Mozilla developers and community members reported memory safety bugs present in Firefox 65. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 66.

The version of Firefox installed on the remote host is prior to 66.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2019-07 advisory:

 - A use-after-free vulnerability can occur when a raw pointer to a DOM element on a page is obtained using JavaScript and the element is then removed while still in use. This results in a potentially exploitable crash.(CVE-2019-9790)
 - The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR).This allows for possible arbitrary reading and writing of objects during an exploitable crash. (CVE-2019-9791)
 - The IonMonkey just-in-time (JIT) compiler can leak an internal JSOPTIMIZEDOUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash.(CVE-2019-9792)
 - A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. This vulnerability could allow an attacker to create an arbitrary value in compiled JavaScript, for which the range analysis will infer a fully controlled, incorrect range in circumstances where users have explicitly disabled Spectre mitigations. Note: Spectre mitigations are currently enabled for all users by default settings. (CVE-2019-9793)
 - A vulnerability was discovered where specific command line arguments are not properly discarded during Firefox invocation as a shell handler for URLs. This could be used to retrieve and execute files whose location is supplied through these command line arguments if Firefox is configured as the default URI handler for a given URI scheme in third party applications and these applications insufficiently sanitize URL data. Note: This issue only affects Windows operating systems.Other operating systems are unaffected. (CVE-2019-9794)
 - A vulnerability exists where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by malicious JavaScript to trigger a potentially exploitable crash. (CVE-2019-9795)
 - A use-after-free vulnerability can occur when the SMIL animation controller incorrectly registers with the refresh driver twice when only a single registration is expected. When a registration is later freed with the removal of the animation controller element, the refresh driver incorrectly leaves a dangling pointer to the driver's observer array. (CVE-2019-9796)
 - Cross-origin images can be read in violation of the same-origin policy by exporting an image after using createImageBitmap to read the image and then rendering the resulting bitmap image within a canvas element. (CVE-2019-9797)
 - On Android systems, Firefox can load a library from APITRACELIB, which is writable by all users and applications. This could allow malicious third party applications to execute a man-in-the-middle attack if a malicious code was written to that location and loaded. Note: This issue only affects Android. Other operating systems are unaffected. (CVE-2019-9798)
 - Insufficient bounds checking of data during inter-process communication might allow a compromised content process to be able to read memory from the parent process under certain conditions. (CVE-2019-9799)
 - Firefox will accept any registered Program ID as an external protocol handler and offer to launch this local application when given a matching URL on Windows operating systems. This should only happen if the program has specifically registered itself as a URL Handler in the Windows registry. Note: This issue only affects Windows operating systems. Other operating systems are unaffected. (CVE-2019-9801)
 - If a Sandbox content process is compromised, it can initiate an FTP download which will then use a child process to render the downloaded data. The downloaded data can then be passed to the Chrome process with an arbitrary file length supplied by an attacker, bypassing sandbox protections and allow for a potential memory read of adjacent data from the privileged Chrome process, which may include sensitive data.(CVE-2019-9802)
 - The Upgrade-Insecure-Requests (UIR) specification states that if UIR is enabled through Content Security Policy (CSP), navigation to a same-origin URL must be upgraded to HTTPS. Firefox will incorrectly navigate to an HTTP URL rather than perform the security upgrade requested by the CSP in some circumstances, allowing for potential man-in-the-middle attacks on the linked resources.(CVE-2019-9803)
 - In Firefox Developer Tools it is possible that pasting the result of the 'Copy as cURL' command into a command shell on macOS will cause the execution of unintended additional bash script commands if the URL was maliciously crafted. This is the result of an issue with the native version of Bash on macOS. Note: This issue only affects macOS. Other operating systems are unaffected. (CVE-2019-9804)
 - A latent vulnerability exists in the Prio library where data may be read from uninitialized memory for some functions, leading to potential memory corruption.(CVE-2019-9805)
 - A vulnerability exists during authorization prompting for FTP transaction where successive modal prompts are displayed and cannot be immediately dismissed. This allows for a denial of service (DOS) attack.(CVE-2019-9806)
 - When arbitrary text is sent over an FTP connection and a page reload is initiated, it is possible to create a modal alert message with this text as the content. This could potentially be used for social engineering attacks. (CVE-2019-9807)
 - If the source for resources on a page is through an FTP connection, it is possible to trigger a series of modal alert messages for these resources through invalid credentials or locations. These messages cannot be immediately dismissed, allowing for a denial of service (DOS) attack. (CVE-2019-9809)
 - If WebRTC permission is requested from documents with data: or blob: URLs, the permission notifications do not properly display the originating domain. The notification states Unknown origin as the requestee, leading to user confusion about which site is asking for this permission. (CVE-2019-9808)
 - Mozilla developers and community members Dragana Damjanovic, Emilio Cobos lvarez, Henri Sivonen, Narcis Beleuzu, Julian Seward, Marcia Knous, Gary Kwong, Tyson Smith, Yaron Tausky, Ronald Crane, and Andr Bargull reported memory safety bugs present in Firefox 65. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.(CVE-2019-9789)
 - Mozilla developers and community members Bob Clary, Chun-Min Chang, Aral Yaman, Andreea Pavel, Jonathan Kew, Gary Kwong, Alex Gaynor, Masayuki Nakano, and Anne van Kesteren reported memory safety bugs present in Firefox 65 and Firefox ESR 60.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. (CVE-2019-9788)

