Multiple Security issues with ScreenOS (JSA10713)

# SPDX-FileCopyrightText: 2015 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

CPE = "cpe:/o:juniper:screenos";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.105494");
  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_cve_id("CVE-2015-7755", "CVE-2015-7754", "CVE-2015-7756");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_version("2026-04-24T06:23:04+0000");

  script_name("Multiple Security issues with ScreenOS (JSA10713)");

  script_xref(name:"URL", value:"http://kb.juniper.net/index?page=content&id=JSA10713&actp=RSS");
  script_xref(name:"URL", value:"http://kb.juniper.net/index?page=content&id=JSA10712&actp=RSS");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"The first issue allows unauthorized remote administrative access to the device over SSH or telnet. Exploitation of this vulnerability can lead to complete compromise
of the affected system. The second issue may allow a knowledgeable attacker who can monitor VPN traffic to decrypt that traffic. It is independent of the first issue.

The third issue may result in a system crash during a crafted SSH negotiation when ssh-pka is configured and enabled on the firewall. In the worst case scenario, the unhandled SSH exception resulting
in a system crash could lead to remote code execution. This issue can affect any product or platform running ScreenOS 6.3.0r20.

 In February 2018 it was discovered that this vulnerability is being exploited by the 'DoubleDoor' Internet of Things
 (IoT) Botnet.");

  script_tag(name:"solution", value:"This issue was fixed in ScreenOS 6.2.0r19, 6.3.0r21, and all subsequent releases.");

  script_tag(name:"summary", value:"ScreenOS is vulnerable to an unauthorized remote administrative access to the device over SSH or telnet and to unauthorized decrypting of VPN traffic");
  script_tag(name:"affected", value:"These issues can affect any product or platform running ScreenOS 6.2.0r15 through 6.2.0r18 and 6.3.0r12 through 6.3.0r20.");

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

  script_tag(name:"last_modification", value:"2026-04-24 06:23:04 +0000 (Fri, 24 Apr 2026)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2026-04-21 16:27:21 +0000 (Tue, 21 Apr 2026)");
  script_tag(name:"creation_date", value:"2015-12-18 09:58:55 +0100 (Fri, 18 Dec 2015)");
  script_category(ACT_GATHER_INFO);
  script_family("General");
  script_copyright("Copyright (C) 2015 Greenbone AG");
  script_dependencies("gb_screenos_version.nasl");
  script_mandatory_keys("ScreenOS/version");

  exit(0);
}

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

if( ! version = get_app_version( cpe:CPE ) ) exit( 0 );

display_version = version;

version = str_replace( string:version, find:"r", replace:"." );
version = str_replace( string:version, find:"-", replace:"." );

if( version =~ '^6\\.2\\.0' )
{
  if( version_is_less( version:version, test_version:"6.2.0.15" ) ) exit( 99 );

  display_fix = '6.2.0r19';
  fix = '6.2.0.19';
}
else if( version =~ '^6\\.3\\.0' )
{
  if( version_is_less( version:version, test_version:"6.3.0.12" ) ) exit( 99 );

  display_fix = '6.3.0r21';
  fix = '6.3.0.21';

  # Additionally, earlier affected releases of ScreenOS 6.3.0 have been respun to resolve these issues.
  # Fixes are included in: 6.3.0r12b, 6.3.0r13b, 6.3.0r14b, 6.3.0r15b, 6.3.0r16b, 6.3.0r17b, 6.3.0r18b, 6.3.0r19b.
  patched = make_list( "6.3.0r12b", "6.3.0r13b", "6.3.0r14b", "6.3.0r15b", "6.3.0r16b", "6.3.0r17b", "6.3.0r18b", "6.3.0r19b");
  foreach p ( patched )
    if( display_version =~ '^' + p ) exit( 99 );
}

if( ! fix ) exit( 99 );

if( version_is_less( version:version, test_version:fix ) )
{
  report = 'Installed version: ' + display_version + '\n' +
           'Fixed version:     ' + display_fix + '\n';

  security_message( port:0, data:report );
  exit( 0 );
}

exit( 99 );