Firmware

Source: Wikipedia, the free encyclopedia.
Firmware is commonly stored in an EEPROM or Flash memory,[1] which makes use of an I/O protocol such as SPI.

In

computing device hardware
. For a relatively simple device, firmware may perform all control, monitoring and data manipulation functionality. For a more complex device, firmware may provide relatively low-level control as well as hardware abstraction services to higher-level software such as an operating system.

Firmware is found in a wide range of computing devices including

computer peripherals and in many of the integrated circuits
inside each of these larger systems.

Firmware is stored in

flashing.[2]

Common reasons for

features
.

History and etymology

Ascher Opler used the term

instruction sets could be customized, with different firmware loaded for different instruction sets.[3]

As computers began to increase in complexity, it became clear that various programs needed to first be initiated and run to provide a consistent environment necessary for running more complex programs at the user's discretion. This required programming the computer to run those programs automatically. Furthermore, as companies, universities, and marketers wanted to sell computers to laypeople with little technical knowledge, greater automation became necessary to allow a lay-user to easily run programs for practical purposes. This gave rise to a kind of software that a user would not consciously run, and it led to software that a lay user wouldn't even know about.[4]

As originally used, firmware contrasted with hardware (the CPU itself) and software (normal instructions executing on a CPU). It was not composed of CPU machine instructions, but of lower-level microcode involved in the implementation of machine instructions. It existed on the boundary between hardware and software; thus the name firmware. Over time, popular usage extended the word firmware to denote any computer program that is tightly linked to hardware, including

consumer electronic devices such as microwave ovens and remote controls
.

Applications

Computers

Baby AT motherboard

In some respects, the various firmware components are as important as the operating system in a working computer. However, unlike most modern operating systems, firmware rarely has a well-evolved automatic mechanism of updating itself to fix any functionality issues detected after shipping the unit.

A computer's firmware may be manually updated by a user via a small utility program. In contrast, firmware in mass storage devices (hard-disk drives, optical disc drives, flash memory storage e.g. solid state drive) is less frequently updated, even when flash memory (rather than ROM, EEPROM) storage is used for the firmware.

Most computer peripherals are themselves special-purpose computers. Devices such as printers, scanners, webcams, and

USB sound cards, the trend is to store the firmware in on-chip memory in the device's microcontroller, as opposed to storing it in a separate EEPROM
chip.

Examples of computer firmware include:

Updating the firmware of a Fuji Instax camera

Home and personal-use products

Consumer appliances like

firmware over the air
upgrade capability for adding new features and patching security issues.

Automobiles

Since 1996, most

automobiles have employed an on-board computer and various sensors to detect mechanical problems. As of 2010, modern vehicles also employ computer-controlled anti-lock braking systems (ABS) and computer-operated transmission control units
(TCUs). The driver can also get in-dash information while driving in this manner, such as real-time fuel economy and tire pressure readings. Local dealers can update most vehicle firmware.

Other examples

Other firmware applications include:

Flashing

Flashing[6] is a process that involves the overwriting of existing firmware or data, contained in EEPROM or flash memory module present in an electronic device, with new data.[6] This can be done to upgrade a device[7] or to change the provider of a service associated with the function of the device, such as changing from one mobile phone service provider to another or installing a new operating system. If firmware is upgradable, it is often done via a program from the provider, and will often allow the old firmware to be saved before upgrading so it can be reverted to if the process fails, or if the newer version performs worse. Free software replacements for vendor flashing tools have been developed, such as Flashrom.

Firmware hacking

Main article: Custom firmware

Sometimes, third parties develop an unofficial new or modified ("aftermarket") version of firmware to provide new features or to unlock hidden functionality; this is referred to as

portable media players. There are many homebrew projects for various devices, which often unlock general-purpose computing functionality in previously limited devices (e.g., running Doom on iPods
).

Firmware hacks usually take advantage of the firmware update facility on many devices to install or run themselves. Some, however, must resort to

unlicensed code
.

Most firmware hacks are free software.

