Sybase SQL Blank Password

# SPDX-FileCopyrightText: 2008 Tenable Network Security
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:sybase:adaptive_server_enterprise";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.80018");
  script_version("2024-07-23T05:05:30+0000");
  script_tag(name:"last_modification", value:"2024-07-23 05:05:30 +0000 (Tue, 23 Jul 2024)");
  script_tag(name:"creation_date", value:"2008-10-24 19:51:47 +0200 (Fri, 24 Oct 2008)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_name("Sybase SQL Blank Password");
  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2008 Tenable Network Security");
  script_family("Databases");
  script_require_ports("Services/sybase", 5000);
  script_dependencies("gb_sybase_tcp_listen_detect.nasl");
  script_mandatory_keys("sybase/tcp_listener/detected");

  script_tag(name:"solution", value:"Either disable this account or set a password for it.");

  script_tag(name:"summary", value:"The remote Sybase SQL server has the default 'sa' account
  enabled without any password.");

  script_tag(name:"impact", value:"An attacker may use this flaw to execute commands against the
  remote host as well as read database content.");

  script_tag(name:"qod_type", value:"remote_vul");
  script_tag(name:"solution_type", value:"Mitigation");

  exit(0);
}

include("host_details.inc");
include("sybase_func.inc");

if(!port = get_app_port(cpe:CPE, service:"sybase_tcp_listener"))
  exit(0);

if(!get_app_location(cpe:CPE, port:port, nofork:TRUE))
  exit(0);

soc = open_sock_tcp(port);
if(!soc)
  exit(0);

# this creates a variable called sql_packet
sql_packet = make_sql_login_pkt(username:"sa", password:"");

send(socket:soc, data:sql_packet);
send(socket:soc, data:pkt_lang);
r = recv(socket:soc, length:255);
close(soc);

if(strlen(r) > 10 && ord(r[8]) == 0xE3) {

  version = substr(r, strlen(r) - 13, strlen(r) - 10);
  strver = NULL;
  for(i = 0; i < 4; i++) {
    if(strver)
      strver += '.';
    strver += ord(version[i]);
  }

  set_kb_item(name:"sybase/version", value:strver);
  security_message(port:port);
  exit(0);
}

exit(99);