Context: Following the Indian government’s temporary block on Telegram, the platform’s founder and CEO Pavel Durov claimed that the app’s global access was being compromised via BGP hijacking.
About BGP Hijacking:
What It Is?
- Border Gateway Protocol (BGP) hijacking is an advanced cyber-tactical event in which internet traffic is maliciously or accidentally misdirected. This happens when a network operator falsely advertises IP address space that it does not own, confusing the internet’s global routing directory.
How It Works?
- The Internet’s Post Office: The global internet is partitioned into thousands of massive, independent network blocks called Autonomous Systems (AS) run by telecom operators, ISPs, and cloud providers. Each AS uses BGP to announce which IP addresses it can reach.
- The Trust Variable: The core infrastructure of the internet relies on implicit trust; networks generally accept these BGP routing paths as accurate reflections of the best map routes.
- The False Advertisement: During a hijack, a rogue or misconfigured Autonomous System broadcasts a fraudulent routing announcement claiming it has the shortest, most efficient path to a target service’s IP addresses.
- Traffic Diversion: Upstream transit networks accept this false map entry, updating the global routing table. Consequently, traffic meant for the legitimate service is pulled away and channeled into the rogue network instead.
Key Technical Features:
- Route Aggressive Preference: BGP naturally prioritizes the most specific IP prefixes or the shortest network paths. Attackers exploit this behavior by making highly specific false announcements that force external networks to prefer their rogue route over legitimate options.
- Traffic Blackholing: Once traffic is successfully pulled into the rogue network, the operator can drop the packets entirely. This drops the data into an operational void, causing an immediate denial of service (DoS) for users.
- Man-in-the-Middle (MitM) Capacity: Instead of destroying the diverted traffic, a malicious operator can secretly inspect, log, or manipulate the data before forwarding it to the actual destination, executing silent surveillance.
- Cascading Global Propagation: Because Autonomous Systems continually share routing tables with each other, a single false entry made in one region can ripple across global carrier networks within minutes, disrupting users worldwide.
Implications:
- BGP hijacking can redirect internet traffic across borders, causing unintended disruptions and creating opportunities for cyber conflicts.
- Even minor routing errors can disconnect major websites and applications, leading to widespread digital service failures.
- Rerouted traffic may expose unencrypted data to interception, increasing risks of espionage, credential theft, and privacy breaches.
