6.8 Medium
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
8.8 High
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
9 High
AI Score
Confidence
High
0.012 Low
EPSS
Percentile
85.6%
The version of Firefox installed on the remote macOS or Mac OS X host is prior to 86.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-07 advisory.
As specified in the W3C Content Security Policy draft, when creating a violation report, User agents need to ensure that the source file is the URL requested by the page, pre-redirects. If thats not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage. Under certain types of redirects, Firefox incorrectly set the source file to be the destination of the redirects. This was fixed to be the redirect destination’s origin. (CVE-2021-23969)
Context-specific code was included in a shared jump table; resulting in assertions being triggered in multithreaded wasm code. (CVE-2021-23970)
If Content Security Policy blocked frame navigation, the full destination of a redirect served in the frame was reported in the violation report; as opposed to the original frame URI. This could be used to leak sensitive information contained in such URIs. (CVE-2021-23968)
The DOMParser API did not properly process <noscript> elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. (CVE-2021-23974)
When processing a redirect with a conflicting Referrer-Policy, Firefox would have adopted the redirect’s Referrer-Policy. This would have potentially resulted in more information than intended by the original origin being provided to the destination of the redirect. (CVE-2021-23971)
When accepting a malicious intent from other installed apps, Firefox for Android accepted manifests from arbitrary file paths and allowed declaring webapp manifests for other origins. This could be used to gain fullscreen access for UI spoofing and could also lead to cross-origin attacks on targeted websites.Note: This issue is a different issue from CVE-2020-26954 and only affected Firefox for Android. Other operating systems are unaffected. (CVE-2021-23976)
Firefox for Android suffered from a time-of-check-time-of-use vulnerability that allowed a malicious application to read sensitive data from application directories.Note: This issue is only affected Firefox for Android. Other operating systems are unaffected. (CVE-2021-23977)
One phishing tactic on the web is to provide a link with HTTP Auth. For example https://[email protected]. To mitigate this type of attack, Firefox will display a warning dialog; however, this warning dialog would not have been displayed if evil.com used a redirect that was cached by the browser. (CVE-2021-23972)
The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked; we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. (CVE-2021-23975)
When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted, and the content of that error may have revealed information about the resource. (CVE-2021-23973)
Mozilla developers Alexis Beingessner, Tyson Smith, Nika Layzell, and Mats Palmgren reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. 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-2021-23978)
Mozilla developers Tyson Smith, Lars T Hansen, Valentin Gosu, and Sebastian Hengst reported memory safety bugs present in Firefox 85. 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-2021-23979)
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 mfsa2021-07.
# The text itself is copyright (C) Mozilla Foundation.
##
include('compat.inc');
if (description)
{
script_id(146779);
script_version("1.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/19");
script_cve_id(
"CVE-2021-23968",
"CVE-2021-23969",
"CVE-2021-23970",
"CVE-2021-23971",
"CVE-2021-23972",
"CVE-2021-23973",
"CVE-2021-23974",
"CVE-2021-23975",
"CVE-2021-23976",
"CVE-2021-23977",
"CVE-2021-23978",
"CVE-2021-23979"
);
script_xref(name:"IAVA", value:"2021-A-0107-S");
script_name(english:"Mozilla Firefox < 86.0");
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 installed on the remote macOS or Mac OS X host is prior to 86.0. It is, therefore, affected by
multiple vulnerabilities as referenced in the mfsa2021-07 advisory.
- As specified in the W3C Content Security Policy draft, when creating a violation report, User agents need
to ensure that the source file is the URL requested by the page, pre-redirects. If thats not possible,
user agents need to strip the URL down to an origin to avoid unintentional leakage. Under certain types
of redirects, Firefox incorrectly set the source file to be the destination of the redirects. This was
fixed to be the redirect destination's origin. (CVE-2021-23969)
- Context-specific code was included in a shared jump table; resulting in assertions being triggered in
multithreaded wasm code. (CVE-2021-23970)
- If Content Security Policy blocked frame navigation, the full destination of a redirect served in the
frame was reported in the violation report; as opposed to the original frame URI. This could be used to
leak sensitive information contained in such URIs. (CVE-2021-23968)
- The DOMParser API did not properly process <noscript> elements for escaping. This could
be used as an mXSS vector to bypass an HTML Sanitizer. (CVE-2021-23974)
- When processing a redirect with a conflicting Referrer-Policy, Firefox would have adopted the redirect's
Referrer-Policy. This would have potentially resulted in more information than intended by the original
origin being provided to the destination of the redirect. (CVE-2021-23971)
- When accepting a malicious intent from other installed apps, Firefox for Android accepted manifests from
arbitrary file paths and allowed declaring webapp manifests for other origins. This could be used to gain
fullscreen access for UI spoofing and could also lead to cross-origin attacks on targeted
websites.Note: This issue is a different issue from CVE-2020-26954 and only affected Firefox for
Android. Other operating systems are unaffected. (CVE-2021-23976)
- Firefox for Android suffered from a time-of-check-time-of-use vulnerability that allowed a malicious
application to read sensitive data from application directories.Note: This issue is only affected
Firefox for Android. Other operating systems are unaffected. (CVE-2021-23977)
- One phishing tactic on the web is to provide a link with HTTP Auth. For example
https://[email protected]. To mitigate this type of attack, Firefox will
display a warning dialog; however, this warning dialog would not have been displayed if evil.com used a
redirect that was cached by the browser. (CVE-2021-23972)
- The developer page about:memory has a Measure function for exploring what object types the browser has
allocated and their sizes. When this function was invoked; we incorrectly called the sizeof function,
instead of using the API method that checks for invalid pointers. (CVE-2021-23975)
- When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted,
and the content of that error may have revealed information about the resource. (CVE-2021-23973)
- Mozilla developers Alexis Beingessner, Tyson Smith, Nika Layzell, and Mats Palmgren reported memory safety
bugs present in Firefox 85 and Firefox ESR 78.7. 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-2021-23978)
- Mozilla developers Tyson Smith, Lars T Hansen, Valentin Gosu, and Sebastian Hengst reported memory safety
bugs present in Firefox 85. 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-2021-23979)
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/mfsa2021-07/");
script_set_attribute(attribute:"solution", value:
"Upgrade to Mozilla Firefox version 86.0 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:POC/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:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-23979");
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:"2021/02/23");
script_set_attribute(attribute:"patch_publication_date", value:"2021/02/23");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/02/23");
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:"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) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("macosx_firefox_installed.nasl");
script_require_keys("MacOSX/Firefox/Installed");
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 (is_esr) exit(0, 'The Mozilla Firefox installation is in the ESR branch.');
mozilla_check_version(version:version, path:path, product:'firefox', esr:FALSE, fix:'86.0', xss:TRUE, severity:SECURITY_WARNING);
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23968
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23969
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23970
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23971
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23972
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23973
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23974
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23975
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23976
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23977
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23978
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23979
www.mozilla.org/en-US/security/advisories/mfsa2021-07/
6.8 Medium
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
8.8 High
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
9 High
AI Score
Confidence
High
0.012 Low
EPSS
Percentile
85.6%