Security Vulnerabilities fixed in Firefox for iOS 124 — Mozilla

Dragging Javascript URLs to the address bar could cause them to be loaded, bypassing restrictions and security protections If an insecure element was added to a page after a delay, Firefox would not replace the secure icon with a mixed content security status...

Security Vulnerabilities fixed in Firefox ESR 115.5.0 — Mozilla

On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element. It was possible to cause the use of a MessagePort after it had already been freed, which could potentially have led to ...

Security Vulnerabilities fixed in Firefox ESR 102.6 — Mozilla

A missing check related to tex units could have led to a use-after-free and potentially exploitable crash. An attacker who compromised a content process could have partially escaped the sandbox to read arbitrary files via clipboard-related IPC messages.This bug only affects Firefox for Linux. Oth...

Security Vulnerabilities fixed in Firefox ESR 68.5 — Mozilla

A content process could have modified shared memory relating to crash reporting information, crash itself, and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable crash. By downloading a file with the .fileloc extension, a semi-privileged extension...

Use-after-free in DTLS during WebRTC session shutdown — Mozilla

Security researcher Looben Yang reported a use-after-free vulnerability in WebRTC. This occurs during WebRTC session shutdown when DTLS objects in memory are freed while still actively in use. This results in a potentially exploitable crash...

Privilege escalation through file deletion by Maintenance Service updater — Mozilla

Security researcher Holger Fuhrmannek reported an issue where the Mozilla Maintenance Service updater on Windows can delete arbitrary files because of its privileged system access. This file deletion can then potentially be used for further privilege escalation. This flaw requires users to execut...

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...

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...

loadSubScript unwraps XPCNativeWrapper scope parameter (1.9.2 branch) — Mozilla

Mozilla security researcher mozbugra4 reported that the problem described in MFSA 2011-43 and fixed in Firefox 7 also affected Firefox 3.6: a malicious page could potentially exploit a Firefox user who had installed an add-on that used loadSubscript in vulnerable ways...

ParanoidFragmentSink allows javascript: URLs in chrome documents — Mozilla

Security researcher Roberto Suggi Liverani reported that ParanoidFragmentSink, a class used to sanitize potentially unsafe HTML for display, allows javascript: URLs and other inline JavaScript when the embedding document is a chrome document. While there are no unsafe uses of this class in any...

Buffer overflow in JavaScript upvarMap — Mozilla

Security researcher Christian Holler reported that the JavaScript engine's internal memory mapping of non-local JS variables contained a buffer overflow which could potentially be used by an attacker to run arbitrary code on a victim's computer...

Java security bypass from LiveConnect loaded via data: URL meta refresh — Mozilla

Security researcher Gregory Fleischer reported that when a Java LiveConnect script was loaded via a data: URL which redirects via a meta refresh, then the resulting plugin object was created with the wrong security principal and thus received elevated privileges such as the abilities to read loca...

Content policy bypass with image preloading — Mozilla

Mozilla developer Josh Soref of Nokia reported that documents failed to call certain security checks when attempting to preload images. Although the image content is not available to the page, it is possible to specify protocols that are normally not allowed in a web page such as file:. This...

Use-after-free crash in HTML parser — Mozilla

Security researcher Alin Rad Pop of Secunia Research reported that the HTML parser incorrectly freed used memory when insufficient space was available to process remaining input. Under such circumstances, memory occupied by in-use objects was freed and could later be filled with attacker-controll...

Chrome privilege escalation due to incorrectly cached wrapper — Mozilla

Mozilla add-on developer and community member Wladimir Palant reported broken functionality on pages that had a Link: HTTP header when an add-on was installed which implemented a Content Policy in JavaScript, such as AdBlock Plus or NoScript. Mozilla security researcher mozbugra4 demonstrated tha...

Crash and remote code execution during Flash player unloading — Mozilla

Security researcher Attila Suszter reported that when a page contains a Flash object which presents a slow script dialog, and the page is navigated while the dialog is still visible to the user, the Flash plugin is unloaded resulting in a crash due to a call to the deleted object. This crash coul...

XUL scripts bypass content-policy checks — Mozilla

Mozilla add-on developer and community member Wladimir Palant reported that content-loading policies were not checked before loading external script files into XUL documents. The severity of this problem would depend on the reasons behind the content policy check, which include privacy from "web...

