Overview
The cybersecurity vulnerability outlined in this report, identified as CVE-2024-52878, affects the Insyde InsydeH2O kernel versions 5.2 through 5.7. This vulnerability poses a significant threat due to its potential to enable unauthorized system compromise or data leakage. The severity and potential impact of this vulnerability underscore the importance of immediate attention and mitigation.
Vulnerability Summary
CVE ID: CVE-2024-52878
Severity: High (7.5 CVSS)
Attack Vector: Local
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Insyde InsydeH2O Kernel | 5.2 before 05.29.50
Insyde InsydeH2O Kernel | 5.3 before 05.38.50
Insyde InsydeH2O Kernel | 5.4 before 05.46.50
Insyde InsydeH2O Kernel | 5.5 before 05.54.50
Insyde InsydeH2O Kernel | 5.6 before 05.61.50
Insyde InsydeH2O Kernel | 5.7 before 05.70.50
How the Exploit Works
The vulnerability stems from the VariableServicesSetVariable () function in the VariableRuntimeDxe driver, which can be invoked by various calls. This function uses StrSize () to get the variable name size, StrLen () to get the variable name length, and StrCmp () to compare strings. These actions can lead to a buffer over-read, potentially resulting in unauthorized access or data leakage.
Conceptual Example Code
This is a conceptual example showing how an unauthorized user might exploit this vulnerability:
#include <VariableRuntimeDxe.h>
int main() {
char varName[100];
// Fill varName with overly long string
for(int i=0; i<100; i++)
varName[i] = 'A';
varName[99] = '\0';
// Call vulnerable function
gRT->SetVariable(varName, ...);
}Note: This is a conceptual example and may not directly represent actual exploit code.
Recommendations
Users are advised to apply the vendor patch as soon as available. In the interim, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could be employed for temporary mitigation.
