Profile directory file access through file: protocol — Mozilla

Security researcher Yu Dongsong reported on Firefox for Android that a file: protocol hyperlink could link to a local file in the Firefox profile directory, bypassing access restrictions. This issue was previously addressed in Mozilla Foundation Security Advisory 2014-33 but not completely...

Crash in Skia library when scaling high quality images — Mozilla

Mozilla community member John reported a crash in the Skia library when scaling high quality images if the scaling operation takes too long. This is caused by the image data being discarded while still in use by the scaling operation. This crash is potentially exploitable on some systems...

Buffer overflow during Web Audio buffering for playback — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG discovered a buffer overflow during interaction with the Web Audio buffer for playback because of an error in the the amount of allocated memory for buffers. This leads to a potentially exploitable crash with some audi...

Exploitable WebGL crash with Cesium JavaScript library — Mozilla

Developer Patrick Cozzi reported a crash in some circumstances when using the Cesium JavaScript library to generate WebGL content. Mozilla developers determined that this crash is potentially exploitable...

Use-after-free while when manipulating certificates in the trusted cache — Mozilla

Security researchers Tyson Smith and Jesse Schwartzentruber used the Address Sanitizer tool while fuzzing to discover a use-after-free error resulting in a crash. This is a result of a pair of NSSCertificate structures being added to a trust domain and then one of them is removed while they are...

IFRAME sandbox same-origin access through redirect — Mozilla

Mozilla developer Boris Zbarsky discovered an issue where network-level redirects cause an sandbox to forget its unique origin and behave as if the allow-same-origin keyword were applied. This allows the sandboxed content to access other content from the same origin without explicit approval...

Use-after-free in Web Audio due to incorrect control message ordering — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG discovered a use-after-free in Web Audio due to an issue with how control messages for Web Audio are ordered and processed. This leads to a potentially exploitable crash...

Certificate parsing broken by non-standard character encoding — Mozilla

Mozilla security researcher Christian Holler discovered several issues while fuzzing the parsing of SSL certificates. Two of these issues were a result of using characters that are not UTF-8 in certificates when various functions expected all strings to be UTF-8 format. The third issue was a resu...

Use-after-free in DirectWrite font handling — Mozilla

Mozilla community member James Kitchener reported a crash in DirectWrite when rendering MathML content with specific fonts due to an error in how font resources and tables are handled. This leads to use-after-free of a DirectWrite font-face object, resulting in a potentially exploitable crash...

Use-after-free with FireOnStateChange event — Mozilla

Security researcher Jethro Beekman of the University of California, Berkeley reported a crash when the FireOnStateChange event is triggered in some circumstances. This leads to a use-after-free and a potentially exploitable crash when it occurs...

Toolbar dialog customization event spoofing — Mozilla

Mozilla developers David Chan and Gijs Kruitbosch reported that it is possible to create a drag and drop event in web content which mimics the behavior of a chrome customization event. This can occur when a user is customizing a page or panel. This results in a limited ability to move UI icons...

Miscellaneous memory safety hazards (rv:31.0 / rv:24.7) — Mozilla

Mozilla developers and community identified identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least...

Use-after-free with SMIL Animation Controller — Mozilla

Security researcher Nils used the Address Sanitizer to discover a use-after-free problem with the SMIL Animation Controller when interacting with and rendering improperly formed web content. This causes a potentially exploitable crash...

Clickjacking through cursor invisibility after Flash interaction — Mozilla

Security researcher Jordi Chancel reported a mechanism where the cursor can be rendered invisible after it has been used on an embedded flash object when used outside of the object. This flaw can be in used in combination with an image of the cursor manipulated through JavaScript, leading to...

Buffer overflow in Gamepad API — Mozilla

Security researcher Looben Yang reported a buffer overflow in Gamepad API when it is exercised with a gamepad device with non-contiguous axes. This can be either an actual physical device or by the installation of a virtual gamepad. This results in a potentially exploitable crash. The Gamepad API...

Buffer overflow in Web Audio Speex resampler — Mozilla

Security researcher Holger Fuhrmannek used the used the Address Sanitizer tool to discover a buffer overflow with the Speex resampler in Web Audio when working with audio content that exceeds expected bounds. This leads to a potentially exploitable crash...

