Disabling scripts in Add-on SDK panels has no effect — Mozilla

Add-on authors Jason Hamilton and Peter Arremann with AMO editor Sylvain Giroux reported a vulnerability when a panel is created using the Add-on SDK in a browser extension. Defining a panel with script: false is supposed to disable script execution but it was found that inline script would still...

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...

Buffer overflow while parsing media content — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a buffer overflow during the parsing of media content. This leads to a potentially exploitable crash...

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...

Location bar spoofing via tall line-height Unicode characters — Mozilla

Security researcher Juan Pablo Lopez Yacubian reported that the default Windows font used to render the locationbar and other text fields was improperly displaying certain Unicode characters with tall line-height. In such cases the tall line-height would cause the rest of the text in the input...

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...

Crash and remote code execution using watch and __defineSetter__ on SVG element — Mozilla

Security researcher PenPal reported a crash involving a SVG element on which a watch function and defineSetter function have been set for a particular property. The crash showed evidence of memory corruption and could potentially be used by an attacker to run arbitrary code on a victim's computer...

Directives to not cache pages ignored — Mozilla

Paul Nel reported that certain HTTP directives to not cache web pages, Cache-Control: no-store and Cache-Control: no-cache for HTTPS pages, were being ignored by Firefox 3. On a shared system, applications relying upon these HTTP directives could potentially expose private data. Another user on t...

URL token stealing via stylesheet redirect — Mozilla

Security researcher Martin Straka reported that Gecko-based browsers update the .href property of stylesheet DOM nodes to reflect the final URI of the stylesheet after following any 302 redirects much as the document.location property is updated. This differs from other browsers and could...

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...

onUnload Tailgating — Mozilla

Michal Zalewski demonstrated that onUnload event handlers had access to the address of the new page about to be loaded, even if the navigation was triggered from outside the page content such as by using a bookmark, pressing the back button, or typing an address into the location bar. If the...

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...

Mozilla SVG Processing Remote Code Execution — Mozilla

Appending an SVG comment DOM node from one document into another type of document such as HTML in some cases results in a crash due to memory corruption that can be exploited to run arbitrary code...

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...

Crashes with evidence of memory corruption (rv:1.8.0.5) — Mozilla

As part of the Firefox 1.5.0.5 stability and security release, developers in the Mozilla community looked for and fixed several crash bugs to improve the stability of Mozilla clients. Some of these crashes showed evidence of memory corruption that we presume could be exploited to run arbitrary co...

Web site XSS using BOM on UTF-8 pages — Mozilla

Masatoshi Kimura reports that the Unicode Byte-order-Mark BOM is stripped from UTF-8 pages during the conversion to Unicode before the parser sees the web page. As a result the parser will see and process script tags that web input sanitizers may miss because they appear as "scrBOMipt" or similar...

Security check of js_ValueToFunctionObject() can be circumvented — Mozilla

The security check in jsValueToFunctionObject can be bypassed by clever use of setTimeout and the new Firefox 1.5 array method ForEach. shutdown demonstrated how to leverage this into a privilege escalation vulnerability that would allow the installation of malware...

Code execution through shared function objects — Mozilla

Improper cloning of base objects allowed web content scripts to walk up the prototype chain to get to a privileged object. This could be used to execute code with enhanced privileges...

Security Vulnerabilities fixed in Firefox ESR 140.3 — Mozilla

Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code...

Security vulnerability fixed in Firefox 137.0.2 — Mozilla

A race condition existed in nsHttpTransaction that could have been exploited to cause memory corruption, potentially leading to an exploitable condition...

Security Vulnerabilities fixed in Firefox 134 — Mozilla

In resizeToAtLeast of SkRegion.cpp, there was a possible out of bounds write due to an integer overflow When redirecting to an invalid protocol scheme, an attacker could spoof the address bar. Note: This issue only affected Android operating systems. Other operating systems are unaffected. Under...

Partial same-origin-policy through setting location.host through data URI — Mozilla

Security researcher Armin Ebert reported that the location.host property can be set to an arbitrary string after creating an invalid data: URI. This allows for a bypass of some same-origin policy protections. This issue is mitigated by the data: URI in use and any same-origin checks for http: or...

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...

Application Reputation service disabled in Firefox 43 — Mozilla

Mozilla developer François Marier reported that the Firefox was unable to reach the Application Reputation service due to a bug introduced in Firefox 43, disabling the ability to warn against potentially malicious downloads. Other parts of the Safe Browsing feature, for example the warnings about...

Addressbar spoofing through stored data url shortcuts on Firefox for Android — Mozilla

Security researcher Muneaki Nishimura reported an issue with displayed URLs and bookmarks on Firefox for Android. If a data: URL is opened from a stored shortcut on the homescreen or from a BOOKMARK intent from another installed Android application, the addressbar continues to show the data: url...

