Synopsis
While working with Rockwell Automation's 1756-EWEB, Tenable discovered an unauthenticated remote attacker could trigger a denial of service condition in the SNMP service by sending a zero length SNMP packet to the device. Note that the control functionality of the device is unaffected. This vulnerability can easily be recreated using hping3:
hping3 -2 -p 161
Solution
Follow Rockwell Automation's suggested actions in their advisory.Disclosure Timeline
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