Researchers have identified malicious code actively exploiting a one-year-old firmware vulnerability known as LogoFAIL, targeting Linux devices from manufacturers like Acer, HP, Fujitsu, and Lenovo. This vulnerability allows attackers to bypass Secure Boot, thereby executing malicious firmware early in the boot process. The existence of this exploit, which was previously theoretical, suggests a significant advancement in potential attacks.
The exploit allows the installation of Bootkitty, a backdoor established in Linux systems by injecting malicious code into the UEFI firmware, crucial for booting modern devices. Typically, Secure Boot safeguards devices by validating the digital signatures of files, but the LogoFAIL exploit bypasses this protection. It utilizes a malicious bitmap image displayed during boot to inject code that tricks the UEFI into recognizing a backdoored GRUB file and Linux kernel as trusted components.
Despite no current evidence of this exploit being actively used, its polished nature indicates it could become a significant threat in the near future. The vulnerabilities are mainly present in devices equipped with a specific UEFI developed by Insyde, and while some models have received a patch, many remain vulnerable if unaddressed.
The situation raises concerns about the susceptibility of devices to these attacks, particularly as user interaction is not required for the exploit to take place. The malicious payload is cleverly disguised, often showing an innocuous image that does not arouse suspicion. Security experts recommend ensuring that all devices with Insyde UEFIs are updated to mitigate potential threats stemming from this vulnerability.
More information can be found on the advisories for the vulnerabilities tracked as CVE-2023-40238 and CVE-2023-39538.
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