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Extra resources for Cisco - Vulnerabilities-The Past,The Present and The Future

Sample text

Configuration preserved ! More choices of what to do ! Disadvantages ! Depending on platform ! Router has to reboot once So what? The community gains increasing experience in exploiting IOS bugs ! IOS has still no internal protections ! Features are still added to the old code tree ! IOS still copies data into buffers that are not large enough to hold it ! Note: Others exploit IOS as well, only we do it in the public So what? Routers, IOS has the still no internal protections NSA can find and capture a lot electronic messages.

Cisco Note:routers inside-out and helps me Others exploit asare well,used only in we target do it in the understand howIOS they public networks. The future Hope? They just can‘t parse! Most of the bugs discussed are parsing related ! Research indicates that every service process on IOS does it‘s own IP packet parsing ! See yourself: ! 0xFFFFFFFF ! -1 Outlook (not Microsoft‘s) ! „Death on arrival“ bug was design related ! We may see more of these in the future ! Not all overflows are found yet !

Decoding seems to take place in the exact same buffer ! Return address HTTP encoded Return address selection ! Several address selection strategies tested ! Last address obtained (about 50% success) ! Randomly selected address (about 50%-60% success) ! Highest memory location (about 0%-10% success) ! Lowest memory location (about 90% success) ! Most frequently seen address (about 30%-40% success) Researching binary IOS ! Cisco supports serial gdb ! ROM Monitor (rommon) allows limited debugging !

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