https://www.mozilla.org/security/advisories/mfsa2021-52/

https://bugzilla.mozilla.org/show_bug.cgi?id=1739934

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 95.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-52 advisory.

  - Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the     target URL. (CVE-2021-43536)

  - An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory     leading to a potentially exploitable crash. (CVE-2021-43537)

  - By misusing a race in our notification code, an attacker could have forcefully hidden the notification for     pages that had received full screen and pointer lock access, which could have been used for spoofing     attacks. (CVE-2021-43538)

  - Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC     occurring within the call not tracing those live pointers. This could have led to a use-after-free causing     a potentially exploitable crash. (CVE-2021-43539)

  - WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party     websites that would not have been uninstalled with the extension. (CVE-2021-43540)

  - When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not     properly escaped. (CVE-2021-43541)

  - Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages     for loading external protocols. (CVE-2021-43542)

  - Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by     embedding additional content. (CVE-2021-43543)

  - When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent     usages of the address bar might have caused the URL to load unintentionally, which could lead to XSS and     spoofing attacks. This bug only affects Firefox for Android. Other operating systems are unaffected.
    (CVE-2021-43544)

  - Using the Location API in a loop could have caused severe application hangs and crashes. (CVE-2021-43545)

  - It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor.
    (CVE-2021-43546)

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 Windows host is prior to 95.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-52 advisory.

  - Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the     target URL. (CVE-2021-43536)

  - An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory     leading to a potentially exploitable crash. (CVE-2021-43537)

  - By misusing a race in our notification code, an attacker could have forcefully hidden the notification for     pages that had received full screen and pointer lock access, which could have been used for spoofing     attacks. (CVE-2021-43538)

  - Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC     occurring within the call not tracing those live pointers. This could have led to a use-after-free causing     a potentially exploitable crash. (CVE-2021-43539)

  - WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party     websites that would not have been uninstalled with the extension. (CVE-2021-43540)

  - When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not     properly escaped. (CVE-2021-43541)

  - Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages     for loading external protocols. (CVE-2021-43542)

  - Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by     embedding additional content. (CVE-2021-43543)

  - When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent     usages of the address bar might have caused the URL to load unintentionally, which could lead to XSS and     spoofing attacks. This bug only affects Firefox for Android. Other operating systems are unaffected.
    (CVE-2021-43544)

  - Using the Location API in a loop could have caused severe application hangs and crashes. (CVE-2021-43545)

  - It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor.
    (CVE-2021-43546)

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
155918	Mozilla Firefox < 95.0	Nessus	MacOS X Local Security Checks	critical
155917	Mozilla Firefox < 95.0	Nessus	Windows	critical

CVE-2021-43544

medium

Tenable Plugins

critical

critical