Juniper Networks Junos OS TCP Packet Processing Denial of Service Vulnerability

# SPDX-FileCopyrightText: 2014 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:junos";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.105921");
  script_version("2026-04-24T06:23:04+0000");
  script_tag(name:"last_modification", value:"2026-04-24 06:23:04 +0000 (Fri, 24 Apr 2026)");
  script_tag(name:"creation_date", value:"2014-07-31 11:29:19 +0200 (Thu, 31 Jul 2014)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");

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

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

  script_cve_id("CVE-2004-0230");

  script_name("Juniper Networks Junos OS TCP Packet Processing Denial of Service Vulnerability");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2014 Greenbone AG");
  script_family("JunOS Local Security Checks");
  script_dependencies("gb_juniper_junos_consolidation.nasl");
  script_mandatory_keys("juniper/junos/detected");

  script_tag(name:"summary", value:"DoS in TCP packet processing");

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

  script_tag(name:"insight", value:"For an established TCP session, TCP input validation only ensures
that sequence numbers are within the acceptable window prior to examining whether the SYN flag is set on
the segment. If the SYN flag is set, the TCP stack drops the session and sends a RST segment to the other
side. This issue only affects TCP sessions terminating on the router. Transit traffic and TCP Proxy services
are unaffected by this vulnerability.");

  script_tag(name:"impact", value:"An attacker who can guess an in-window sequence number, source and
destination address and port numbers can exploit this vulnerability to reset any established TCP session.");

  script_tag(name:"affected", value:"Junos OS 11.4, 12.1, 12.2, 12.3, 13.1, 13.2, 13.3");

  script_tag(name:"solution", value:"New builds of Junos OS software are available from Juniper. As a
workaround enable TCP authentication, enable IPSec, enable the system to send ACKs for in-window RSTs and
SYN packets, enable a stateful firewall to block SYN packets on existing sessions.");

  script_xref(name:"URL", value:"http://kb.juniper.net/JSA10638");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/10183");

  exit(0);
}

include("host_details.inc");
include("revisions-lib.inc");

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

if (revcomp(a:version, b:"11.4R11") < 0) {
  security_message(port:0, data:version);
  exit(0);
}

if (version =~ "^12") {
  if (revcomp(a:version, b:"12.1R10") < 0) {
    security_message(port:0, data:version);
    exit(0);
  }
  else if ((revcomp(a:version, b:"12.1X44-D35") < 0) &&
           (revcomp(a:version, b:"12.1X44") >= 0)) {
    security_message(port:0, data:version);
    exit(0);
  }
  else if ((revcomp(a:version, b:"12.1X45-D25") < 0) &&
           (revcomp(a:version, b:"12.1X45") >= 0)) {
    security_message(port:0, data:version);
    exit(0);
  }
  else if ((revcomp(a:version, b:"12.1X46-D20") < 0) &&
           (revcomp(a:version, b:"12.1X46") >= 0)) {
    security_message(port:0, data:version);
    exit(0);
  }
  else if ((revcomp(a:version, b:"12.1X47-D10") < 0) &&
           (revcomp(a:version, b:"12.1X47") >= 0)) {
    security_message(port:0, data:version);
    exit(0);
  }
  else if ((revcomp(a:version, b:"12.2R8") < 0) &&
           (revcomp(a:version, b:"12.2") >= 0)) {
    security_message(port:0, data:version);
    exit(0);
  }
  else if ((revcomp(a:version, b:"12.3R6") < 0) &&
           (revcomp(a:version, b:"12.3") >= 0)) {
    security_message(port:0, data:version);
    exit(0);
  }
}

if (version =~ "^13") {
  if (revcomp(a:version, b:"13.1R4") < 0) {
    security_message(port:0, data:version);
    exit(0);
  }
  else if ((revcomp(a:version, b:"13.2R4") < 0) &&
           (revcomp(a:version, b:"13.2") >= 0)) {
    security_message(port:0, data:version);
    exit(0);
  }
  else if ((revcomp(a:version, b:"13.3R2") < 0) &&
           (revcomp(a:version, b:"13.3") >= 0)) {
    security_message(port:0, data:version);
    exit(0);
  }
}