Information disclosure through polygon rendering in MathML — Mozilla

Security researcher Tyson Smith and Jesse Schwartzentruber of the BlackBerry Security Automated Analysis Team used the Address Sanitizer tool while fuzzing to discover an out-of-bounds read during polygon rendering in MathML. This can allow web content to potentially read protected memory...

Miscellaneous memory safety hazards (rv:28.0 / rv:24.4) — 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...

Privilege escalation using WebIDL-implemented APIs — Mozilla

Security researcher Mariusz Mlynski, via TippingPoint's Pwn2Own contest, reported that it is possible for untrusted web content to load a chrome-privileged page by getting JavaScript-implemented WebIDL to call window.open. A second bug allowed the bypassing of the popup-blocker without user...

Script execution in HTML mail replies — Mozilla

Security researcher Fabián Cuchietti discovered that it was possible to bypass the restriction on JavaScript execution in mail by embedding an with a data: URL within a message. If the victim replied or forwarded the mail after receiving it, quoting it "in-line" using Thunderbird's HTML mail...

Inconsistent JavaScript handling of access to Window objects — Mozilla

Mozilla developer Boris Zbarsky reported an inconsistency with the different JavaScript engines in how JavaScript native getters on window objects are handled by these engines. This inconsistency can lead to different behaviors in JavaScript code, allowing for a potential security issue with wind...

Firefox default start page UI content invocable by script — Mozilla

Yazan Tommalieh discovered a flaw that once users have viewed the default Firefox start page about:home, subsequent pages they navigate to in that same tab could use script to activate the buttons that were on the about:home page. Most of these simply open Firefox dialogs such as Settings or...

Use-after-free with imgRequestProxy and image processing — Mozilla

Security researcher Arthur Gerkis, via TippingPoint's Zero Day Initiative, reported a use-after-free during image processing from sites with specific content types in concert with the imgRequestProxy function. This causes a potentially exploitable crash...

Incorrect use of discarded images by RasterImage — Mozilla

Fredrik 'Flonka' Lönnqvist discovered an issue with image decoding in RasterImage caused by continued use of discarded images. This could allow for the writing to unowned memory and a potentially exploitable crash...

UI selection timeout missing on download prompts — Mozilla

Security researcher Jordi Chancel reported that the dialog for saving downloaded files did not implement a security timeout before button selections were processed. This could be used in concert with spoofing to convince users to select a different option than intended, causing downloaded files t...

Crash when using web workers with asm.js — Mozilla

Soeren Balko reported a crash when terminating a web worker running asm.js code after passing an object between threads. This crash is potentially exploitable...

Clone protected content with XBL scopes — Mozilla

Security researcher Cody Crews reported a method to bypass System Only Wrappers SOW by using XML Binding Language XBL content scopes to clone protected XUL elements. This could be used to clone anonymous nodes, making trusted XUL content web accessible...

Cross-origin information leak through web workers — Mozilla

Security researcher Masato Kinugawa reported a cross-origin information leak through web workers' error messages. This violates same-origin policy and the leaked information could potentially be used to gather authentication tokens and other data from third-party websites...

Information disclosure with *FromPoint on iframes — Mozilla

Security researcher Jordan Milne reported an information leak where document.caretPositionFromPoint and document.elementFromPoint functions could be used on a cross-origin iframe to gain information on the iframe's DOM and other attributes through a timing attack, violating same-origin policy...

NSS ticket handling issues — Mozilla

Mozilla developer Brian Smith and security researchers Antoine Delignat-Lavaud and Karthikeyan Bhargavan of the Prosecco research team at INRIA Paris reported issues with ticket handling in the Network Security Services NSS libraries. These have been addressed in the NSS 3.15.4 release, shipping ...

XSLT stylesheets treated as styles in Content Security Policy — Mozilla

Mozilla security engineer Frederik Braun reported an issue where the implementation of Content Security Policy CSP is not in compliance with the specification. XSLT stylesheets must be subject to script-src directives but Mozilla's implementation of CSP treats them as styles. This could lead to...

Miscellaneous memory safety hazards (rv:27.0 / rv:24.3) — 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...

