Virtual Local Area Network Hopping (VLAN Hopping)
Definition - What does Virtual Local Area Network Hopping (VLAN Hopping) mean?
Techopedia explains Virtual Local Area Network Hopping (VLAN Hopping)
There are two methods of attack. The first exploits autotrunking, although this is not available or activated on all switches. The attacker makes the trunk switch constantly, providing access to all VLANs allowed on the trunk port and allowing the attacker to choose one. This is called switch spoofing.
The second method involves sending data frames with the 802.1Q tags to two switches - the attacking switch and victim switch. The victim switch is tricked into behaving as if the frame is intended for it and then sends it along to the other VLANs. When the attacker gains access to the VLAN, he is able to do almost anything - as if he were at the terminal - such as copying/deleting files, uploading viruses, installing other applications or even changing settings.
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