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...

Out of bounds write in NSPR — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team reported an out of bounds write in the Netscape Portable Runtime NSPR leading to a potentially exploitable crash or code execution. This issue is fixed in NSPR version 4.10.6...

WebGL content injection from one domain to rendering in another — Mozilla

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...

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...

Miscellaneous memory safety hazards (rv:23.0 / rv:17.0.8) — 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...

Directory traversal in resource: protocol — Mozilla

Security researcher Soroush Dalili reported that the resource: protocol could be exploited to allow directory traversal on Windows and the potential loading of resources from non-permitted locations. The impact would depend on whether interesting files existed in predictable locations in a useful...

Crash on Mac using fuzzed font in data: URL — Mozilla

Security researcher Marc Schoenefeld reported that a specially crafted font could be applied to a document and cause a crash on Mac systems. The crash showed signs of memory corruption and presumably could be used by an attacker to execute arbitrary code on a victim's computer...

Use-after-free error in NodeIterator — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative an error in Mozilla's implementation of NodeIterator in which a malicious NodeFilter could be created which would detach nodes from the DOM tree while it was being traversed. The use of a detached and subsequently...

XMLDocument::load() doesn't check nsIContentPolicy — Mozilla

Mozilla community member Wladimir Palant reported that XML documents were failing to call certain security checks when loading new content. This could result in certain resources being loaded that would otherwise violate security policies set by the browser or installed add-ons...

GeckoActiveXObject exception messages can be used to enumerate installed COM objects — Mozilla

Security researcher Gregory Fleischer reported that the exception messages generated by Mozilla's GeckoActiveXObject differ based on whether or not the requested COM object's ProgID is present in the system registry. A malicious site could use this vulnerability to enumerate a list of COM objects...

Location bar spoofing vulnerabilities — Mozilla

Security researcher Jonathan Morgan reported that when a page loaded over an insecure protocol, such as http: or file:, sets its document.location to a https: URL which responds with a 204 status and empty response body, the insecure page will receive SSL indicators near the location bar, but wil...

Arbitrary domain cookie access by local file: resources — Mozilla

Security researcher Gregory Fleischer reported that local resources loaded via the file: protocol can access any domain's cookies which have been saved on a user's machine. Fleischer demonstrated that a local document's domain was being calculated incorrectly from its URL. If a victim could be...

XML data theft via RDFXMLDataSource and cross-domain redirect — Mozilla

Mozilla security researcher Georgi Guninski reported that a website could use nsIRDFService and a cross-domain redirect to steal arbitrary XML data from another domain, a violation of the same-origin policy. This vulnerability could be used by a malicious website to steal private data from users...

Remote site run as local file via Windows URL shortcut — Mozilla

Mozilla community member Geoff reported that URL shortcut files on Windows for example, saved IE favorites could be interpreted as if they were in the local file context when opened by Firefox, although the referenced remote content would be downloaded and displayed. Scripts loaded from the remot...

Possible information disclosure in BMP decoder — Mozilla

Security researcher Gynvael Coldwind of Vexillium crediting help from udevd and porneL demonstrated that BMP images could be used to reveal small chunks of uninitialized memory that might contain sensitive data from other pages or other programs, and that this data could be extracted from the ima...

Possible file stealing through sftp protocol — Mozilla

On Linux machines with gnome-vfs support the smb: and sftp: URI schemes are available in Firefox. Georgi Guninski showed that if an attacker can store the attack page in a mutually accessible location on the target server /tmp perhaps and lure the victim into loading it, the attacker could...

UniversalBrowserRead privilege escalation — Mozilla

shutdown reports that scripts granted the UniversalBrowserRead privilege can leverage that into the equivalent of the far more powerful UniversalXPConnect since they are allowed to "read" into a privileged context. This allows the attacker the ability to run scripts with the full privilege of the...

JavaScript execution in mail when forwarding in-line — Mozilla

Georgi Guninski reports that forwarding mail in-line while using the default HTML "rich mail" editor will execute JavaScript embedded in the e-mail message. Forwarding mail in-line is not the default setting but it is easily accessed through the "Forward As" menu item...

