Mozilla developers and community members reported memory safety bugs present in Firefox 62. 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 < 63.

Versions of Mozilla Firefox prior to 63 are unpatched for the following vulnerabilities as referenced in the mfsa2018-26 advisory:

 - A memory corruption bug exists that may lead to arbitrary code execution (CVE-2018-12388, CVE-2018-12390)
 - During HTTP Live Stream playback on Firefox for Android, audio data can be accessed across origins in violation of security policies. Because the problem is in the underlying Android service, this issue is addressed by treating all HLS streams as cross-origin and opaque to access. (CVE-2018-12391)
 - When manipulating user events in nested loops while opening a document through script, it is possible to trigger a potentially exploitable crash due to poor event handling. (CVE-2018-12392)
 - A potential vulnerability was found in 32-bit builds where an integer overflow during the conversion of scripts to an internal UTF-16 representation could result in allocating a buffer too small for the conversion. This leads to a possible out-of-bounds write. (CVE-2018-12393)
 - By rewriting the Host request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. (CVE-2018-12395)
 - A vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events. This allows for potential privilege escalation by the WebExtension on sites where content scripts should not be run. (CVE-2018-12396)
 - A WebExtension can request access to local files without the warning prompt stating that the extension will 'Access your data for all websites' being displayed to the user. This allows extensions to run content scripts in local pages without permission warnings when a local file is opened. (CVE-2018-12397)
 - 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). (CVE-2018-12398)
 - When a new protocol handler is registered, the API accepts a title argument which can be used to mislead users about which domain is registering the new protocol. This may result in the user approving a protocol handler that they otherwise would not have. (CVE-2018-12399)
 - In private browsing mode on Firefox for Android, favicons are cached in the cache/icons folder as they are in non-private mode. This allows information leakage of sites visited during private browsing sessions. (CVE-2018-12400)
 - Some special resource URIs will cause a non-exploitable crash if loaded with optional parameters following a '?' in the parsed string. This could lead to denial of service (DOS) attacks. (CVE-2018-12401)
 - SameSite cookies are sent on cross-origin requests when the 'Save Page As...' menu item is selected to save a page, violating cookie policy. This can result in saving the wrong version of resources based on those cookies. (CVE-2018-12402)
 - If a site is loaded over a HTTPS connection but loads a favicon resource over HTTP, the mixed content warning is not displayed to users. (CVE-2018-12403)

The version of Mozilla Firefox installed on the remote Windows host is prior to 63. It is, therefore, affected by multiple vulnerabilities :

  - During HTTP Live Stream playback on Firefox for Android, audio     data can be accessed across origins in violation of security     policies. Because the problem is in the underlying Android     service, this issue is addressed by treating all HLS streams as     cross-origin and opaque to access. *Note: this issue only affects     Firefox for Android. Desktop versions of Firefox are unaffected.*     (CVE-2018-12391)

  - When manipulating user events in nested loops while opening a     document through script, it is possible to trigger a potentially     exploitable crash due to poor event handling. (CVE-2018-12392)

  - A potential vulnerability was found in 32-bit builds where an     integer overflow during the conversion of scripts to an internal     UTF-16 representation could result in allocating a buffer too     small for the conversion. This leads to a possible out-of-bounds     write. *Note: 64-bit builds are not vulnerable to this issue.*     (CVE-2018-12393)

  - By rewriting the Host request headers using the webRequest API, a     WebExtension can bypass domain restrictions through domain     fronting. This would allow access to domains that share a host     that are otherwise restricted. (CVE-2018-12395)

  - A vulnerability where a WebExtension can run content scripts in     disallowed contexts following navigation or other events. This     allows for potential privilege escalation by the WebExtension on     sites where content scripts should not be run. (CVE-2018-12396)

  - A WebExtension can request access to local files without the     warning prompt stating that the extension will 'Access your data     for all websites' being displayed to the user. This allows     extensions to run content scripts in local pages without     permission warnings when a local file is opened. (CVE-2018-12397)

