Remote HTML tag injection in Gaia Search app — Mozilla

Security researcher Muneaki Nishimura reported an issue with Gaia's Search app which allows an attacker to inject HTML code into the System app's context via specially-crafted search links. The injection occurs when the user opens such malicious link in the browser and then re-opens the browser o...

Same origin violation and local file stealing via PDF reader — Mozilla

Security researcher Cody Crews reported on a way to violate the same origin policy and inject script into a non-privileged part of the built-in PDF Viewer. This would allow an attacker to read and steal sensitive local files on the victim's computer...

COPPA error screen in FxAccounts signup allows loading arbitrary web content into B2G root process — Mozilla

Kartikaya Gupta of Mozilla reported an issue within the Firefox Accounts setup dialog that would embed content from a static external URI into the System process. An attacker in a position to control a vulnerable device's network connection could use this to inject arbitrary web content into the...

Remote HTML tag injection in Gaia System app — Mozilla

Security researcher Muneaki Nishimura reported an issue with Gaia's System app which allows an attacker to inject HTML code into the System app's context via specially-crafted search links. The injection occurs when the user opens such malicious link in the browser and then presses the HOME butto...

Upper bound check bypass due to signed compare in SharedBufferManagerParent::RecvAllocateGrallocBuffer — Mozilla

Mozilla intern Julian Hector discovered a regression in the graphics buffer management of Firefox OS's graphics layer that would lead to graphics memory corruption by providing negative size parameters. JavaScript can not access the graphics layer in a way required to trigger this vulnerability,...

Use-after-free in workers while using XMLHttpRequest — Mozilla

Security researcher Looben Yang used the Address Sanitizer tool to discover two related use-after-free vulnerabilities that occur when using XMLHttpRequest in concert with either shared or dedicated workers. These errors occur when the XMLHttpRequest object is attached to a worker but that object...

Privilege escalation through internal workers — Mozilla

Mozilla community member Jonas Jenwald reported broken behavior in Mozilla's PDF.js PDF file viewer which led to the discovery that internal Workers were incorrectly executed with high privilege. If this flaw were combined with a separate vulnerability allowing for same-origin policy violation, i...

Out-of-bound read while computing an oscillator rendering range in Web Audio — Mozilla

Security researcher Holger Fuhrmannek used the Address Sanitizer tool to discover an out-of-bound read while computing an oscillator rendering range in Web Audio. This could allow an attacker to infer the contents of four bytes of memory...

Local files or privileged URLs in pages can be opened into new tabs — Mozilla

Security researcher Jann Horn reported that when Mozilla Foundation Security Advisory 2015-25 was fixed in Firefox 37, an error was made that caused the fix to not be applied to Firefox 38, effectively causing the bug to be unfixed in Firefox 38 and Firefox ESR38 once it shipped. As Armin Ebert...

NSS accepts export-length DHE keys with regular DHE cipher suites — Mozilla

Security researcher Matthew Green reported a Diffie–Hellman DHE key processing issue in Network Security Services NSS where a man-in-the-middle MITM attacker can force a server to downgrade TLS connections to 512-bit export-grade cryptography by modifying client requests to include only...

NSS incorrectly permits skipping of ServerKeyExchange — Mozilla

Security researcher Karthikeyan Bhargavan reported an issue in Network Security Services NSS where the client allows for a ECDHEECDSA exchange where the server does not send its ServerKeyExchange message instead of aborting the handshake. Instead, the NSS client will take the EC key from the ECDS...

Vulnerabilities found through code inspection — Mozilla

Security researcher Ronald Crane reported seven vulnerabilities affecting released code that he found through code inspection. These included three uses of uninitialized memory, one poor validation leading to an exploitable crash, one read of unowned memory in zip files, and two buffer overflows...

Type confusion in Indexed Database Manager — Mozilla

Security researcher Paul Bandha reported a type confusion error where part of IDBDatabase is read by the Indexed Database Manager and incorrectly used as a pointer when it shouldn't be used as such. This leads to memory corruption and the possibility of an exploitable crash...

Key pinning is ignored when overridable errors are encountered — Mozilla

Mozilla security engineer David Keeler reported that when an overridable error is encountered, such as those for expired certificates or a host name does not match a certificate, pinning checks can be be skipped. This would allow for a user to override a pinned certificate when they should not be...

OS X crash reports may contain entered key press information — Mozilla

Mozilla developer David Parks discovered while reviewing Firefox crash reports that personal data can sometimes be contained in reports from OS X systems. This is because these OS X crash reports will contain the native key that triggered the crash and this can sometimes contain key press...