Downloading executables with "Save Image As..." — Mozilla

By layering a transparent image link to an executable on top of a visible and presumably desirable image a malicious site might be able to convince some visitors to right-click and choose "Save image as..." from the context menu and fool them by giving them the executable instead. When the users...

Security Vulnerability fixed in Thunderbird 131.0.1, Thunderbird 128.3.1, Thunderbird 115.16.0 — Mozilla

An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines. We have had reports of this vulnerability being exploited in the wild...

Out-of-bounds write with WebGL shader — Mozilla

Security researcher Aral reported an out-of-bounds write when using the ANGLE graphics library, which is used for WebGL content on Windows systems. This crash occurs due to improper size checking while writing to an array during some WebGL shader operations...

Use-after-free and buffer overflow in Service Workers — Mozilla

Security researcher Looben Yang reported two issues discovered in Service Workers using Address Sanitizer...

WebRTC and LibVPX vulnerabilities found through code inspection — Mozilla

Security researcher Ronald Crane reported five "moderate" rated vulnerabilities affecting released code that were found through code inspection. These included the following issues in WebRTC: an integer underflow, a missing status check, race condition, and a use of deleted pointers to create new...

Lightweight themes on Firefox for Android do not verify a secure connection — Mozilla

Mozilla developer Margaret Leibovic reported when Firefox for Android installs lightweight themes, it does not check to verify that they are served over an HTTPS connection. Instead, themes can be installed over an unencrypted connection, which could allow for a man-in-the-middle MITM attack by...

Firefox allows for control characters to be set in cookies — Mozilla

Security researcher musicDespiteEverything reported an issue when ASCII code 11 for vertical tab is stored in a cookie in violation of RFC6265. This may result in incorrect cookie handling by servers, resulting in the potential ability to set cookie values and read cookie data from users in conce...

Out-of-bounds read with malformed MP3 file — Mozilla

Security researcher Aki Helin used the Address Sanitizer tool to discover an out-of-bounds read during playback of a malformed MP3 format audio file which switches sample formats. This could trigger a potentially exploitable crash or the reading of out-of-bounds memory content in some circumstanc...

IFRAME sandbox same-origin access through redirect — Mozilla

Mozilla developer Boris Zbarsky discovered an issue where network-level redirects cause an sandbox to forget its unique origin and behave as if the allow-same-origin keyword were applied. This allows the sandboxed content to access other content from the same origin without explicit approval...

Toolbar dialog customization event spoofing — Mozilla

Mozilla developers David Chan and Gijs Kruitbosch reported that it is possible to create a drag and drop event in web content which mimics the behavior of a chrome customization event. This can occur when a user is customizing a page or panel. This results in a limited ability to move UI icons...

Debugger can bypass XrayWrappers with JavaScript — Mozilla

Mozilla developer Boris Zbarsky discovered that the debugger will work with some objects while bypassing XrayWrappers. This could lead to privilege escalation if the victim used the debugger to interact with a malicious page...

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...

Calling scope for new Javascript objects can lead to memory corruption — Mozilla

Mozilla community member Ms2ger found a mechanism where a new Javascript object with a compartment is uninitialized could be entered through web content. When the scope for this object is called, it leads to a potentially exploitable crash...

Use after free mutating DOM during SetBody — Mozilla

Security researcher Nils used the Address Sanitizer to discover a use-after-free problem when the Document Object Model is modified during a SetBody mutation event. This causes a potentially exploitable crash...

Potentially exploitable crash in the YARR regular expression library — Mozilla

Security researcher Aki Helin reported a crash in the YARR regular expression library that could be triggered by javascript in web content...

Integer underflow when using JavaScript RegExp — Mozilla

Mark Kaplan reported a potentially exploitable crash due to integer underflow when using a large JavaScript RegExp expression. We would also like to thank Mark for contributing the fix for this problem...

Crash caused by corrupted JPEG image — Mozilla

Security researcher Jordi Chancel reported that a JPEG image could be constructed that would be decoded incorrectly, causing data to be written past the end of a buffer created to store the image. An attacker could potentially craft such an image that would cause malicious code to be stored in...