  - 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). (CVE-2018-12398)

  - When a new protocol handler is registered, the API accepts a title     argument which can be used to mislead users about which domain is     registering the new protocol. This may result in the user     approving a protocol handler that they otherwise would not have.
    (CVE-2018-12399)

  - In private browsing mode on Firefox for Android, favicons are     cached in the cache/icons folder as they are in non-private mode.
    This allows information leakage of sites visited during private     browsing sessions. *Note: this issue only affects Firefox for     Android. Desktop versions of Firefox are unaffected.*     (CVE-2018-12400)

  - Some special resource URIs will cause a non-exploitable crash if     loaded with optional parameters following a '?' in the parsed     string. This could lead to denial of service (DOS) attacks.
    (CVE-2018-12401)

  - SameSite cookies are sent on cross-origin requests when the 'Save     Page As...' menu item is selected to save a page, violating cookie     policy. This can result in saving the wrong version of resources     based on those cookies. (CVE-2018-12402)

  - If a site is loaded over a HTTPS connection but loads a favicon     resource over HTTP, the mixed content warning is not displayed to     users. (CVE-2018-12403)

  - Mozilla developers and community members Christian Holler, Dana     Keeler, Ronald Crane, Marcia Knous, Tyson Smith, Daniel Veditz,     and Steve Fink reported memory safety bugs present in Firefox 62.
    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-2018-12388)

  - Mozilla developers and community members Christian Holler, Bob     Owen, Boris Zbarsky, Calixte Denizet, Jason Kratzer, Jed Davis,     Taegeon Lee, Philipp, Ronald Crane, Raul Gurzau, Gary Kwong, Tyson     Smith, Raymond Forbes, and Bogdan Tara reported memory safety bugs     present in Firefox 62 and Firefox ESR 60.2. 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-2018-12390)

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

The version of Mozilla Firefox installed on the remote macOS host is prior to 63. It is, therefore, affected by multiple vulnerabilities :

  - During HTTP Live Stream playback on Firefox for Android, audio     data can be accessed across origins in violation of security     policies. Because the problem is in the underlying Android     service, this issue is addressed by treating all HLS streams as     cross-origin and opaque to access. *Note: this issue only affects     Firefox for Android. Desktop versions of Firefox are unaffected.*     (CVE-2018-12391)

  - When manipulating user events in nested loops while opening a     document through script, it is possible to trigger a potentially     exploitable crash due to poor event handling. (CVE-2018-12392)

  - A potential vulnerability was found in 32-bit builds where an     integer overflow during the conversion of scripts to an internal     UTF-16 representation could result in allocating a buffer too     small for the conversion. This leads to a possible out-of-bounds     write. *Note: 64-bit builds are not vulnerable to this issue.*     (CVE-2018-12393)

  - By rewriting the Host request headers using the webRequest API, a     WebExtension can bypass domain restrictions through domain     fronting. This would allow access to domains that share a host     that are otherwise restricted. (CVE-2018-12395)

  - A vulnerability where a WebExtension can run content scripts in     disallowed contexts following navigation or other events. This     allows for potential privilege escalation by the WebExtension on     sites where content scripts should not be run. (CVE-2018-12396)

  - A WebExtension can request access to local files without the     warning prompt stating that the extension will 'Access your data     for all websites' being displayed to the user. This allows     extensions to run content scripts in local pages without     permission warnings when a local file is opened. (CVE-2018-12397)

  - 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). (CVE-2018-12398)

  - When a new protocol handler is registered, the API accepts a title     argument which can be used to mislead users about which domain is     registering the new protocol. This may result in the user     approving a protocol handler that they otherwise would not have.
    (CVE-2018-12399)

  - In private browsing mode on Firefox for Android, favicons are     cached in the cache/icons folder as they are in non-private mode.
    This allows information leakage of sites visited during private     browsing sessions. *Note: this issue only affects Firefox for     Android. Desktop versions of Firefox are unaffected.*     (CVE-2018-12400)

