Reverse Engineering

UEFI_RETool – A Tool For UEFI Firmware Reverse Engineering

August 23, 2020
2 Min Read
UEFI_RETool - A Tool For UEFI Firmware Reverse Engineering

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A tool for UEFI firmware reverse engineering.

UEFI firmware analysis with uefi_retool.py script
Usage:

  • Copy ida_plugin/uefi_analyser.py script and ida_plugin/uefi_analyser directory to IDA plugins directory
  • Edit config.json file
    • PE_DIR is a directory that contains all executable images from the UEFI firmware
    • DUMP_DIR is a directory that contains all components from the firmware filesystem
    • LOGS_DIR is a directory for logs
    • IDA_PATH and IDA64_PATH are paths to IDA Pro executable files
  • Run pip install -r requirements.txt
  • Run python uefi_retool.py command to display the help message

Commands

python uefi_retool.py
Usage: uefi_retool.py [OPTIONS] COMMAND [ARGS]...
Options:
--help Show this message and exit.
Commands:
get-images Get executable images from UEFI firmware.
get-info Analyze the entire UEFI firmware.
get-pp Get a list of proprietary protocols in the UEFI firmware.

get-images

python uefi_retool.py get-images --help
Usage: uefi_retool.py get-images [OPTIONS] FIRMWARE_PATH
Get executable images from UEFI firmware. Images are stored in "modules"
directory.
Options:
--help Show this message and exit.

Example:

python uefi_retool.py get-images test_fw/fw-tp-x1-carbon-5th.bin

get-info

python uefi_retool.py get-info --help
Usage: uefi_retool.py get-info [OPTIONS] FIRMWARE_PATH
Analyze the entire UEFI firmware. The analysis result is saved to .json
file.
Options:
-w, --workers INTEGER Number of workers (8 by default).
--help Show this message and exit.

Example:

python uefi_retool.py get-info -w 6 test_fw/fw-tp-x1-carbon-5th.bin

get-pp

python uefi_retool.py get-pp --help
Usage: uefi_retool.py get-pp [OPTIONS] FIRMWARE_PATH
Get a list of proprietary protocols in the UEFI firmware. The result is
saved to .json file.

Options:
-w, --workers INTEGER Number of workers (8 by default).
--help Show this message and exit.

Example:

python uefi_retool.py get-pp -w 6 test_fw/fw-tp-x1-carbon-5th.bin

Additional tools

  • tools/update_edk2_guids.py is a script that updates protocol GUIDs list from edk2 project

IDA plugin
IDA plugin for UEFI analysis

Analyser & Protocol explorer

Usage

  • Copy uefi_analyser and uefi_analyser.py to your %IDA_DIR%/plugins directory
  • Open the executable UEFI image in IDA and go to Edit -> Plugins -> UEFI analyser (alternatively, you can use the key combination Ctrl+Alt+U)

Example

Before analysis

After analysis

Protocol explorer window

Dependency browser & Dependency graph

Usage

  • Analyse the firmware using uefi_retool.py 
    python uefi_retool.py get-info FIRMWARE_PATH
  • Load <LOGS_DIR>/<FIRMWARE_NAME>-all-info.json file to IDA (File -> UEFI_RETool...)

    alternatively, you can use the key combination Ctrl+Alt+J)

Example

Dependency browser window

Dependency graph

Similar works


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