Use-after-free in Event Listener Manager — Mozilla

Security researchers Tyson Smith and Jesse Schwartzentruber of the BlackBerry Security Automated Analysis Team used the Address Sanitizer tool while fuzzing to discover a use-after-free in the event listener manager. This can be triggered by web content and leads to a potentially exploitable cras...

Out of bounds write in NSPR — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team reported an out of bounds write in the Netscape Portable Runtime NSPR leading to a potentially exploitable crash or code execution. This issue is fixed in NSPR version 4.10.6...

Use-after-free and out of bounds issues found using Address Sanitizer — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team discovered a number of use-after-free and out of bounds read issues using the Address Sanitizer tool. These issues are potentially exploitable, allowing for remote code execution...

Miscellaneous memory safety hazards (rv:30.0 / rv:24.6) — Mozilla

Mozilla developers and community identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of the...

Cross-site scripting (XSS) using history navigations — Mozilla

Mozilla security researcher mozbugra4 reported a method to use browser navigations through history to load a website with that page's baseURI property pointing to that of another site instead of the seemingly loaded one. The user will continue to see the incorrect site in the addressbar of the...

Out of bounds read while decoding JPG images — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a fixed offset out of bounds read issue while decoding specifically formatted JPG format images. This causes a non-exploitable crash...

Web Audio memory corruption issues — Mozilla

Security researcher Ash reported an out of bounds read issue with Web Audio. This issue could allow for web content to trigger crashes that are potentially exploitable...

Debugger can bypass XrayWrappers with JavaScript — Mozilla

Mozilla developer Boris Zbarsky discovered that the debugger will work with some objects while bypassing XrayWrappers. This could lead to privilege escalation if the victim used the debugger to interact with a malicious page...

Privilege escalation through Web Notification API — Mozilla

Security researcher Mariusz Mlynski discovered an issue where sites that have been given notification permissions by a user can bypass security checks on source components for the Web Notification API. This allows for script to be run in a privileged context through notifications, leading to...

Use-after-free in nsHostResolver — Mozilla

Security researchers Tyson Smith and Jesse Schwartzentruber of the BlackBerry Security Automated Analysis Team used the Address Sanitizer tool while fuzzing to discover a use-after-free during host resolution in some circumstances. This leads to a potentially exploitable crash...

Incorrect IDNA domain name matching for wildcard certificates — Mozilla

Security researcher Christian Heimes reported that the Network Security Services NSS library does not handle IDNA domain prefixes according to RFC 6125 for wildcard certificates. This leads to improper wildcard matching of domains when they should not be matched in compliance with the...

Use-after-free in the Text Track Manager for HTML video — Mozilla

Using the Address Sanitizer tool, security researcher Abhishek Arya Inferno of the Google Chrome Security Team found a use-after-free in the Text Track Manager while processing HTML video. This was caused by inconsistent garbage collection of Text Track Manager variables and results in a...

Privilege escalation through Mozilla Maintenance Service Installer — Mozilla

Security researcher Ash reported an issue affected the Mozilla Maintenance Service on Windows systems. The Mozilla Maintenance Service installer writes to a temporary directory created during the update process which is writable by users. If malicious DLL files are placed within this directory...

Miscellaneous memory safety hazards (rv:29.0 / rv:24.5) — Mozilla

Mozilla developers and community identified identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least...

Firefox for Android addressbar suppression — Mozilla

Security researcher Juho Nurminen reported that on Firefox for Android, when the addressbar has been scrolled off screen, an attacker can prevent it from rendering again through the use of script interacting DOM events. This allows an attacker to present a fake addressbar to the user, possibly...

Use-after-free in imgLoader while resizing images — Mozilla

Security researcher Nils discovered a use-after-free error in which the imgLoader object is freed while an image is being resized. This results in a potentially exploitable crash...

Out-of-bounds write in Cairo — Mozilla

Security researcher Jukka Jylänki reported a crash in the the Cairo graphics library. This happens when Cairo paints out-of-bounds to the destination buffer in the compositing function when working with canvas in certain circumstances. This issue allows malicious web content to cause a potentiall...

Buffer overflow when using non-XBL object as XBL — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a buffer overflow when a script uses a non-XBL object as an XBL object because the XBL status of the object is not properly validated. The resulting memory corruption is...

File: protocol links downloaded to SD card by default — Mozilla

Security researcher Roee Hay reported that a hyperlink using the file: protocol on Firefox for Android could link to a local file in the Firefox profile directory. If a user selected this link on their device, the linked file would be copied to the SD card without prompting. This SD card location...