ECDSA signature validation fails to handle some signatures correctly — Mozilla

Mozilla community member Watson Ladd reported that the implementation of Elliptical Curve Cryptography ECC multiplication for Elliptic Curve Digital Signature Algorithm ECDSA signature validation in Network Security Services NSS did not handle exceptional cases correctly. This could potentially...

Use-after-free in Content Policy due to microtask execution error — Mozilla

Security researcher Herre reported a use-after-free vulnerability when a Content Policy modifies the Document Object Model to remove a DOM object, which is then used afterwards due to an error in microtask implementation. This leads to an exploitable crash...

Miscellaneous memory safety hazards (rv:39.0 / rv:31.8 / rv:38.1) — 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...

Use-after-free due to Media Decoder Thread creation during shutdown — Mozilla

Security researchers Tyson Smith and Jesse Schwartzentruber reported a use-after-free during the shutdown process. This was caused by a race condition when media decoder threads are created during the shutdown process in some circumstances. This leads to a potentially exploitable crash when...

Buffer overflow with SVG content and CSS — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen found a buffer overflow during the rendering of SVG format graphics when combined with specific CSS properties on a page. This results in a potentially exploitable crash...

Buffer overflow and out-of-bounds read while parsing MP4 video metadata — Mozilla

Security researcher laf.intel reported a buffer overflow and out-of-bounds read in the libstagefright library while parsing invalid metadata in MPEG4 video files. This can lead to a potentially exploitable crash...

Privilege escalation through IPC channel messages — Mozilla

Mozilla Developer Jed Davis and Mozilla security engineer Christoph Diehl reported that Mozilla had inherited a Inter-process Communication IPC vulnerability when IPC was introduced into Mozilla products through third-party code. This could allow for privilege escalation through IPC channels due ...

Buffer overflow when parsing compressed XML — Mozilla

Security researcher Ucha Gobejishvili used the Address Sanitizer tool to find a buffer overflow while parsing compressed XML content. This was due to an error in how buffer space is created and modified when handling large amounts of XML data. This results in a potentially exploitable crash...

Referrer policy ignored when links opened by middle-click and context menu — Mozilla

Security researcher Alex Verstak reported that is ignored when a link is opened through the context menu or a middle-click by mouse. This means that, in some situations, the referrer policy is ignored when opening links in new tabs and may cause some pages to open without an HTTP Referer header...

Mozilla Windows updater can be run outside of application directory — Mozilla

Security researcher Holger Fuhrmannek previously reported CVE-2015-0833, which was fixed in MFSA2015-12. That flaw allowed for the updater to load binary DLL format files from the local working directory or from the Windows temporary directories. During the fixing of CVE-2015-0833, the need to...

Use-after-free during text processing with vertical text enabled — Mozilla

Security researcher Scott Bell used the Address Sanitizer tool to discover a use-after-free error during the processing of text when vertical text is enabled. This leads to a potentially exploitable crash...

Buffer overflow parsing H.264 video with Linux Gstreamer — Mozilla

Security researcher Aki Helin used the Address Sanitizer tool to find a buffer overflow during video playback on Linux systems. This was due to a problem in older versions of the Gstreamer plugin during the parsing of H.264 formatted video. This issue could be used to induce a possibly exploitabl...

Out-of-bounds read and write in asm.js validation — Mozilla

Security researcher Dougall Johnson reported an out-of-bounds read and write in asm.js during JavaScript validation due to an error in how heap lengths are defined. This results in a potentially exploitable crash and could allow for the reading of random memory which may contain sensitive data...

Untrusted site hosting trusted page can intercept webchannel responses — Mozilla

Mozilla developer Mark Hammond reported a flaw in how WebChannel.jsm handles message traffic. He found that when a trusted page is hosted within an on an untrusted third-party untrusted framing page, the untrusted page could intercept webchannel responses meant for the trusted page, bypassing...

Sensitive URL encoded information written to Android logcat — Mozilla

Security researcher Muneaki Nishimura reported that Firefox for Android would write potentially sensitive data to the Android logcat that was encoded as part of logged URL strings. On Android 4.0 or earlier systems, logcat data is available to any application having READLOGS permission, leading t...

Miscellaneous memory safety hazards (rv:38.0 / rv:31.7) — 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...

Memory corruption during failed plugin initialization — Mozilla

Mozilla developer Robert Kaiser Kairo reported that a race condition when initialization of a plugin fails led to a potentially exploitable use-after-free vulnerability...

Certificate verification bypass through the HTTP/2 Alt-Svc header — Mozilla

Security researcher Muneaki Nishimura discovered a flaw in the Mozilla's HTTP Alternative Services implementation. If an Alt-Svc header is specified in the HTTP/2 response, SSL certificate verification can be bypassed for the specified alternate server. As a result of this, warnings of invalid SS...