 Note that Nessus Network Monitor has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3918-2 advisory.

    USN-3918-1 fixed vulnerabilities in Firefox. This update provides the corresponding updates for Ubuntu     14.04 LTS.



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 remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3918-1 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 via application     crash, denial of service via successive FTP authorization prompts or modal alerts, trick the user with     confusing permission request prompts, obtain sensitive information, conduct social engineering attacks, or     execute arbitrary code. (CVE-2019-9788, CVE-2019-9789, CVE-2019-9790, CVE-2019-9791, CVE-2019-9792,     CVE-2019-9795, CVE-2019-9796, CVE-2019-9797, CVE-2019-9799, CVE-2019-9802, CVE-2019-9805, CVE-2019-9806,     CVE-2019-9807, CVE-2019-9808, CVE-2019-9809)

    A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if     Spectre mitigations have been disabled. If a user were tricked in to opening a specially crafted website     with Spectre mitigations disabled, an attacker could potentially exploit this to cause a denial of     service, or execute arbitrary code. (CVE-2019-9793)

    It was discovered that Upgrade-Insecure-Requests was incorrectly enforced for same-origin navigation. An     attacker could potentially exploit this to conduct machine-in-the-middle (MITM) attacks. (CVE-2019-9803)

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.

Mozilla Foundation reports :

CVE-2019-9790: Use-after-free when removing in-use DOM elements

CVE-2019-9791: Type inference is incorrect for constructors entered through on-stack replacement with IonMonkey

CVE-2019-9792: IonMonkey leaks JS_OPTIMIZED_OUT magic value to script

CVE-2019-9793: Improper bounds checks when Spectre mitigations are disabled

CVE-2019-9794: Command line arguments not discarded during execution

CVE-2019-9795: Type-confusion in IonMonkey JIT compiler

CVE-2019-9796: Use-after-free with SMIL animation controller

CVE-2019-9797: Cross-origin theft of images with createImageBitmap

CVE-2019-9798: Library is loaded from world-writable APITRACE_LIB location

CVE-2019-9799: Information disclosure via IPC channel messages

CVE-2019-9801: Windows programs that are not 'URL Handlers' are exposed to web content

CVE-2019-9802: Chrome process information leak

CVE-2019-9803: Upgrade-Insecure-Requests incorrectly enforced for same-origin navigation

CVE-2019-9804: Code execution through 'Copy as cURL' in Firefox Developer Tools on macOS

CVE-2019-9805: Potential use of uninitialized memory in Prio

CVE-2019-9806: Denial of service through successive FTP authorization prompts

CVE-2019-9807: Text sent through FTP connection can be incorporated into alert messages

CVE-2019-9809: Denial of service through FTP modal alert error messages

CVE-2019-9808: WebRTC permissions can display incorrect origin with data: and blob: URLs

CVE-2019-9789: Memory safety bugs fixed in Firefox 66

CVE-2019-9788: Memory safety bugs fixed in Firefox 66 and Firefox ESR 60.6

The version of Firefox installed on the remote Windows host is prior to 66.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2019-07 advisory.

