CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS
Percentile
36.1%
The version of Junos OS installed on the remote host is affected by a vulnerability as referenced in the JSA11236 advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(154120);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/13");
script_cve_id("CVE-2021-31371");
script_xref(name:"JSA", value:"JSA11236");
script_xref(name:"IAVA", value:"2021-A-0478-S");
script_name(english:"Juniper Junos OS Vulnerability (JSA11236)");
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 JSA11236
advisory.
- Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs.
It was discovered that packets utilizing these IP addresses may egress an QFX5110 switch, leaking
configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an
information exposure vulnerability. This issue affects: Juniper Networks Junos OS on QFX5110 Series: All
versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 19.1
versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to
19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4, 19.4R3-S5; 20.1 versions prior to 20.1R2-S2,
20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to
20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2; (CVE-2021-31371)
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://kb.juniper.net/JSA11236");
script_set_attribute(attribute:"solution", value:
"Apply the relevant Junos software release referenced in Juniper advisory JSA11236");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-31371");
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:"2021/10/13");
script_set_attribute(attribute:"patch_publication_date", value:"2021/10/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/10/13");
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", "Host/Juniper/model");
exit(0);
}
include('junos.inc');
var model = get_kb_item_or_exit('Host/Juniper/model');
if (model !~ "^QFX511")
{
audit(AUDIT_DEVICE_NOT_VULN, model);
}
var ver = get_kb_item_or_exit('Host/Juniper/JUNOS/Version');
var vuln_ranges = [
{'min_ver':'18.1', 'fixed_ver':'18.1R3-S13', 'model':'^QFX511'},
{'min_ver':'18.3', 'fixed_ver':'18.3R3-S5', 'model':'^QFX511'},
{'min_ver':'19.1', 'fixed_ver':'19.1R3-S6', 'model':'^QFX511'},
{'min_ver':'19.2', 'fixed_ver':'19.2R1-S7', 'model':'^QFX511'},
{'min_ver':'19.2R2', 'fixed_ver':'19.2R3-S3', 'model':'^QFX511'},
{'min_ver':'19.3', 'fixed_ver':'19.3R2-S6', 'model':'^QFX511'},
{'min_ver':'19.3R3', 'fixed_ver':'19.3R3-S3', 'model':'^QFX511'},
{'min_ver':'19.4', 'fixed_ver':'19.4R1-S4', 'model':'^QFX511'},
{'min_ver':'19.4R2', 'fixed_ver':'19.4R3-S5', 'model':'^QFX511'},
{'min_ver':'20.1', 'fixed_ver':'20.1R2-S2', 'model':'^QFX511'},
{'min_ver':'20.1R3', 'fixed_ver':'20.1R3-S1', 'model':'^QFX511'},
{'min_ver':'20.2', 'fixed_ver':'20.2R3-S2', 'model':'^QFX511'},
{'min_ver':'20.3', 'fixed_ver':'20.3R3-S1', 'model':'^QFX511'},
{'min_ver':'20.4', 'fixed_ver':'20.4R2-S1', 'model':'^QFX511', 'fixed_display':'20.4R2-S1, 20.4R3'},
{'min_ver':'21.1', 'fixed_ver':'21.1R1-S1', 'model':'^QFX511', 'fixed_display':'21.1R1-S1, 21.1R2'}
];
var 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);
var report = get_report(ver:ver, fix:fix);
security_report_v4(severity:SECURITY_WARNING, port:0, extra:report);
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS
Percentile
36.1%