Definition
A backdoor is an undocumented method of bypassing normal authentication and encryption mechanisms to gain unauthorized access to a target system.
Some attackers use malware to create backdoors, while some device and software manufacturers create secret backdoors to retain access in critical times. Attackers who use backdoors can infiltrate systems without detection and are treated like regular users.
Real Backdoor Examples
- 2005: Soly BGB issued CDS containing rootkits that prevented the disk’s piracy. It was later discovered that the rootkits created backdoors on user devices.
- 2014: SerComm was accused of adding secret backdoors to their assembled Linksys and Netgear routers.
- 2014: Samsung devices were discovered to have a backdoor.
Preventing a Backdoor Attack
- Keep your operating system and applications up to date: Updating your software fixes existing vulnerabilities that can be exploited to create backdoors.
- Stay informed about exposed backdoors: Avoid all devices with known backdoors and those with vulnerabilities until they are patched.
- Use a robust antivirus system: A quality antivirus can reliably detect, isolate and remove viruses from your device, including those that help attackers create backdoors.