  - A use-after-free vulnerability can occur when a raw     pointer to a DOM element on a page is obtained using     JavaScript and the element is then removed while still     in use. This results in a potentially exploitable crash.
    (CVE-2019-9790)

  - The type inference system allows the compilation of     functions that can cause type confusions between     arbitrary objects when compiled through the IonMonkey     just-in-time (JIT) compiler and when the constructor     function is entered through on-stack replacement (OSR).
    This allows for possible arbitrary reading and writing     of objects during an exploitable crash. (CVE-2019-9791)

  - The IonMonkey just-in-time (JIT) compiler can leak an     internal JSOPTIMIZEDOUT magic value to the     running script during a bailout. This magic value can     then be used by JavaScript to achieve memory corruption,     which results in a potentially exploitable crash.
    (CVE-2019-9792)

  - A mechanism was discovered that removes some bounds     checking for string, array, or typed array accesses if     Spectre mitigations have been disabled. This     vulnerability could allow an attacker to create an     arbitrary value in compiled JavaScript, for which the     range analysis will infer a fully controlled, incorrect     range in circumstances where users have explicitly     disabled Spectre mitigations.  Note: Spectre     mitigations are currently enabled for all users by     default settings. (CVE-2019-9793)

  - A vulnerability was discovered where specific command     line arguments are not properly discarded during Firefox     invocation as a shell handler for URLs. This could be     used to retrieve and execute files whose location is     supplied through these command line arguments if Firefox     is configured as the default URI handler for a given URI     scheme in third party applications and these     applications insufficiently sanitize URL data.     Note: This issue only affects Windows operating systems.
    Other operating systems are unaffected. (CVE-2019-9794)

  - A vulnerability where type-confusion in the IonMonkey     just-in-time (JIT) compiler could potentially be used by     malicious JavaScript to trigger a potentially     exploitable crash. (CVE-2019-9795)

  - A use-after-free vulnerability can occur when the SMIL     animation controller incorrectly registers with the     refresh driver twice when only a single registration is     expected. When a registration is later freed with the     removal of the animation controller element, the refresh     driver incorrectly leaves a dangling pointer to the     driver's observer array. (CVE-2019-9796)

  - Cross-origin images can be read in violation of the     same-origin policy by exporting an image after using     createImageBitmap to read the image and     then rendering the resulting bitmap image within a     canvas element. (CVE-2019-9797)

  - On Android systems, Firefox can load a library from     APITRACELIB, which is writable by all users     and applications. This could allow malicious third party     applications to execute a man-in-the-middle attack if a     malicious code was written to that location and loaded.
     Note: This issue only affects Android. Other     operating systems are unaffected. (CVE-2019-9798)

  - Insufficient bounds checking of data during inter-     process communication might allow a compromised content     process to be able to read memory from the parent     process under certain conditions. (CVE-2019-9799)

  - Firefox will accept any registered Program ID as an     external protocol handler and offer to launch this local     application when given a matching URL on Windows     operating systems. This should only happen if the     program has specifically registered itself as a URL     Handler in the Windows registry.  Note: This issue     only affects Windows operating systems. Other operating     systems are unaffected. (CVE-2019-9801)

  - If a Sandbox content process is compromised, it can     initiate an FTP download which will then use a child     process to render the downloaded data. The downloaded     data can then be passed to the Chrome process with an     arbitrary file length supplied by an attacker, bypassing     sandbox protections and allow for a potential memory     read of adjacent data from the privileged Chrome     process, which may include sensitive data.
    (CVE-2019-9802)

  - The Upgrade-Insecure-Requests (UIR) specification states     that if UIR is enabled through Content Security Policy     (CSP), navigation to a same-origin URL must be upgraded     to HTTPS. Firefox will incorrectly navigate to an HTTP     URL rather than perform the security upgrade requested     by the CSP in some circumstances, allowing for potential     man-in-the-middle attacks on the linked resources.
    (CVE-2019-9803)

  - In Firefox Developer Tools it is possible that pasting     the result of the 'Copy as cURL'  command into a command     shell on macOS will cause the execution of unintended     additional bash script commands if the URL was     maliciously crafted. This is the result of an issue with     the native version of Bash on macOS.  Note: This     issue only affects macOS. Other operating systems are     unaffected. (CVE-2019-9804)

  - A latent vulnerability exists in the Prio library where     data may be read from uninitialized memory for some     functions, leading to potential memory corruption.
    (CVE-2019-9805)

  - A vulnerability exists during authorization prompting     for FTP transaction where successive modal prompts are     displayed and cannot be immediately dismissed. This     allows for a denial of service (DOS) attack.
    (CVE-2019-9806)