Location bar SSL spoofing using network error page — Mozilla

Google security researcher Michal Zalewski reported that when a window was opened to a site resulting in a network or certificate error page, the opening site could access the document inside the opened window and inject arbitrary content. An attacker could use this bug to spoof the location bar...

Miscellaneous memory safety hazards (rv:1.9.2.9/ 1.9.1.12) — 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...

Cross-origin data disclosure via Web Workers and importScripts — Mozilla

Security researcher Yosuke Hasegawa reported that the Web Worker method importScripts can read and parse resources from other domains even when the content is not valid JavaScript. This is a violation of the same-origin policy and could be used by an attacker to steal information from other sites...

Privilege escalation via chrome window.opener — Mozilla

Security researcher David James reported that a content window which is opened by a chrome window retains a reference to the chrome window via the window.opener property. Using this reference, content in the new window can access functions inside the chrome window, such as eval, and use these...

Location bar and SSL indicator spoofing via window.open() on invalid URL — Mozilla

Security researcher Juan Pablo Lopez Yacubian reported that an attacker could call window.open on an invalid URL which looks similar to a legitimate URL and then use document.write to place content within the new document, appearing to have come from the spoofed location. Additionally, if the...

SSL tampering via non-200 responses to proxy CONNECT requests — Mozilla

Microsoft security researchers Shuo Chen, Ziqing Mao, Yi-Min Wang, and Ming Zhang reported that when a CONNECT request is sent to a proxy server and a non-200 response is returned, then the body of the response is incorrectly rendered within the context of the request Host: header. An active...

Crashes with evidence of memory corruption (rv:1.9.0.4/1.8.1.18) — Mozilla

Mozilla developers identified and fixed several stability bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these crashes showed evidence of memory corruption under certain circumstances and we presume that with enough effort at least some of these could be...

Privilege escalation via XPCnativeWrapper pollution — Mozilla

Mozilla security researcher mozbugra4 reported a series of vulnerabilities by which page content can pollute XPCNativeWrappers and have arbitrary code run with chrome privileges. One variant reported by mozbugra4 only affected Firefox 2...

Java socket connection to any local port via LiveConnect — Mozilla

Security researcher Gregory Fleischer demonstrated that web content fetched via the jar: protocol can use Java via LiveConnect to open socket connections to arbitrary ports on the user's machine "localhost". The issue is caused by improper parsing of the content origin passed from the browser to...

Web browsing history and forward navigation stealing — Mozilla

Mozilla contributor David Bloom reported a vulnerability in the way images are treated by the browser when a user leaves a page which utilizes designMode frames. The reported issue can be used to steal a user's navigation history, forward navigation information, and crash the user's browser. The...

jar: URI scheme XSS hazard — Mozilla

The jar: URI scheme was introduced as a mechanism to support digitally signed web pages, enabling web sites to load pages packaged in zip archives containing signatures in java-archive format...

File input focus stealing vulnerability — Mozilla

A user on the Sla.ckers.org forums named hong reported that a file upload control could be filled programmatically by switching page focus to the label before a file upload form control for selected keyboard events. An attacker could use this trick to steal files from the users' computer if the...

URIs with invalid %-encoding mishandled by Windows — Mozilla

On Windows XP with Internet Explorer 7 installed several "web related" URI schemes do not launch the registered protocol-handler if the URI contains an invalid %-encoded sequence. This was initially reported by Billy Rios and Nate McFeters with additional investigation by Secunia. A patch that...

Unescaped URIs passed to external programs — Mozilla

Jesper Johansson pointed out that Mozilla did not percent-encode spaces and double-quotes in URIs handed off to external programs for handling, which can cause the receiving program to mistakenly interpret a single URI as multiple arguments. The danger depends on the arguments supported by the...

Remote code execution by launching Firefox from Internet Explorer — Mozilla

Internet Explorer calls registered URL protocols without escaping quotes and may be used to pass unexpected and potentially dangerous data to the application that registers that URL Protocol...