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Security researchers Tim Philipp Schafers 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 denial of service (DOS) attack due to resource consumption and blocks the ability of users to exit the a ...

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 render arbitrary content in these limited circumstances.

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 target page may have a strict CSP that protects against this XSS attack, but if the attacker induces ...

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.

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 History, which might alarm users. In some cases a malicious page could trigger session restore and cause ...

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.

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.

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 unexpected script execution if the style-src directives were less restrictive than those for scripts.

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 to be potentially opened instead of only saved in some circumstances.

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 have been changed as part of general security improvements.


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