JavaScript garbage collection crash with Java applet — Mozilla

Mozilla community member Vytautas Staraitis reported an issue with the interaction of Java applets and JavaScript. The Java plugin can deallocate a JavaScript wrapper when it is still in use, which leads to a JavaScript garbage collection crash. This crash is potentially exploitable...

Scriptable plugin execution in SeaMonkey mail — Mozilla

Security researcher Georgi Guninski reported that scriptable plugin content, such as Flash objects, could be loaded and executed in SeaMonkey mail messages by embedding the content in an iframe inside the message. If a user were to reply to or forward such a message, malicious JavaScript embedded...

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...

URL spoofing with invalid unicode characters — Mozilla

Mozilla add-on developer Pavel Cvrcek reported that certain invalid unicode characters, when used as part of an IDN, are displayed as whitespace in the location bar. This whitespace could be used to force part of the URL out of view in the location bar. An attacker could use this vulnerability to...

XSS hazard using third-party stylesheets and XBL bindings — Mozilla

Web developer Cefn Hoile reported that sites which allow users to embed third-party stylesheets are vulnerable to script injection attacks using XBL bindings. While this behavior was documented previously, it was determined that this particular risk was not well-understood by some websites. To...

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...

Faulty .properties file results in uninitialized memory being used — Mozilla

Mozilla developer Daniel Glazman demonstrated that an improperly encoded .properties file in an add-on can result in uninitialized memory being used. This could potentially result in small chunks of data formerly used by other programs being exposed to the add-on code. If the localized string wer...

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...

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...

Crashes with evidence of memory corruption (rv:1.8.0.10/1.8.1.2) — Mozilla

As part of the Firefox 2.0.0.2 and 1.5.0.10 update releases we fixed several bugs to improve the stability of the product. Some of these were crashes that showed evidence of memory corruption and we presume that with enough effort at least some of these could be exploited to run arbitrary code...

Information disclosure through cache collisions — Mozilla

Aad reported that two web pages can collide in the disk cache with the result that depending on order loaded the end of the longer document can be appended to the shorter when the shorter is reloaded from the cache. It is possible a determined hacker could construct a targeted attack to steal som...

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...

XSS using outer window's Function object — Mozilla

mozbugra4 demonstrated that the Function prototype regression described in bug 355161 could be exploited to bypass the protections against cross site script XSS injection, which could be used to steal credentials or sensitive data from arbitrary sites or perform destructive actions on behalf of a...

XSS with XPCNativeWrapper(window).Function(...) — Mozilla

shutdown reports that cross-site scripting XSS attacks could be performed using the construct XPCNativeWrapperwindow.Function..., which created a function that appeared to belong to the window in question even after it had been navigated to the target site...

PAC privilege escalation using Function.prototype.call — Mozilla

mozbugra4 reports that a malicious Proxy AutoConfig PAC server could serve a PAC script that can execute code with elevated privileges by setting the required FindProxyForURL function to the eval method on a privileged object that leaked into the PAC sandbox. By redirecting the victim to a...

Deleted object reference when designMode="on" — Mozilla

Martijn Wargers and Nick Mott each described crashes that were discovered to ultimately stem from the same root cause: attempting to use a deleted controller context when designMode was turned on. This generally results in crashing the browser, but in theory references to deleted objects can be...

Security Vulnerabilities fixed in Firefox ESR 115.37 — Mozilla

Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code...

Security Vulnerabilities fixed in Firefox ESR 128.11 — Mozilla

A double-free could have occurred in vpxcodecencinitmulti after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. Error handling for script execution was incorrectly isolated from web content, which could ha...

Security Vulnerabilities fixed in Firefox ESR 115.24 — Mozilla

A double-free could have occurred in vpxcodecencinitmulti after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. Error handling for script execution was incorrectly isolated from web content, which could ha...

Security Vulnerabilities fixed in Thunderbird 138 — Mozilla

Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations...

Reading sensitive profile files through local HTML file on Android — Mozilla

Security researcher Jordi Chancel reported an issue in Firefox for Android where a locally saved HTML file could use file: URIs to trigger the download of additional files or opening of cached profile data without user awareness...

JavaScript immutable property enforcement can be bypassed — Mozilla

Mozilla developer Jeff Walden reported that in Gecko's implementation of ECMAScript 5 API's enforces non-configurable properties with logic specific to each API. Scripts that do not go through these APIs can bypass these protections and make changes to the immutable properties in violation of...

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...

Reader Mode pages have chrome privileges — Mozilla

Security researcher Warren He reported that when a page is transitioned into Reader Mode in Firefox for Android, the resulting page has chrome privileges and its content is not thoroughly sanitized. A successful attack requires user enabling of reader mode for a malicious page, which could then...

use after free in nsXBLDocumentInfo::ReadPrototypeBindings — Mozilla

Mozilla developers Andrew McCreight and Olli Pettay found that ReadPrototypeBindings will leave a XBL binding in a hash table even when the function fails. If this occurs, when the cycle collector reads this hash table and attempts to do a virtual method on this binding a crash will occur. This...