CodeJitsu targetted Shellphish running CROMU_00065 in round 94.

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Type 1 POV

eip:0x2aea2004 - ebx:0x80e6624

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Execution control corruption via call.

Tracing data from eip: 0x80496a3 tracing source of register: edx (value: 0xbaaaae69)

0x804d401 : receive syscall (return)
0x804a342 : mov al,byte ptr [ebp-0x21]
0x804a34b : mov byte ptr [edx+ecx],al
0x8049690 : mov edx,dword ptr [ecx+eax+0xc]
0x80496a3: call edx // address: edx value: 0xbaaaae69

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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: 0xbaaaae69 tracing source of memory: 0xbaaaae69 (value: 0xe6624bb)

0x804d401 : receive syscall (return)
0x804a342 : mov al,byte ptr [ebp-0x21]
0x804a34b : mov byte ptr [edx+ecx],al
0xbaaaae69: mov ebx,0x80e6624 // address: 0xbaaaae69 value: 0xe6624bb

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Negotiated general register: ebx:0x80e6624

Tracing data from eip: 0xbaaaae73 tracing source of register: ebx (value: 0x80e6624)

0xbaaaae69 : mov ebx,0x80e6624
0xbaaaae73: jmp eax // address: ebx value: 0x80e6624