URL spoofing with invisible control characters — Mozilla

Mozilla contributor Masahiro Yamada reported that certain invisible control characters were being decoded when displayed in the location bar, resulting in fewer visible characters than were present in the actual location. An attacker could use this vulnerability to spoof the location bar and...

Cross-domain data theft via script redirect error message — Mozilla

Google security researcher Chris Evans reported that a website could access a limited amount of data from a different domain by loading a same-domain JavaScript URL which redirects to an off-domain target resource containing data which is not parsable as JavaScript. Upon attempting to load the da...

XUL popup spoofing variant (cross-tab popups) — Mozilla

Mozilla contributor Chris Thomas demonstrated that it was possible to have a background tab create a borderless XUL pop-up in front of the active tab in the user's browser. This technique could be used by an attacker to spoof form elements such as a login prompt for a site opened in a different t...

Code execution via QuickTime Media-link files — Mozilla

On his blog Petko D. Petkov reported that QuickTime Media-Link files contain a qtnext attribute that could be used on Windows systems to launch the default browser with arbitrary command-line options. When the default browser is Firefox 2.0.0.6 or earlier use of the -chrome option allowed a remot...

Frame spoofing while window is loading — Mozilla

Ronen Zilberman and Michal Zalewski both reported that it was possible to exploit a timing issue to inject content into about:blank frames in a page. When opening a window from a script, it is possible to spoof the content of the newly opened window's frames within a short time frame, while the...

XUL Popup Spoofing — Mozilla

Chris Thomas demonstrated that XUL popups opened by web content could be placed outside the boundaries of the content area. This could be used to spoof or hide parts of the browser chrome such as the location bar...

XSS and local file access by opening blocked popupsand local file access by opening blocked popups — Mozilla

shutdown reported that if you could convince a user to open a blocked popup you could perform a cross-site scripting attack against any site that contains a frame whose source is a data: URL. To accomplish this the attacker's site would have to frame the target site plus another frame whose sourc...

RSS Feed-preview referrer leak — Mozilla

Jared Breland reported on LEGROOM.net that when the new "Feed Preview" feature in Firefox 2.0 retrieves the icons of the installed web-based feed viewers it is potentially informing those services of your feed-browsing habits by sending the URL of the feed in a referrer header with each icon...

JavaScript new Function race condition — Mozilla

H. D. Moore reported a testcase that was able to trigger a race condition where JavaScript garbage collection deleted a temporary variable still being used in the creation of a new Function object. The resulting use of a deleted object may be potentially exploitable to run native code provided by...

File stealing by changing input type — Mozilla

Claus Jörgensen reports that a text input box can be pre-filled with a filename and then turned into a file-upload control with the contents intact, allowing a malicious website the ability to steal any local file whose name they can guess...

Changing position:relative to static corrupts memory — Mozilla

Dynamically changing the style of an element from position:relative to position:static can cause Gecko to operate on freed memory. It may be possible to exploit this in order to run arbitrary code...

Window Injection Spoofing — Mozilla

A website can inject content into a popup opened by another site if the target name of the popup window is known. An attacker who knows you are going to visit that other site could spoof the contents of the popup...

Security Vulnerabilities fixed in Firefox for iOS 155.0 — Mozilla

A malicious webpage could stall a popup's cross-origin navigation after commit, causing the address bar to display the destination origin while continuing to render attacker-controlled content...

Security Vulnerabilities fixed in Thunderbird 115.15 — Mozilla

A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as the with environment. Internal browser event interfaces were exposed to web content when privileged EventHandler listener callbacks ran for those events. Web content that tried t...

Security Vulnerabilities fixed in Thunderbird 115.4.1 — Mozilla

It was possible for certain browser prompts and dialogs to be activated or dismissed unintentionally by the user due to an insufficient activation-delay. An attacker could have created a malicious link using bidirectional characters to spoof the location in the address bar when visited. Drivers a...

Insecure Sharing of HTML/JS Files in Hubs Cloud Reticulum — Mozilla

Hubs Cloud allows users to download shared content, specifically HTML and JS, which could allow javascript execution in the Hub Cloud instance’s primary hosting domain...

Crash when using shared memory in JavaScript — Mozilla

Security researcher Jukka Jylänki reported a crash that occurs because JavaScript, when using shared memory, does not properly gate access to Atomics or SharedArrayBuffer views in some contexts. This leads to a non-exploitable crash...

