CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
91.4%
The version of Firefox installed on the remote Windows host is prior to 74.0.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-11 advisory.
Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free.
We are aware of targeted attacks in the wild abusing this flaw. (CVE-2020-6819)
Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after- free. We are aware of targeted attacks in the wild abusing this flaw. (CVE-2020-6820)
Note that Nessus has not tested for this issue but has instead relied only on the applicationβs self-reported version number.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Mozilla Foundation Security Advisory mfsa2020-11.
# The text itself is copyright (C) Mozilla Foundation.
include('compat.inc');
if (description)
{
script_id(135202);
script_version("1.10");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/04/25");
script_cve_id("CVE-2020-6819", "CVE-2020-6820");
script_xref(name:"MFSA", value:"2020-11");
script_xref(name:"IAVA", value:"2020-A-0128-S");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/05/03");
script_xref(name:"CEA-ID", value:"CEA-2020-0032");
script_name(english:"Mozilla Firefox < 74.0.1");
script_set_attribute(attribute:"synopsis", value:
"A web browser installed on the remote Windows host is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The version of Firefox installed on the remote Windows host is prior to 74.0.1. It is, therefore, affected by multiple
vulnerabilities as referenced in the mfsa2020-11 advisory.
- Under certain conditions, when running the nsDocShell
destructor, a race condition can cause a use-after-free.
We are aware of targeted attacks in the wild abusing
this flaw. (CVE-2020-6819)
- Under certain conditions, when handling a
ReadableStream, a race condition can cause a use-after-
free. We are aware of targeted attacks in the wild
abusing this flaw. (CVE-2020-6820)
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://www.mozilla.org/en-US/security/advisories/mfsa2020-11/");
script_set_attribute(attribute:"solution", value:
"Upgrade to Mozilla Firefox version 74.0.1 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-6820");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/03");
script_set_attribute(attribute:"patch_publication_date", value:"2020/04/03");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/06");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:mozilla:firefox");
script_set_attribute(attribute:"stig_severity", value:"II");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Windows");
script_copyright(english:"This script is Copyright (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("mozilla_org_installed.nasl");
script_require_keys("Mozilla/Firefox/Version");
exit(0);
}
include('mozilla_version.inc');
port = get_kb_item("SMB/transport");
if (!port) port = 445;
installs = get_kb_list("SMB/Mozilla/Firefox/*");
if (isnull(installs)) audit(AUDIT_NOT_INST, "Firefox");
mozilla_check_version(installs:installs, product:'firefox', esr:FALSE, fix:'74.0.1', severity:SECURITY_WARNING);
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
91.4%