Juniper Networks Junos OS TCP Packet Handling Denial of Service Vulnerability

# 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

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

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.103953");
  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:"2013-11-21 11:20:27 +0700 (Thu, 21 Nov 2013)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/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-2013-6015");

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

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2013 Greenbone AG");
  script_family("JunOS Local Security Checks");
  script_dependencies("gb_juniper_junos_consolidation.nasl");
  script_mandatory_keys("juniper/junos/detected", "juniper/junos/build");

  script_tag(name:"summary", value:"A vulnerability in the Flow Daemon can cause a crash when
handling certain TCP packets.");

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

  script_tag(name:"insight", value:"On SRX Series services gateways, when plugins that use TCP proxy
are configured (e.g. ALGs, UTM), a certain sequence of valid TCP packets may cause the flow daemon (flowd)
to crash.");

  script_tag(name:"impact", value:"A remote attacker can cause a denial of service.");

  script_tag(name:"affected", value:"Platforms running Junos OS versions 10.4, 11.4, 12.1, 12.1X44,
or 12.1X45.");

  script_tag(name:"solution", value:"New builds of Junos OS software are available from Juniper. As
a workaround disable ALGs and UTM features if they are not required.");

  script_xref(name:"URL", value:"http://kb.juniper.net/JSA10596");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/62963");
  script_xref(name:"URL", value:"http://secunia.com/advisories/55218");

  exit(0);
}

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

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

build = get_kb_item("juniper/junos/build");
if (!build)
  exit(0);

desc += "Version/Build-Date:
" + version + " / " + build;

build2check = str_replace(string:build, find:"-", replace:"");

if (revcomp(a:build2check, b:"20130918") >= 0) {
  exit(99);
}

if (revcomp(a:version, b:"10.4R14") < 0) {
  security_message(port:0, data:desc);
  exit(0);
}

if (version =~ "^11") {
  if (revcomp(a:version, b:"11.4R5-S2") < 0) {
    security_message(port:0, data:desc);
    exit(0);
  }
}

if (version =~ "^12") {
  if (revcomp(a:version, b:"12.1R3") < 0) {
    security_message(port:0, data:desc);
    exit(0);
  } else if ((revcomp(a:version, b:"12.1X44-D20") < 0) &&
             (revcomp(a:version, b:"12.1X44") >= 0)) {
      security_message(port:0, data:desc);
      exit(0);
  } else if ((revcomp(a:version, b:"12.1X45-D15") < 0) &&
             (revcomp(a:version, b:"12.1X45") >= 0)) {
      security_message(port:0, data:desc);
      exit(0);
  }
}

exit(99);