Out-of-bounds write through TypedArrayObject after neutering — Mozilla

Security researcher George Hotz, via TippingPoint's Pwn2Own contest, discovered an issue where values are copied from an array into a second, neutered array. This allows for an out-of-bounds write into memory, causing an exploitable crash leading to arbitrary code execution...

Use-after-free in TypeObject — Mozilla

Security research firm VUPEN, via TippingPoint's Pwn2Own contest, reported that memory pressure during Garbage Collection could lead to memory corruption of TypeObjects in the JS engine, resulting in an exploitable use-after-free condition...

Content Security Policy for data: documents not preserved by session restore — Mozilla

Security researcher Nicolas Golubovic reported that the Content Security Policy CSP of data: documents was not saved as part of session restore. If an attacker convinced a victim to open a document from a data: URL injected onto a page, this can lead to a Cross-Site Scripting XSS attack. The targ...

onbeforeunload and Javascript navigation DOS — Mozilla

Security researchers Tim Philipp Schäfers and Sebastian Neef, the team of Internetwache.org, reported a mechanism using JavaScript onbeforeunload events with page navigation to prevent users from closing a malicious page's tab and causing the browser to become unresponsive. This allows for a deni...

crypto.generateCRMFRequest does not validate type of key — Mozilla

Mozilla developer David Keeler reported that the crypto.generateCRFMRequest method did not correctly validate the key type of the KeyParams argument when generating ec-dual-use requests. This could lead to a crash and a denial of service DOS attack...

Out of bounds read during WAV file decoding — Mozilla

Security researcher Atte Kettunen from OUSPG reported an out of bounds read during the decoding of WAV format audio files for playback. This could allow web content access to heap data as well as causing a crash...

Spoofing attack on WebRTC permission prompt — Mozilla

Mozilla developer Ehsan Akhgari reported a spoofing attack where the permission prompt for a WebRTC session can appear to be from a different site than its actual originating site if a timed navigation occurs during the prompt generation. This allows an attacker to potentially gain access to the...

Android Crash Reporter open to manipulation — Mozilla

Firefox for Android includes a Crash Reporter which sends crash data to Mozilla for analysis. Security researcher Roee Hay reported that third party Android applications could launch the crash reporter with their own arguments. Normally applications cannot read the private files of another...

Firefox OS DeviceStorageFile object vulnerable to relative path escape — Mozilla

Mozlla developer Ben Turner discovered that the protection against Directory Traversal through the DeviceStorage API was implemented in the wrong process on Firefox OS. If a Firefox OS application with any device-storage permissions were compromised an attacker could escape the media sandbox and...

WebGL content injection from one domain to rendering in another — Mozilla

Mozilla developer Jeff Gilbert discovered a mechanism where a malicious site with WebGL content could inject content from its context to that of another site's WebGL context, causing the second site to replace textures and similar content. This cannot be used to steal data but could be used to...

Local file access via Open Link in new tab — Mozilla

Security researcher Alex Inführ reported that on Firefox for Android it is possible to open links to local files from web content by selecting "Open Link in New Tab" from the context menu using the file: protocol. The web content would have to know the precise location of a malicious local file i...

Files extracted during updates are not always read only — Mozilla

Security researcher Ash reported an issue where the extracted files for updates to existing files are not read only during the update process. This allows for the potential replacement or modification of these files during the update process if a malicious application is present on the local syst...

Memory corruption in Cairo during PDF font rendering — Mozilla

Security researcher John Thomson discovered a memory corruption in the Cairo graphics library during font rendering of a PDF file for display. This memory corruption leads to a potentially exploitable crash and to a denial of service DOS. This issues is not able to be triggered in a default...

Out-of-bounds read/write through neutering ArrayBuffer objects — Mozilla

Security researcher Jüri Aedla, via TippingPoint's Pwn2Own contest, reported that TypedArrayObject does not handle the case where ArrayBuffer objects are neutered, setting their length to zero while still in use. This leads to out-of-bounds reads and writes into the JavaScript heap, allowing for...

SVG filters information disclosure through feDisplacementMap — Mozilla

Mozilla developer Robert O'Callahan reported a mechanism for timing attacks involving SVG filters and displacements input to feDisplacementMap. This allows displacements to potentially be correlated with values derived from content. This is similar to the previously reported techniques used for S...