Browse Definitions :
Definition

BIOS attack

What is a BIOS attack?

A BIOS attack is an exploit that infects the BIOS with malicious code and is persistent through reboots and attempts to reflash the firmware.

The BIOS is the firmware that runs while a computer boots up. Originally, it was hard-coded and read-only (which was why it was called firmware). Manufacturers now use an erasable format, such as flash memory, to make BIOS updates easier. As an unintended result, however, the change also means that the BIOS is vulnerable to online attack.

A BIOS attack does not require any vulnerability on the target system. Once an attacker gains administrative-level privileges through some other mechanism, he can flash the BIOS over the Internet with malware-laden firmware. A BIOS attack could infect a decompression routine used in the majority of motherboards.

It was once thought that BIOS malware would have to be written specifically for each of the many different BIOS implementations. However, at the 2009 CanSecWest security conference, researchers Alfredo Ortega and Anibal Sacco demonstrated a generic BIOS attack that would enable full control of the underlying firmware, regardless of the operating system. That ability means that such an attack could be widespread and portable among platforms.

There are two methods of preventing BIOS infection. The first method involves physically setting the BIOS to make it non-writeable. The second method relies on a hardware cryptographic key burned into the BIOS chip at manufacture that can be used to verify that the code has not been modified.

Learn More About IT:
> Sherri Davidoff writes about what happens 'When BIOS updates turn into attacks.'
> Dennis Fisher reported 'Researchers unveil persistent BIOS attack methods.'

This was last updated in July 2009

Join the conversation

1 comment

Send me notifications when other members comment.

Please create a username to comment.

hi
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

SearchCompliance

  • PCI DSS (Payment Card Industry Data Security Standard)

    The Payment Card Industry Data Security Standard (PCI DSS) is a widely accepted set of policies and procedures intended to ...

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

  • compliance framework

    A compliance framework is a structured set of guidelines that details an organization's processes for maintaining accordance with...

SearchSecurity

  • Trojan horse (computing)

    In computing, a Trojan horse is a program downloaded and installed on a computer that appears harmless, but is, in fact, ...

  • identity theft

    Identity theft, also known as identity fraud, is a crime in which an imposter obtains key pieces of personally identifiable ...

  • DNS over HTTPS (DoH)

    DNS over HTTPS (DoH) is a relatively new protocol that encrypts domain name system traffic by passing DNS queries through a ...

SearchHealthIT

  • telemedicine (telehealth)

    Telemedicine is the remote delivery of healthcare services, such as health assessments or consultations, over the ...

  • Project Nightingale

    Project Nightingale is a controversial partnership between Google and Ascension, the second largest health system in the United ...

  • medical practice management (MPM) software

    Medical practice management (MPM) software is a collection of computerized services used by healthcare professionals and ...

SearchDisasterRecovery

SearchStorage

  • M.2 SSD

    An M.2 SSD is a solid-state drive (SSD) that conforms to a computer industry specification and is used in internally mounted ...

  • kilobyte (KB or Kbyte)

    A kilobyte (KB or Kbyte) is a unit of measurement for computer memory or data storage used by mathematics and computer science ...

  • virtual memory

    Virtual memory is a memory management capability of an operating system (OS) that uses hardware and software to allow a computer ...

Close