Profile path leaks to Android system log — Mozilla

Mozilla developer Roee Hay reported that Firefox for Android profile paths leak to the Android system log. When running on Android 4.2 or earlier, other applications are able to read these log files, leading to information disclosure from the user's profile directory. This issue was also...

Potential overflow in JavaScript binary search algorithms — Mozilla

Compiler Engineer Dan Gohman of Google reported that binary search algorithms in the SpiderMonkey JavaScript engine were prone to overflow in several places, leading to potential out-of-bounds array access. While none of these are known to be directly exploitable, they are unsafe in theory and ha...

Trust settings for built-in roots ignored during EV certificate validation — Mozilla

Firefox user Sijie Xia reported that if a user explicitly removes the trust for extended validation EV capable root certificates in the certificate manager, the change is not properly used when validating EV certificates, causing the setting to be ignored. This removes the ability of users to...

Segmentation violation when replacing ordered list elements — 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 mechanism where inserting an ordered list into a document through script could lead to a potentially exploitable crash that ca...

Application Installation doorhanger persists on navigation — Mozilla

Mozilla developer Myk Melez reported that with specifically timed page navigation, the doorhanger notification for Web App installation could persist from one site to another without being dismissed by the navigation. This could be used by a malicious site to trick a user into installing an...

JPEG information leak — Mozilla

Google security researcher Michal Zalewski reported issues with JPEG format image processing with Start Of Scan SOS and Define Huffman Table DHT markers in the libjpeg library. This could allow for the possible reading of arbitrary memory content as well as cross-domain image theft...

GetElementIC typed array stubs can be generated outside observed typesets — Mozilla

Mozilla developer Eric Faust reported that during JavaScript compilation GetElementIC typed array stubs can be generated outside observed typesets. This could lead to unpredictable behavior with a potential security impact...

Mis-issued ANSSI/DCSSI certificate — Mozilla

Google notified Mozilla that an intermediate certificate, which chains up to a root included in Mozilla’s root store, was loaded into a man-in-the-middle MITM traffic management device. This certificate was issued by Agence nationale de la sécurité des systèmes d'information ANSSI, an agency of t...

Use-after-free in synthetic mouse movement — 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 user-after-free in the functions for synthetic mouse movement handling. Security researcher Atte Kettunen from OUSPG also...

Linux clipboard information disclosure though selection paste — Mozilla

Mozilla community member Vincent Lefevre reported that on Linux systems, web content can access data saved to the clipboard when a user attempts to paste a selection with a middle-click instead of pasting the selection content. This allows for possibly private data in the clipboard to be...

Use-after-free during Table Editing — Mozilla

Security researcher Nils used the Address Sanitizer tool while fuzzing to discover a use-after-free problem in the table editing user interface of the editor during garbage collection. This leads to a potentially exploitable crash...

Use-after-free in event listeners — 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 user-after-free when interacting with event listeners from the mListeners array. This leads to a potentially exploitable crash...

Sandbox restrictions not applied to nested object elements — Mozilla

Mozilla security developer Daniel Veditz discovered that restrictions are not applied to an element contained within a sandboxed iframe. This could allow content hosted within a sandboxed iframe to use element to bypass the sandbox restrictions that should be applied...

Character encoding cross-origin XSS attack — Mozilla

Security researcher Masato Kinugawa discovered that if a web page is missing character set encoding information it can inherit character encodings across navigations into another domain from an earlier site. Only same-origin inheritance is allowed according to the HTML5 specification. This issue...

Miscellaneous memory safety hazards (rv:26.0 / rv:24.2) — Mozilla

Mozilla developers 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 these could be...

Miscellaneous Network Security Services (NSS) vulnerabilities — Mozilla

Mozilla has updated the version of Network Security Services NSS library used in Mozilla projects to NSS 3.15.3 with the exception of ESR17-based releases, which have been updated to NSS 3.14.5. This addresses several moderate to critical rated networking security issues...

Memory corruption in workers — Mozilla

Security researcher Nils used the Address Sanitizer tool while fuzzing to discover a memory corruption issue with the JavaScript engine when using workers with direct proxies. This results in a potentially exploitable crash...

