Juniper Junos OS Vulnerability (JSA11195)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');

include('compat.inc');

if (description)
{
  script_id(151633);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/26");
  script_xref(name:"JSA", value:"JSA11195");
  script_xref(name:"IAVA", value:"2021-A-0324-S");

  script_name(english:"Juniper Junos OS Vulnerability (JSA11195)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"The version of Junos OS installed on the remote host is affected by a vulnerability as referenced in the JSA11195
advisory.

  - vulnerability in Juniper Networks Junos OS caused by Missing Release of Memory after Effective Lifetime
    leads to a memory leak each time the CLI command 'show system connections extensive' is executed. The
    amount of memory leaked on each execution depends on the number of TCP connections from and to the system.
    Repeated execution will cause more memory to leak and eventually daemons that need to allocate
    additionally memory and ultimately the kernel to crash, which will result in traffic loss. (CVE-2021-0293)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-0293");
  script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/JSA11195");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA11195");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-0293");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/07/14");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:juniper:junos");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Junos Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("junos_version.nasl");
  script_require_keys("Host/Juniper/JUNOS/Version");

  exit(0);
}

include('junos.inc');


ver = get_kb_item_or_exit('Host/Juniper/JUNOS/Version');

vuln_ranges = [
  {'min_ver':'18.2', 'fixed_ver':'18.2R2-S8'},
  {'min_ver':'18.3', 'fixed_ver':'18.3R3-S4'},
  {'min_ver':'18.4', 'fixed_ver':'18.4R1-S8'},
  {'min_ver':'19.1', 'fixed_ver':'19.1R1-S6'},
  {'min_ver':'19.2', 'fixed_ver':'19.2R1-S6'},
  {'min_ver':'19.3', 'fixed_ver':'19.3R2-S6'},
  {'min_ver':'19.4', 'fixed_ver':'19.4R1-S4'},
  {'min_ver':'20.1', 'fixed_ver':'20.1R2'},
  {'min_ver':'20.2', 'fixed_ver':'20.2R2-S1'},
  {'min_ver':'20.3', 'fixed_ver':'20.3R1-S1'}
];

fix = junos_compare_range(target_version:ver, vuln_ranges:vuln_ranges);
if (empty_or_null(fix)) audit(AUDIT_INST_VER_NOT_VULN, 'Junos OS', ver);
report = get_report(ver:ver, fix:fix);
security_report_v4(severity:SECURITY_WARNING, port:0, extra:report);