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high advisory

Insyde UEFI Firmware Vulnerability Allows Code Execution

A local attacker can exploit a vulnerability in Insyde UEFI Firmware to execute arbitrary program code, potentially leading to privilege escalation and system compromise.

A vulnerability exists within Insyde UEFI Firmware that allows a local attacker to execute arbitrary code. The specific details of the vulnerability and exploitation method are not provided in the source. However, successful exploitation could lead to a complete compromise of the affected system. Defenders should focus on detecting suspicious process executions originating from the UEFI environment. The advisory lacks specific version information or CVE identifiers, requiring broad detection strategies.

Attack Chain

  1. Attacker gains local access to the target system.
  2. Attacker identifies a vulnerable Insyde UEFI Firmware version.
  3. Attacker leverages the vulnerability to inject malicious code into the UEFI environment. The specific injection method is not detailed in the source, but might involve exploiting a flaw in the firmware update process, or manipulating specific UEFI variables.
  4. The injected code is executed during system boot or runtime.
  5. The malicious code gains elevated privileges within the system.
  6. Attacker uses the elevated privileges to install malware or modify system settings.
  7. Attacker achieves persistent access to the system even after reboots.
  8. The final objective is arbitrary code execution, which can lead to data theft, system corruption, or complete system takeover.

Impact

Successful exploitation of this vulnerability allows a local attacker to execute arbitrary code within the UEFI environment, gaining complete control over the compromised system. This could result in sensitive data being stolen, the operating system being tampered with, or the device being rendered unusable. The advisory does not specify the number of affected systems or sectors.

Recommendation

  • Monitor process creation events for unusual processes executing from UEFI-related paths using the “Detect Suspicious UEFI Process Execution” Sigma rule.
  • Audit UEFI firmware update processes for anomalies.
  • Regularly check for updated UEFI firmware releases from Insyde and apply them promptly.

Detection coverage 2

Detect Suspicious UEFI Process Execution

high

Detects suspicious process executions originating from the UEFI environment, which could indicate exploitation of the Insyde UEFI firmware vulnerability.

sigma tactics: execution, privilege_escalation techniques: T1053.005 sources: process_creation, windows

Detect UEFI Variable Modification via efibootmgr

medium

Detects the use of efibootmgr to modify UEFI boot variables, which could indicate an attempt to persist malware or alter boot behavior.

sigma tactics: persistence techniques: T1547.006 sources: process_creation, linux

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