BYPASS BIOS PASSWORD LENOVO DRIVERS
BYPASS BIOS PASSWORD LENOVO DRIVER
BYPASS BIOS PASSWORD LENOVO SOFTWARE

In particular a call will be made to the function gEfiHiiDatabaseProtocolInterface->NewPackageList which allows to register the database strings with a handle. Once the header is found, it is possible to find the initialization of this database. The header follows the EFI_HII_STRING_PACKAGE_HDR structure which contains, in particular, the StringInfoOffset field indicating the start of the string. Before all those strings, a header is present. This value indicates that this element of the HII database is a string. The strings found in databases can be easily identified: they are UTF-16 strings preceded by one byte with the value 0x14. This basically means that it is not possible to directly use an xref on the string when reversing. In particular the EFI_HII_STRING_PROTOCOL allows to retrieve strings from a 'Database' using a StringId which is a simple number. In UEFI, interfacing with the user is made using the Human Interface Infrastructure (HII): a set of interfaces which allow to print and get value from the user.

BYPASS BIOS PASSWORD LENOVO DRIVER

The one I started to look at was LenovoSetupSecurityDxe since this driver appears to concentrate most of the code which allows to set and remove passwords using the user interface.

BYPASS BIOS PASSWORD LENOVO DRIVERS

A few drivers in the firmware were containing reference to strings 'passwords'. Lenovo ThinkPad firmware proposes several kinds of passwords, initially the one I was interested in was the one protecting the BIOS settings interface. No vulnerability has been identified (yet) in the management of those passwords, but without further ado let's get started. We will start by looking at how the reverse was started and the different kinds of passwords in the firmware, before having a more in depth look at two of them: the Power-On Password and the Bios Passwords. In this blogpost the goal is to explain how I started looking at the Lenovo password. The handling of passwords is specific to each constructor, which means the code explained here is specific to Lenovo and more precisely to a few ThinkPad (this is mostly common to three different ThinkPad versions, so most of this will probably stay the same).

BYPASS BIOS PASSWORD LENOVO SOFTWARE

A few publications exist 1 2 3, but I was interested to look at it from a software point of view and was not actually sure it was the same implementation (in practice it is the same). At that time I got curious about how the UEFI passwords, which in particular are used to protect the BIOS interface, are handled. In the 2010's many laptops came with a boot to BIOS/setup button, a Tiny button typically on side of the laptop meant to help you bypass this rapid boot feature and ensure you get into the BIOS, I don't see that button on any of my HP laptops, and I'm assuming it's 'hold' the Fn key down if you have fast boot enabled.In my last blogpost I spoke about a vulnerability in the System Management Mode (SMM) code of my Lenovo ThinkPad. I've had units where it took like 30 tries to finally hit it fast enough to get my input into the BIOS before the bootloader took over.Дon't recall if I ever just tried holding the key down. These two things likely go together - your rapid pressing of the Fn key wasn't fast enough. I don't know Windows at all, but wasn't there like a fast boot option that you had to shut it down a specific way to bypass? Is that still a thing? Laptops with an said in Lenovo Bypass BIOS Options: This particular laptop prefer for you to hold down the F key. For some reason, continuing to tap of the F# key for results wasn't working. Gentlemen thank you for all of your help.

Bypass bios password lenovo