Session Hijacking Attack

  IT Threats   -  

Also known as man in the middle attacks, session hijacking deceives a server or a client into accepting the upstream host as the actual legitimate host. Instead the upstream host is an attacker’s host that is manipulating the network so the attacker’s host appears to be the desired destination.

Session hijacking is a method of taking over a Web user session by surreptitiously obtaining the session ID and masquerading as the authorized user. Once the user’s session ID has been accessed (through session prediction), the attacker can masquerade as that user and do anything the user is authorized to do on the network.

Virtual private networks (VPNs) allow secure access to corporate resources by establishing an encrypted tunnel across the Internet. The ubiquity of the Internet, combined with the VPN technologies of today, allows organizations to cost-effectively and securely extend the reach of their networks to anyone, anyplace, anytime.

IPSec is a framework of open standards developed by the Internet Engineering Task Force (IETF) that provides security for transmission of sensitive information over unprotected networks such as the Internet. IPSec acts at the network layer, protecting and authenticating IP packets between participating IPSec devices (“peers”) such as Cisco routers.

IPsec is designed to provide interoperable, high-quality, and cryptographically based security. IPsec is defined in (RFC 2401). The set of security services offered includes access control, connectionless integrity, data origin authentication, protection against replays, confidentiality (encryption), and limited traffic flow confidentiality. These services are provided at the IP layer, offering protection for IP and upper-layer protocols (ULPs). Because these services are provided at the IP layer, they can be used by any higher-layer protocol (for example TCP, User Datagram Protocol [UDP], and Border Gateway Protocol [BGP]).

IPsec provides security services at the IP layer by enabling a system to select required security protocols, determine the algorithm (or algorithms) to use for the service (or services), and put in place any cryptographic keys required to provide the requested services. IPsec can be used to protect one or more paths between a pair of hosts, between a pair of security gateways, or between a security gateway and a host.


Configure authentication and integrity checking between VPN endpoints.