublication date reported by the CVE source.
- Sep 16, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <1.2.184.31
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- PrivEsc in Lenovo Vantage. Two minutes laterfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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