Loading privileged content through Reader mode — Mozilla

Security researcher Armin Ebert reported a flaw in Reader mode on Firefox for Android. Reader mode reformats web content for easy readability and operates as unprivileged content that is the equivalent of the formatted content. When Reader mode is unable to process content, it displays the origin...

Use-after-free when using the Fluendo MP3 GStreamer plugin — Mozilla

Security researcher Aki Helin reported a use-after-free when playing certain MP3 format audio files on the web using the Fluendo MP3 plugin for GStreamer on Linux. This is due to a flaw in handling certain MP3 files by the plugin and its interaction with Mozilla code. This can lead to a potential...

Same-origin bypass through anchor navigation — Mozilla

Mozilla developer Olli Pettay reported that while investigating Mozilla Foundation Security Advisory 2015-28, he and Mozilla developer Boris Zbarsky found an alternate way to trigger a similar vulnerability. The previously reported flaw used an issue with SVG content navigation to bypass...

CORS requests should not follow 30x redirections after preflight — Mozilla

Mozilla developer Christoph Kerschbaumer discovered an issue while investigating Mozilla Foundation Security Advisory 2015-03, previously reported by security researcher Muneaki Nishimura. This flaw was that a cross-origin resource sharing CORS request should not follow 30x redirections after...

PRNG weakness allows for DNS poisoning on Android — Mozilla

Mozilla developer Daniel Stenberg reported that the DNS resolver in Firefox for Android uses an insufficiently random algorithm when generating random numbers for the unique identifier. This was derived from an old version of the Bionic libc library and suffered from insufficient randomness in th...

Add-on lightweight theme installation approval bypassed through MITM attack — Mozilla

Security researcher Armin Ebert discovered that a man-in-the-middle MITM attacker spoofing a Mozilla sub-domain could bypass user approval messages to install a Firefox lightweight theme. This was possible because add-on installations of the lightweight themes do not require the use of HTTP over...

Miscellaneous memory safety hazards (rv:37.0 / rv:31.6) — 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...

Out of bounds read in QCMS library — Mozilla

Security researcher Felix Gröbert of Google used the Address Sanitizer tool to discover an out of bounds read in the QCMS color management library while transforming images with certain parameters. This could lead to information disclosure...

Memory corruption crashes in Off Main Thread Compositing — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover two memory corruption crashes during 2D graphics rendering due to problems in Off Main Thread Compositing. These crashes are potentially exploitable...

Cursor clickjacking with flash and images — Mozilla

Security researcher Jordi Chancel reported a mechanism that made cursor invisible through flash content and then replaced it through the layering of HTML content. This flaw can be in used in combination with an image of the cursor manipulated through JavaScript, leading to clickjacking during...

resource:// documents can load privileged pages — Mozilla

Security researcher Mariusz Mlynski reported, through HP Zero Day Initiative's Pwn2Own contest, that documents loaded though a resource: URL, such as Mozilla's PDF.js PDF file viewer, were able to subsequently load privileged chrome pages. The privilege restrictions on resource: URLs was handled...

Windows can retain access to privileged content on navigation to unprivileged pages — Mozilla

Mozilla developer Bobby Holley reported that windows created to hold privileged UI content retained access to privileged internal methods if later navigated to unprivileged content. If a separate flaw was found that allowed for web content to reference these privileged windows, an attacker could...

Use-after-free due to type confusion flaws — Mozilla

Security researcher Nils used the Address Sanitizer tool to discover two type confusion flaws. The first of these occurs while setting specific attributes of a source element resulting in incorrect object casting. The second flaw occurs when binding a source to a tree when the function fails to...

Incorrect memory management for simple-type arrays in WebRTC — Mozilla

Security researcher Mitchell Harper used Valgrind to discover incorrect memory management for simple-type arrays in WebRTC. This was undefined behavior which is theoretically dangerous but was determined to be safe in this instance...

Privilege escalation through SVG navigation — Mozilla

Security researcher Mariusz Mlynski reported, through HP Zero Day Initiative's Pwn2Own contest, a method to run arbitrary scripts in a privileged context. This bypassed the same-origin policy protections by using a flaw in the processing of SVG format content navigation...

Code execution through incorrect JavaScript bounds checking elimination — Mozilla

Security researcher ilxu1a reported, through HP Zero Day Initiative's Pwn2Own contest, a flaw in Mozilla's implementation of typed array bounds checking in JavaScript just-in-time compilation JIT and its management of bounds checking for heap access. This flaw can be leveraged into the reading an...

Buffer overflow in libstagefright during MP4 video playback — Mozilla

Security researcher Pantrombka reported a buffer overflow in the libstagefright library during video playback when certain invalid MP4 video files led to the allocation of a buffer that was too small for the content. This led to a potentially exploitable crash...