  - When arbitrary text is sent over an FTP connection and a     page reload is initiated, it is possible to create a     modal alert message with this text as the content. This     could potentially be used for social engineering     attacks. (CVE-2019-9807)

  - If the source for resources on a page is through an FTP     connection, it is possible to trigger a series of modal     alert messages for these resources through invalid     credentials or locations. These messages cannot be     immediately dismissed, allowing for a denial of service     (DOS) attack. (CVE-2019-9809)

  - If WebRTC permission is requested from documents with     data: or blob: URLs, the permission notifications do not     properly display the originating domain. The     notification states Unknown origin as the requestee,     leading to user confusion about which site is asking for     this permission. (CVE-2019-9808)

  - Mozilla developers and community members Dragana     Damjanovic, Emilio Cobos lvarez, Henri Sivonen, Narcis     Beleuzu, Julian Seward, Marcia Knous, Gary Kwong, Tyson     Smith, Yaron Tausky, Ronald Crane, and Andr Bargull     reported memory safety bugs present in Firefox 65. Some     of these bugs showed evidence of memory corruption and     we presume that with enough effort that some of these     could be exploited to run arbitrary code.
    (CVE-2019-9789)

  - Mozilla developers and community members Bob Clary,     Chun-Min Chang, Aral Yaman, Andreea Pavel, Jonathan Kew,     Gary Kwong, Alex Gaynor, Masayuki Nakano, and Anne van     Kesteren reported memory safety bugs present in Firefox     65 and Firefox ESR 60.5. Some of these bugs showed     evidence of memory corruption and we presume that with     enough effort that some of these could be exploited to     run arbitrary code. (CVE-2019-9788)

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 66.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2019-07 advisory.

  - A use-after-free vulnerability can occur when a raw     pointer to a DOM element on a page is obtained using     JavaScript and the element is then removed while still     in use. This results in a potentially exploitable crash.
    (CVE-2019-9790)

  - The type inference system allows the compilation of     functions that can cause type confusions between     arbitrary objects when compiled through the IonMonkey     just-in-time (JIT) compiler and when the constructor     function is entered through on-stack replacement (OSR).
    This allows for possible arbitrary reading and writing     of objects during an exploitable crash. (CVE-2019-9791)

  - The IonMonkey just-in-time (JIT) compiler can leak an     internal JSOPTIMIZEDOUT magic value to the     running script during a bailout. This magic value can     then be used by JavaScript to achieve memory corruption,     which results in a potentially exploitable crash.
    (CVE-2019-9792)

  - A mechanism was discovered that removes some bounds     checking for string, array, or typed array accesses if     Spectre mitigations have been disabled. This     vulnerability could allow an attacker to create an     arbitrary value in compiled JavaScript, for which the     range analysis will infer a fully controlled, incorrect     range in circumstances where users have explicitly     disabled Spectre mitigations.  Note: Spectre     mitigations are currently enabled for all users by     default settings. (CVE-2019-9793)

  - A vulnerability was discovered where specific command     line arguments are not properly discarded during Firefox     invocation as a shell handler for URLs. This could be     used to retrieve and execute files whose location is     supplied through these command line arguments if Firefox     is configured as the default URI handler for a given URI     scheme in third party applications and these     applications insufficiently sanitize URL data.     Note: This issue only affects Windows operating systems.
    Other operating systems are unaffected. (CVE-2019-9794)

  - A vulnerability where type-confusion in the IonMonkey     just-in-time (JIT) compiler could potentially be used by     malicious JavaScript to trigger a potentially     exploitable crash. (CVE-2019-9795)

  - A use-after-free vulnerability can occur when the SMIL     animation controller incorrectly registers with the     refresh driver twice when only a single registration is     expected. When a registration is later freed with the     removal of the animation controller element, the refresh     driver incorrectly leaves a dangling pointer to the     driver's observer array. (CVE-2019-9796)

  - Cross-origin images can be read in violation of the     same-origin policy by exporting an image after using     createImageBitmap to read the image and     then rendering the resulting bitmap image within a     canvas element. (CVE-2019-9797)

  - On Android systems, Firefox can load a library from     APITRACELIB, which is writable by all users     and applications. This could allow malicious third party     applications to execute a man-in-the-middle attack if a     malicious code was written to that location and loaded.
     Note: This issue only affects Android. Other     operating systems are unaffected. (CVE-2019-9798)