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...

Arbitrary code execution using SJOW and fast native function — Mozilla

Mozilla security researcher mozbugra4 reported that when content script which is running in a chrome context accesses a content object via SJOW, the content code can gain access to an object from the chrome scope and use that object to run arbitrary JavaScript with chrome privileges...

Malicious search plugins can inject code into arbitrary sites — Mozilla

Security researcher Prateek Saxena reported that a malicious MozSearch plugin could be created using a javascript: URI in the SearchForm value. This URI is used as the default landing page when an empty search is performed. If an attacker could get a user to install the malicious plugin and perfo...

Arbitrary code execution via XUL tree element — Mozilla

Security researcher Nils reported via TippingPoint's Zero Day Initiative that the XUL tree method moveToEdgeShift was in some cases triggering garbage collection routines on objects which were still in use. In such cases, the browser would crash when attempting to access a previously destroyed...

Mozilla Firefox XUL Linked Clones Double Free Vulnerability — Mozilla

An anonymous researcher, via TippingPoint's Zero Day Initiative program, reported a vulnerability in Mozilla's garbage collection process. The vulnerability was caused by improper memory management of a set of cloned XUL DOM elements which were linked as a parent and child. After reloading the...

Local file stealing with SessionStore — Mozilla

Mozilla security researcher mozbugra4 reported that a form input control's type could be changed during the restoration of a closed tab. An attacker could set an input control's text value to the path of a local file whose location was known to the attacker. If the tab was then closed and the...

XSS vulnerabilities in SessionStore — Mozilla

Mozilla security researcher mozbugra4 reported vulnerabilities in the session-restore feature by which content could be injected into an incorrect document storage location, including storage locations for other domains. An attacker could utilize these issues to violate the browser's same-origin...

XMLHttpRequest 302 response disclosure — Mozilla

Marius Schilder of Google Security reported that when a XMLHttpRequest is made to a same-origin resource which 302 redirects to a resource in a different domain, the response from the cross-domain resource is readable by the site issuing the XHR. Cookies marked HttpOnly were not readable, but oth...

Signed JAR tampering — Mozilla

Security researchers Collin Jackson and Adam Barth reported a series of vulnerabilities which allow JavaScript to be injected into the context of signed JARs and executed under the context of the JAR's signer. This could allow an attacker to run JavaScript in a victim's browser with the privilege...

Referer-spoofing via window.location race condition — Mozilla

Gregory Fleischer demonstrated that it was possible to generate a fake HTTP Referer header by exploiting a timing condition when setting the window.location property. This could be used to conduct a Cross-site Request Forgery CSRF attack against websites that rely only on the Referer header as...

Unauthorized access to wyciwyg:// documents — Mozilla

Michal Zalewski reported that it was possible to bypass the same-origin checks and read from cached wyciwyg documents. It is possible to access wyciwyg:// documents without proper same domain policy checks through the use of HTTP 302 redirects. This enables the attacker to steal sensitive data...

Embedded nulls in location.hostname confuse same-domain checks — Mozilla

Michal Zalewski demonstrated that setting location.hostname to a value with embedded null characters can confuse the browsers domain checks. Setting the value triggers a load, but the networking software reads the hostname only up to the null character while other checks for "parent domain" start...

LiveConnect crash finalizing JS objects — Mozilla

Steven Michaud reported a crash in LiveConnect, the bridge code that allows Java applets and web JavaScript to communicate. The crash is due to re-use of an already-freed object and we presume this could be exploited with enough effort...

RSA Signature Forgery — Mozilla

Philip Mackenzie and Marius Schilder of Google informed us of Daniel Bleichenbacher's recent presentation of a common implementation error in RSA signature verification, a failure to account for extra data in the signature. For signatures with a small exponent such as 3 it is possible for an...

JavaScript execution in mail via XBL — Mozilla

Georgi Guninski demonstrated that even with JavaScript disabled in mail the default an attacker can still execute JavaScript when a mail message is viewed, replied to, or forwarded by putting the script in a remote XBL file loaded by the message. The executed script could be used to alter or chan...

Popup-blocker cross-site scripting (XSS) — Mozilla

shutdown demonstrated that blocked popups opened from the status bar "blocked popups" icon were always opened in the context of the site listed in the Location address bar, even if the blocked popup were originally opened by a subframe loaded from another site. This allows the popup to perform a...