After a website had entered fullscreen mode, it could have used a previously opened popup to obscure the notification that indicates the browser is in fullscreen mode. Combined with spoofing the browser chrome, this could have led to confusing the user about the current origin of the page and credential theft or other attacks. This vulnerability affects Firefox < 74.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - Mozilla: Type confusion for special arguments in IonMonkey (CVE-2020-15656)

  - Mozilla: Malicious Extension could obtain auth codes from OAuth login flows (CVE-2020-6823)

  - Mozilla Firefox before 35.0 and SeaMonkey before 2.32 do not consider the id-pkix-ocsp-nocheck extension     in deciding whether to trust an OCSP responder, which makes it easier for remote attackers to obtain     sensitive information by sniffing the network during a session in which there was an incorrect decision to     accept a compromised and revoked certificate. (CVE-2014-8642)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - Mozilla: Type confusion for special arguments in IonMonkey (CVE-2020-15656)

  - Mozilla: Malicious Extension could obtain auth codes from OAuth login flows (CVE-2020-6823)

  - Mozilla Firefox through 27 sends HTTP Cookie headers without first validating that they have the required     character-set restrictions, which allows remote attackers to conduct the equivalent of a persistent Logout     CSRF attack via a crafted parameter that forces a web application to set a malformed cookie within an HTTP     response. (CVE-2013-6167)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 8 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - Mozilla: Type confusion for special arguments in IonMonkey (CVE-2020-15656)

  - Mozilla: Malicious Extension could obtain auth codes from OAuth login flows (CVE-2020-6823)

  - By using the reflected URL in some special resource URIs, such as chrome:, it is possible to inject     stylesheets and bypass Content Security Policy (CSP). This vulnerability affects Firefox < 63.
    (CVE-2018-12398)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4299-1 advisory.

    Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially     crafted website, an attacker could potentially exploit these to cause a denial of service, spoof the URL     or other browser chrome, obtain sensitive information, bypass Content Security Policy (CSP) protections,     or execute arbitrary code. (CVE-2019-20503, CVE-2020-6805, CVE-2020-6806, CVE-2020-6807, CVE-2020-6808,     CVE-2020-6810, CVE-2020-6812, CVE-2020-6813, CVE-2020-6814, CVE-2020-6815)

    It was discovered that Web Extensions with the all-url permission could access local files. If a user were     tricked in to installing a specially crafted extension, an attacker could potentially exploit this to     obtain sensitive information. (CVE-2020-6809)

    It was discovered that the Devtools' 'Copy as cURL' feature did not fully escape website-controlled data.
    If a user were tricked in to using the 'Copy as cURL' feature to copy and paste a command with specially     crafted data in to a terminal, an attacker could potentially exploit this to execute arbitrary commands     via command injection. (CVE-2020-6811)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote Windows host is prior to 74.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-08 advisory. Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 74.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-08 advisory. Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
200050	RHEL 7 : firefox (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
200049	RHEL 6 : firefox (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
199961	RHEL 8 : firefox (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
134442	Ubuntu 16.04 LTS / 18.04 LTS : Firefox vulnerabilities (USN-4299-1)	Nessus	Ubuntu Local Security Checks	critical
134405	Mozilla Firefox < 74.0 Multiple Vulnerabilities	Nessus	Windows	critical
134404	Mozilla Firefox < 74.0 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	critical

Detections

Analytics

CVE-2020-6810

medium

Tenable Plugins

critical

critical

critical

critical

critical

critical