Miscellaneous memory safety hazards (rv:25.0 / rv:24.1 / rv:17.0.10) — Mozilla

Mozilla developers 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 these could be...

Improperly initialized memory and overflows in some JavaScript functions — Mozilla

Compiler Engineer Dan Gohman of Google discovered a flaw in the JavaScript engine where memory was being incorrectly allocated for some functions and the calls for allocations were not always properly checked for overflow, leading to potential buffer overflows. When combined with other...

Access violation with XSLT and uninitialized data — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover an access violation due to uninitialized data during Extensible Stylesheet Language Transformation XSLT processing. This leads to a potentially exploitable crash...

Miscellaneous use-after-free issues found through ASAN fuzzing — Mozilla

Security researcher Nils used the Address Sanitizer tool while fuzzing to discover missing strong references in browsing engine leading to use-after-frees. This can lead to a potentially exploitable crash...

Security bypass of PDF.js checks using iframes — Mozilla

Security researcher Cody Crews discovered a method to append an iframe into an embedded PDF object rendered with the chrome privileged PDF.js. This can used to bypass security restrictions to load local or chrome privileged files and objects within the embedded PDF object. This can lead to...

Use-after-free when updating offline cache — Mozilla

Security researcher Byoungyoung Lee of Georgia Tech Information Security Center GTISC used the Address Sanitizer tool to discover a use-after-free during state change events while updating the offline cache. This leads to a potentially exploitable crash...

Writing to cycle collected object during image decoding — Mozilla

Mozilla community member Ezra Pool reported a potentially exploitable crash on extremely large pages. This was caused when a cycle collected image object was released on the wrong thread during decoding, creating a race condition...

Spoofing addressbar though SELECT element — Mozilla

Security researcher Jordi Chancel discovered a method to put arbitrary HTML content within elements and place it in arbitrary locations. This can be used to spoof the displayed addressbar, leading to clickjacking and other spoofing attacks...

Use-after-free in HTML document templates — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a user-after-free when interacting with HTML document templates. This leads to a potentially exploitable crash...

Shared object library loading from writable location — Mozilla

Mozilla developer Vladimir Vukicevic reported that Firefox for Android will optionally load a shared object .so library in order to enable GL tracing. When this is occurs, it can be from a world writable location, allowing for it to be replaced by malicious third party applications before it is...

Improper state in HTML5 Tree Builder with templates — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG found that the HTML5 Tree Builder does not properly store state when interacting with template elements. Because some stack information is incorrectly stored, the template insertion mode stack can be used when it is...

User-defined properties on DOM proxies get the wrong "this" object — Mozilla

Mozilla developer Boris Zbarsky reported that user-defined getters on DOM proxies would incorrectly get the expando object as this. It is unlikely that this is directly exploitable but could lead to JavaScript client or add-on code making incorrect security sensitive decisions based on hacker...

GC hazard with default compartments and frame chain restoration — Mozilla

Security researcher Nils reported a potentially exploitable use-after-free in an early test version of Firefox 25. Mozilla developer Bobby Holley found that the cause was an older garbage collection bug that a more recent change made easier to trigger...

Buffer overflow with multi-column, lists, and floats — Mozilla

Security researcher Aki Helin reported that combining lists, floats, and multiple columns could trigger a potentially exploitable buffer overflow...

Use-after-free with select element — Mozilla

Security researcher Scott Bell used the Address Sanitizer tool to discover a use-after-free when using a element in a form after it has been destroyed. This could lead to a potentially exploitable crash...

Same-origin bypass through symbolic links — Mozilla

Security researcher Takeshi Terada reported a mechanism to violate same-origin policy for local files using file:// through the use of symbolic links. This problem only affects web pages loaded from the local filesystem. This could allow for cross-site scripting XSS and access to locally stored...

NativeKey continues handling key messages after widget is destroyed — Mozilla

Mozilla developer Masayuki Nakano discovered that the NativeKey widget continues handling key messages even when it is destroyed by dispatched event listeners. This could result in some key events being applied to other objects or plugins if the widget memory is reallocated to them, leading to a...