EXPLOITING EMBEDDED SYSTEMS THE SEQUEL!
Exploitation - CanSecWest
Exploitation - CanSecWest
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Defeating the Watchdog• Software based timers – write to watchdog register orbyte patch firmware to disable check (trap vector 0 tofind)• Hardware based timers – lift pin to prevent resetsignal being sent• Sometimes watchdog can be disabled via serialinterfaceWith the watchdog disabled you can debug freelyCopyright © 2007 Juniper Networks, Inc. Proprietary and Confidential www.juniper.net 17