Researchers Uncover UEFI Safe Boot Bypass in 3 Microsoft Signed Boot Loaders

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boot loaders

A safety characteristic bypass vulnerability has been found in three signed third-party Unified Extensible Firmware Interface (UEFI) bootloaders that permit the UEFI Safe Boot characteristic to be bypassed.

“These vulnerabilities could be exploited by mounting the system partition EFI and changing the present bootloader with the susceptible one, or by modifying a UEFI variable to load the susceptible bootloader as an alternative of the present one,” {hardware} safety agency Eclypsium mentioned in a report. shared with The Hacker Information.

cyber security

The next vendor-specific bootloaders, which have been signed and authenticated by Microsoft, have been discovered susceptible to bypass and have been patched as a part of the tech big’s Patch Tuesday replace launched this week:

Safe Boot is a safety commonplace designed to stop malicious packages from loading when a pc begins (boots) and ensures that solely software program trusted by the unique gear producer (OEM) begins.

boot loaders

In different phrases, profitable exploitation of the issues may permit an adversary to bypass safety measures at startup and execute arbitrary unsigned code throughout the boot course of.

This may have extra negative effects, permitting a nasty actor to realize rooted entry and set up persistence on a number in a means that may survive working system reinstalls and onerous drive replacements, to not point out fully bypassing the detection of safety software program.

cyber security

Calling CVE-2022-34302 “a lot stealthier,” Eclypsium famous that the New Horizon Datasys vulnerability just isn’t solely trivial to use within the wild, however may also “permit much more advanced evasions, reminiscent of disabling safety drivers.”

Safety drivers, for instance, can embrace Trusted Platform Module (TPM) measurements and signature checks, mentioned Eclypsium researchers Mickey Shkatov and Jesse Michael.

It’s value noting that exploiting these vulnerabilities requires an attacker to have administrator privileges, though acquiring native privilege escalation just isn’t insurmountable.

“Like BootHole, these vulnerabilities spotlight the challenges of making certain the boot integrity of units that depend on a posh provide chain of distributors and code working collectively,” the researchers concluded, including that “these points spotlight how Easy vulnerabilities in third-party code can undermine your complete course of.”


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Researchers Uncover UEFI Secure Boot Bypass in 3 Microsoft Signed Boot Loaders