CodeJitsu targetted CSDS running CROMU_00065 in round 83.

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Type 1 POV

eip:0xac42aec6 - ebx:0x44a22eea

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Execution control corruption via call.

Tracing data from eip: 0x8049796 tracing source of register: eax (value: 0xbaaaae6a)

0x804d401 : receive syscall (return)
0x804a342 : mov al,byte ptr [ebp-0x21]
0x804a34b : mov byte ptr [edx+ecx],al
0x8049772 : mov eax,dword ptr [ecx+0xc]
0x8049796: call eax // address: eax value: 0xbaaaae6a

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Execution of memory occurred that was not part of the initial text sections or an executably allocated page.

Tracing data from eip: 0xbaaaae6a tracing source of memory: 0xbaaaae6a (value: 0xa22eeabb)

0x804d401 : receive syscall (return)
0x804a342 : mov al,byte ptr [ebp-0x21]
0x804a34b : mov byte ptr [edx+ecx],al
0xbaaaae6a: mov ebx,0x44a22eea // address: 0xbaaaae6a value: 0xa22eeabb

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Negotiated general register: ebx:0x44a22eea

Tracing data from eip: 0xbaaaae74 tracing source of register: ebx (value: 0x44a22eea)

0xbaaaae6a : mov ebx,0x44a22eea
0xbaaaae74: jmp eax // address: ebx value: 0x44a22eea