CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
79.5%
The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 78.2. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-38 advisory.
If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges.Note: This issue only affected Windows operating systems. Other operating systems are unaffected. (CVE-2020-15663)
By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user confusion, this could result in an unintended or malicious extension being installed. (CVE-2020-15664)
Mozilla developers Jason Kratzer, Christian Holler, Byron Campen, Tyson Smith reported memory safety bugs present in Firefox 79 and Firefox ESR 78.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
(CVE-2020-15670)
Note that Nessus has not tested for this issue but has instead relied only on the application’s 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 mfsa2020-38.
# The text itself is copyright (C) Mozilla Foundation.
include('compat.inc');
if (description)
{
script_id(139790);
script_version("1.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/23");
script_cve_id("CVE-2020-15663", "CVE-2020-15664", "CVE-2020-15670");
script_xref(name:"MFSA", value:"2020-38");
script_xref(name:"IAVA", value:"2020-A-0391-S");
script_name(english:"Mozilla Firefox ESR < 78.2");
script_set_attribute(attribute:"synopsis", value:
"A web browser installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 78.2. It is, therefore, affected
by multiple vulnerabilities as referenced in the mfsa2020-38 advisory.
- If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute
updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service
does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous
version which would have allowed exploitation of an older bug and arbitrary code execution with System
Privileges.Note: This issue only affected Windows operating systems. Other operating systems are
unaffected. (CVE-2020-15663)
- By holding a reference to the eval() function from an about:blank window, a malicious webpage
could have gained access to the InstallTrigger object which would allow them to prompt the user to install
an extension. Combined with user confusion, this could result in an unintended or malicious extension
being installed. (CVE-2020-15664)
- Mozilla developers Jason Kratzer, Christian Holler, Byron Campen, Tyson Smith reported memory safety bugs
present in Firefox 79 and Firefox ESR 78.1. Some of these bugs showed evidence of memory corruption and we
presume that with enough effort some of these could have been exploited to run arbitrary code.
(CVE-2020-15670)
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/mfsa2020-38/");
script_set_attribute(attribute:"solution", value:
"Upgrade to Mozilla Firefox ESR version 78.2 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
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:R/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-15663");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-15670");
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:"2020/08/25");
script_set_attribute(attribute:"patch_publication_date", value:"2020/08/25");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/08/25");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:mozilla:firefox_esr");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"MacOS X Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("macosx_firefox_installed.nasl");
script_require_keys("MacOSX/Firefox/Version");
exit(0);
}
include('mozilla_version.inc');
kb_base = 'MacOSX/Firefox';
get_kb_item_or_exit(kb_base+'/Installed');
version = get_kb_item_or_exit(kb_base+'/Version', exit_code:1);
path = get_kb_item_or_exit(kb_base+'/Path', exit_code:1);
is_esr = get_kb_item(kb_base+'/is_esr');
if (isnull(is_esr)) audit(AUDIT_NOT_INST, 'Mozilla Firefox ESR');
mozilla_check_version(version:version, path:path, product:'firefox', esr:TRUE, fix:'78.2', min:'78.0.0', severity:SECURITY_HOLE);
Vendor | Product | Version | CPE |
---|---|---|---|
mozilla | firefox_esr | cpe:/a:mozilla:firefox_esr |
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
79.5%