  - Some special resource URIs will cause a non-exploitable crash if     loaded with optional parameters following a '?' in the parsed     string. This could lead to denial of service (DOS) attacks.
    (CVE-2018-12401)

  - SameSite cookies are sent on cross-origin requests when the 'Save     Page As...' menu item is selected to save a page, violating cookie     policy. This can result in saving the wrong version of resources     based on those cookies. (CVE-2018-12402)

  - If a site is loaded over a HTTPS connection but loads a favicon     resource over HTTP, the mixed content warning is not displayed to     users. (CVE-2018-12403)

  - Mozilla developers and community members Christian Holler, Dana     Keeler, Ronald Crane, Marcia Knous, Tyson Smith, Daniel Veditz,     and Steve Fink reported memory safety bugs present in Firefox 62.
    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-2018-12388)

  - Mozilla developers and community members Christian Holler, Bob     Owen, Boris Zbarsky, Calixte Denizet, Jason Kratzer, Jed Davis,     Taegeon Lee, Philipp, Ronald Crane, Raul Gurzau, Gary Kwong, Tyson     Smith, Raymond Forbes, and Bogdan Tara reported memory safety bugs     present in Firefox 62 and Firefox ESR 60.2. 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-2018-12390)

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

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3801-1 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, bypass CSP     restrictions, spoof the protocol registration notification bar, leak SameSite cookies, bypass mixed     content warnings, or execute arbitrary code. (CVE-2018-12388, CVE-2018-12390, CVE-2018-12392,     CVE-2018-12393, CVE-2018-12398, CVE-2018-12399, CVE-2018-12401, CVE-2018-12402, CVE-2018-12403)

    Multiple security issues were discovered with WebExtensions in Firefox. If a user were tricked in to     installing a specially crafted extension, an attacker could potentially exploit these to bypass domain     restrictions, gain additional privileges, or run content scripts in local pages without permission.
    (CVE-2018-12395, CVE-2018-12396, CVE-2018-12397)

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-2018-12391: HTTP Live Stream audio data is accessible cross-origin

CVE-2018-12392: Crash with nested event loops

CVE-2018-12393: Integer overflow during Unicode conversion while loading JavaScript

CVE-2018-12395: WebExtension bypass of domain restrictions through header rewriting

CVE-2018-12396: WebExtension content scripts can execute in disallowed contexts

CVE-2018-12397 :

CVE-2018-12398: CSP bypass through stylesheet injection in resource URIs

CVE-2018-12399: Spoofing of protocol registration notification bar

CVE-2018-12400: Favicons are cached in private browsing mode on Firefox for Android

CVE-2018-12401: DOS attack through special resource URI parsing

CVE-2018-12402: SameSite cookies leak when pages are explicitly saved

CVE-2018-12403: Mixed content warning is not displayed when HTTPS page loads a favicon over HTTP

CVE-2018-12388: Memory safety bugs fixed in Firefox 63

CVE-2018-12390: Memory safety bugs fixed in Firefox 63 and Firefox ESR 60.3

ID	Name	Product	Family	Severity
700410	Mozilla Firefox < 63 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	high
118397	Mozilla Firefox < 63 Multiple Vulnerabilities	Nessus	Windows	critical
118396	Mozilla Firefox < 63 Multiple Vulnerabilities (macOS)	Nessus	MacOS X Local Security Checks	critical
118393	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : Firefox vulnerabilities (USN-3801-1)	Nessus	Ubuntu Local Security Checks	critical
118336	FreeBSD : mozilla -- multiple vulnerabilities (7c3a02b9-3273-4426-a0ba-f90fad2ff72e)	Nessus	FreeBSD Local Security Checks	critical

Detections

Analytics

CVE-2018-12388

high

Tenable Plugins

high

critical

critical

critical

critical