CodeJitsu targetted TECHx running YAN01_00015 in round 62.

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Type 1 POV

eip:0x9b75325d - esp:0xf7b1d765

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Execution control corruption via return (return to: 0xbaaaaff8).

Tracing data from eip: 0x8048ba9 tracing source of memory: 0xbaaaaff8 (value: 0xbaaaaf6c)

0x804939a : receive syscall (return)
0x804909b : mov bl,byte ptr [esi+ecx]
0x804909e : mov byte ptr [ebp-0x29],bl
0x80490a1 : mov bl,byte ptr [ebp-0x29]
0x80490aa : mov byte ptr [edx+ecx],bl
0x8048ba9: ret // address: 0xbaaaaff8 value: 0xbaaaaf6c

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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: 0xbaaaaf6c tracing source of memory: 0xbaaaaf6c (value: 0xb1d765bc)

0x804939a : receive syscall (return)
0x804909b : mov bl,byte ptr [esi+ecx]
0x804909e : mov byte ptr [ebp-0x29],bl
0x80490a1 : mov bl,byte ptr [ebp-0x29]
0x80490aa : mov byte ptr [edx+ecx],bl
0xbaaaaf6c: mov esp,0xf7b1d765 // address: 0xbaaaaf6c value: 0xb1d765bc

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Negotiated general register: esp:0xf7b1d765

Tracing data from eip: 0xbaaaaf76 tracing source of register: esp (value: 0xf7b1d765)

0xbaaaaf6c : mov esp,0xf7b1d765
0xbaaaaf76: jmp ebx // address: esp value: 0xf7b1d765