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Cisco Bug: CSCuw20424 - CAT6K:Layer 2 (L2) packet not dropped on length mismatch

Last Modified

Feb 25, 2018

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.6(1.3)S

Description (partial)

Symptom:
The Cisco Catalyst Ethernet driver fails to properly drop a Layer 2 (L2) frame that should be evaluated as invalid. 
The L2 frame will be flooded to all active ports on the associated VLAN due to a failure to match to a known Media Access 
Control (MAC) in the Cisco Access Manager (CAM) table.  This could allow the attacker to perform a traffic amplification 
attack to consume bandwidth on all ports associated with the VLAN of the receiving port.

Conditions:
Device running with default configuration running an affected version of software.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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