Overview
This report examines the details of CVE-2024-55567, a serious vulnerability found in the Insyde InsydeH2O kernel. This vulnerability affects several versions of the kernel and poses a significant risk due to the potential for system compromise or data leakage. It is of particular concern to organizations using affected versions of the kernel, as exploitation could lead to unauthorized access and control of system resources.
Vulnerability Summary
CVE ID: CVE-2024-55567
Severity: High (CVSS: 7.5)
Attack Vector: Local
Privileges Required: Low
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Insyde InsydeH2O Kernel | 5.4 before 05.47.01
Insyde InsydeH2O Kernel | 5.5 before 05.55.01
Insyde InsydeH2O Kernel | 5.6 before 05.62.01
Insyde InsydeH2O Kernel | 5.7 before 05.71.01
How the Exploit Works
The vulnerability lies in the improper input validation in UsbCoreDxe in the InsydeH2O kernel. An attacker could exploit this vulnerability by triggering a specific SMM (System Management Mode) call out. This could allow the attacker to write arbitrary memory inside SMRAM (System Management RAM) and execute arbitrary code at the SMM level, leading to potential system compromise or data leakage.
Conceptual Example Code
While the specific exploitation code will depend on the attacker’s objectives and the system’s configuration, a conceptual example might look like this:
# Conceptual Python code showing how to exploit the vulnerability
import smm
def exploit(target_smm):
# Create arbitrary memory and code
arbitrary_memory = smm.Memory("...")
arbitrary_code = smm.Code("...")
# Write arbitrary memory inside SMRAM
target_smm.write_memory(arbitrary_memory)
# Execute arbitrary code at SMM level
target_smm.execute_code(arbitrary_code)
# Target the vulnerable SMM
target_smm = smm.get_smm("target")
exploit(target_smm)Note: This is a conceptual example and may not reflect the exact methods used in a real-world exploit of this vulnerability. It is meant to illustrate the potential method of exploitation rather than provide a specific exploit script.
