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Vulnerability of BGP: hijacking traffic

Synthesis of the vulnerability 

An attacker can change BGP routes in order to capture traffic.
Vulnerable software: BGP protocol.
Severity of this announce: 2/4.
Creation date: 28/08/2008.
Références of this computer vulnerability: VIGILANCE-VUL-8071.

Description of the vulnerability 

BGP (Border Gateway Protocol) is the main internet routing protocol.

An attacker with a BGP router can send a message to change the path in order to receive packets destined to an IP address. However, if he wishes to transmit packets to the legitimate recipient, these packets come back to him (because he is indicated as path). This old attack type is not efficient and quickly detected.

A variant was published. Indeed, if the attacker uses different network masks (1.2.3.0/24, and 1.2.3.0/26 which is more restrictive thus has a higher priority) and prepends Autonomous System numbers (via the command "route-map ... set as-prepend" of a Cisco router), the path is not propagated to some routers. The attacker then receives packets via the route for 1.2.3.0/26 and can transmit them to the legitimate recipient via the route for 1.2.3.0/24.

The attacker can thus capture data without being detected by the legitimate recipient.
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This vulnerability announce impacts software or systems such as BGP protocol.

Our Vigil@nce team determined that the severity of this cybersecurity threat is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this computer threat bulletin.

Solutions for this threat 

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