HDD firmware hacks

The Moscow-based Kaspersky Lab discovered that a group of developers it refers to as the Equation Group has developed hard disk drive firmware modifications for various drive models, containing a trojan horse that allows data to be stored on the drive in locations that will not be erased even if the drive is formatted or wiped.[8] Although the Kaspersky Lab report did not explicitly claim that this group is part of the United States National Security Agency (NSA), evidence obtained from the code of various Equation Group software suggests that they are part of the NSA.[9][10]

Researchers from the Kaspersky Lab categorized the undertakings by Equation Group as the most advanced hacking operation ever uncovered, also documenting around 500 infections caused by the Equation Group in at least 42 countries.

Security risks

executable code".[12] Firmware should be open-source
so that the code can be checked and verified.

Custom firmware hacks have also focused on injecting

hacker convention. A USB device firmware hack called BadUSB was presented at the Black Hat USA 2014 conference,[15] demonstrating how a USB flash drive microcontroller can be reprogrammed to spoof various other device types to take control of a computer, exfiltrate data, or spy on the user.[16][17] Other security researchers have worked further on how to exploit the principles behind BadUSB,[18] releasing at the same time the source code of hacking tools that can be used to modify the behavior of different USB devices.[19]

See also

References

  1. ^ "W25X20CL Datasheet". Winbond. Retrieved 2024-08-30.
  2. ^ "What is firmware?". 23 January 2013.
  3. ^ Opler, Ascher (January 1967). "Fourth-Generation Software". Datamation. 13 (1): 22–24.
  4. ^ "Introduction to Computer Applications and Concepts. Module 3: System Software". Lumen.
  5. ^ Mielewczik, Michael (2000). "Firmware-Update. Mehr Speed und Sicherheit". PC Praxis (in German). 1/2000: 68.
  6. ^ a b "Flashing Firmware". Tech-Faq.com. Archived from the original on September 27, 2011. Retrieved July 8, 2011.
  7. ^ "HTC Developer Center". HTC. Archived from the original on April 26, 2011. Retrieved July 8, 2011.
  8. ^ "Equation Group: The Crown Creator of Cyber-Espionage". Kaspersky Lab. February 16, 2015. Archived from the original on December 2, 2015.
  9. ^ Dan Goodin (February 2015). "How "omnipotent" hackers tied to NSA hid for 14 years—and were found at last". Ars Technica. Archived from the original on 2016-04-24.
  10. ^ "Breaking: Kaspersky Exposes NSA's Worldwide, Backdoor Hacking of Virtually All Hard-Drive Firmware". Daily Kos. February 17, 2015. Archived from the original on February 25, 2015.
  11. ^ "Shuttleworth Calls for Declarative Firmware". Linux Magazine. No. 162. May 2014. p. 9.
  12. ^ Shuttleworth, Mark (March 17, 2014). "ACPI, firmware and your security". Archived from the original on March 15, 2015.
  13. ^ "MalCon 2010 Technical Briefings". Malcon.org. Archived from the original on 2011-07-04.
  14. ^ "Hacker plants back door in Symbian firmware". H-online.com. 2010-12-08. Archived from the original on 21 May 2013. Retrieved 2013-06-14.
  15. ^ "Why the Security of USB Is Fundamentally Broken". Wired.com. 2014-07-31. Archived from the original on 2014-08-03. Retrieved 2014-08-04.
  16. ^ "BadUSB - On Accessories that Turn Evil". BlackHat.com. Archived from the original on 2014-08-08. Retrieved 2014-08-06.
  17. ^ Karsten Nohl; Sascha Krißler; Jakob Lell (2014-08-07). "BadUSB – On accessories that turn evil" (PDF). srlabs.de. Archived (PDF) from the original on 2016-10-19. Retrieved 2014-08-23.
  18. ^ "BadUSB Malware Released — Infect millions of USB Drives". The Hacking Post. Archived from the original on 6 October 2014. Retrieved 7 October 2014.
  19. ^ Greenberg, Andy. "The Unpatchable Malware That Infects USBs Is Now on the Loose". WIRED. Archived from the original on 7 October 2014. Retrieved 7 October 2014.
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