  - Insufficient bounds checking of data during inter-     process communication might allow a compromised content     process to be able to read memory from the parent     process under certain conditions. (CVE-2019-9799)

  - Firefox will accept any registered Program ID as an     external protocol handler and offer to launch this local     application when given a matching URL on Windows     operating systems. This should only happen if the     program has specifically registered itself as a URL     Handler in the Windows registry.  Note: This issue     only affects Windows operating systems. Other operating     systems are unaffected. (CVE-2019-9801)

  - If a Sandbox content process is compromised, it can     initiate an FTP download which will then use a child     process to render the downloaded data. The downloaded     data can then be passed to the Chrome process with an     arbitrary file length supplied by an attacker, bypassing     sandbox protections and allow for a potential memory     read of adjacent data from the privileged Chrome     process, which may include sensitive data.
    (CVE-2019-9802)

  - The Upgrade-Insecure-Requests (UIR) specification states     that if UIR is enabled through Content Security Policy     (CSP), navigation to a same-origin URL must be upgraded     to HTTPS. Firefox will incorrectly navigate to an HTTP     URL rather than perform the security upgrade requested     by the CSP in some circumstances, allowing for potential     man-in-the-middle attacks on the linked resources.
    (CVE-2019-9803)

  - In Firefox Developer Tools it is possible that pasting     the result of the 'Copy as cURL'  command into a command     shell on macOS will cause the execution of unintended     additional bash script commands if the URL was     maliciously crafted. This is the result of an issue with     the native version of Bash on macOS.  Note: This     issue only affects macOS. Other operating systems are     unaffected. (CVE-2019-9804)

  - A latent vulnerability exists in the Prio library where     data may be read from uninitialized memory for some     functions, leading to potential memory corruption.
    (CVE-2019-9805)

  - A vulnerability exists during authorization prompting     for FTP transaction where successive modal prompts are     displayed and cannot be immediately dismissed. This     allows for a denial of service (DOS) attack.
    (CVE-2019-9806)

  - When arbitrary text is sent over an FTP connection and a     page reload is initiated, it is possible to create a     modal alert message with this text as the content. This     could potentially be used for social engineering     attacks. (CVE-2019-9807)

  - If the source for resources on a page is through an FTP     connection, it is possible to trigger a series of modal     alert messages for these resources through invalid     credentials or locations. These messages cannot be     immediately dismissed, allowing for a denial of service     (DOS) attack. (CVE-2019-9809)

  - If WebRTC permission is requested from documents with     data: or blob: URLs, the permission notifications do not     properly display the originating domain. The     notification states Unknown origin as the requestee,     leading to user confusion about which site is asking for     this permission. (CVE-2019-9808)

  - Mozilla developers and community members Dragana     Damjanovic, Emilio Cobos lvarez, Henri Sivonen, Narcis     Beleuzu, Julian Seward, Marcia Knous, Gary Kwong, Tyson     Smith, Yaron Tausky, Ronald Crane, and Andr Bargull     reported memory safety bugs present in Firefox 65. Some     of these bugs showed evidence of memory corruption and     we presume that with enough effort that some of these     could be exploited to run arbitrary code.
    (CVE-2019-9789)

  - Mozilla developers and community members Bob Clary,     Chun-Min Chang, Aral Yaman, Andreea Pavel, Jonathan Kew,     Gary Kwong, Alex Gaynor, Masayuki Nakano, and Anne van     Kesteren reported memory safety bugs present in Firefox     65 and Firefox ESR 60.5. Some of these bugs showed     evidence of memory corruption and we presume that with     enough effort that some of these could be exploited to     run arbitrary code. (CVE-2019-9788)

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
700487	Mozilla Firefox < 66.0 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	critical
123127	Ubuntu 14.04 LTS : Firefox vulnerabilities (USN-3918-2)	Nessus	Ubuntu Local Security Checks	critical
123078	Ubuntu 16.04 LTS / 18.04 LTS : Firefox vulnerabilities (USN-3918-1)	Nessus	Ubuntu Local Security Checks	critical
122959	FreeBSD : mozilla -- multiple vulnerabilities (05da6b56-3e66-4306-9ea3-89fafe939726)	Nessus	FreeBSD Local Security Checks	critical
122948	Mozilla Firefox < 66.0	Nessus	Windows	critical
122947	Mozilla Firefox < 66.0	Nessus	MacOS X Local Security Checks	critical

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CVE-2019-9789

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