Overview
The CVE-2024-52879 vulnerability exposes certain versions of Insyde InsydeH2O kernel to potential system compromise or data leakage. The issue arises from a buffer over-read in the VariableRuntimeDxe driver, specifically in the SmmUpdateVariablePropertySmi function. This vulnerability is of significant concern to users and systems utilizing the affected Insyde InsydeH2O kernel versions due to the severity of threats it poses.
Vulnerability Summary
CVE ID: CVE-2024-52879
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
InsydeH2O Kernel | 5.2 before version 05.29.50
InsydeH2O Kernel | 5.3 before version 05.38.50
InsydeH2O Kernel | 5.4 before version 05.46.50
InsydeH2O Kernel | 5.5 before version 05.54.50
InsydeH2O Kernel | 5.6 before version 05.61.50
InsydeH2O Kernel | 5.7 before version 05.70.50
How the Exploit Works
The vulnerability is in the SmmUpdateVariablePropertySmi function of the VariableRuntimeDxe driver. This function uses the StrCmp function to compare variable names, which can cause a buffer over-read. An attacker can exploit this issue by sending a specially crafted request that triggers the buffer over-read, potentially leading to system compromise or data leakage.
Conceptual Example Code
While a specific example is not provided, the following pseudocode can serve as a conceptual illustration of how the vulnerability might be exploited:
// Pseudocode
char* malicious_variable = "long_string_that_causes_buffer_overread";
char* existing_variable = "existing_variable_name";
int result = StrCmp(existing_variable, malicious_variable);
if (result == 0) {
// Buffer over-read occurs here
}The malicious_variable string would be crafted to cause the buffer over-read, leading to the potential system compromise or data leakage.
