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.*. This vulnerability affects Firefox < 95.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0,
    and Firefox < 95. (CVE-2021-43539)

  - Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the
    target URL. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
    (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. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR <
    91.4.0, and Firefox < 95. (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. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
    (CVE-2021-43538)

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.

  - Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith,     Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. 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-2021-4129)

  - 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)

  - 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)

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

  - Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith,     Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. 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-2021-4129)

  - 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)

  - 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)

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

ID	Name	Product	Family	Severity
426762	Alpine: multiple librewolf packages: security update to 95.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
426762	Alpine: multiple librewolf packages: security update to 95.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
404387	Alpine: multiple firefox packages: security update to 95.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
404387	Alpine: multiple firefox packages: security update to 95.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
155918	Mozilla Firefox < 95.0	Nessus	MacOS X Local Security Checks	critical
155917	Mozilla Firefox < 95.0	Nessus	Windows	critical

Detections

Analytics

CVE-2021-43544

medium

Tenable Plugins

high

high

high

high

critical

critical