Security vulnerabilities fixed in Firefox 50.0.1 — Mozilla

Redirection from an HTTP connection to a data: URL assigns the referring site's origin to the data: URL in some circumstances. This can result in same-origin violations against a domain if it loads resources from malicious sites. Cross-origin setting of cookies has been demonstrated without the...

Errors in mp_div and mp_exptmod cryptographic functions in NSS — Mozilla

Security researcher Hanno Böck reported that calculations with mpdiv and mpexptmod in Network Security Services NSS can produce wrong results in some circumstances. These functions are used within NSS for a variety of cryptographic division functions, leading to potential cryptographic weaknesses...

Mixed content WebSocket policy bypass through workers — Mozilla

Mozilla developer Ehsan Akhgari reported a mechanism through which a web worker could be used to bypass secure requirements for WebSockets when workers are used to create WebSockets. This allows for the bypassing of mixed content WebSocket policy...

Vulnerabilities found through code inspection — Mozilla

Security researcher Ronald Crane reported eight vulnerabilities affecting released code that were found through code inspection. These included several potential memory safety issues resulting from the use of snprintf, one use of unowned memory, one use of a string without overflow checks, and fi...

Inconsistent video sharing within iframe — Mozilla

Mozilla developers Eric Shepherd and Jan-Ivar Bruaroey reported issues with privacy and video sharing using WebRTC. Once video sharing has started within a WebRTC session running within an , video will continue to be shared even if the user selects the Stop Sharing" button in the controls. The...

Miscellaneous memory safety hazards (rv:31.0 / rv:24.7) — 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...

Spoofing attack on WebRTC permission prompt — Mozilla

Mozilla developer Ehsan Akhgari reported a spoofing attack where the permission prompt for a WebRTC session can appear to be from a different site than its actual originating site if a timed navigation occurs during the prompt generation. This allows an attacker to potentially gain access to the...

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...

Miscellaneous memory safety hazards (rv:20.0 / rv:17.0.5) — 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...

Buffer overflow while rendering GIF images — Mozilla

Security researcher Atte Kettunen from OUSPG used the Address Sanitizer tool to discover a buffer overflow while rendering GIF format images. This issue is potentially exploitable and could lead to arbitrary code execution...

Fixes for Location object issues — Mozilla

Mozilla has fixed a number of issues related to the Location object in order to enhance overall security. Details for each of the current fixed issues are below...

XSS through data: URLs — Mozilla

Mozilla security researcher mozbugra4 reported a cross-site scripting XSS attack through the context menu using a data: URL. In this issue, context menu functionality "View Image", "Show only this frame", and "View background image" are disallowed in a javascript: URL but allowed in a data: URL,...

Buffer overflow in ClearKey Content Decryption Module (CDM) during video playback — Mozilla

An anonymous security researcher working with Trend Micro's Zero Day Initiative reported a buffer overflow in the ClearKey Content Decryption Module CDM used by the Encrypted Media Extensions EME API. This vulnerability can be triggered using a malformed video file due to incorrect error handling...

Out-of-bounds read during XML parsing in Expat library — Mozilla

Security researcher Gustavo Grieco reported a potential out-of-bounds read parsing malformed XML data during character conversion. This is due to a bug in the Expat library, which is used in Firefox. This could allow an attacker to read other inaccessible memory...

Use-after-free in WebRTC when datachannel is used after being destroyed — Mozilla

Security researcher Looben Yang reported a use-after-free error in WebRTC that occurs due to timing issues in WebRTC when closing channels. WebRTC may still believe is has a datachannel open after another WebRTC function has closed it. This results in attempts to use the now destroyed datachannel...

Out-of-bounds read in Web Audio audio timeline — Mozilla

Security researcher Holger Fuhrmannek discovered an out-of-bounds read during the creation of an audio timeline in Web Audio. This results in a crash and could allow for the reading of random memory values...

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...

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...

Execution of unmapped memory through onreadystatechange event — Mozilla

Security researcher Nils reported that specially crafted web content using the onreadystatechange event and reloading of pages could sometimes cause a crash when unmapped memory is executed. This crash is potentially exploitable...

Miscellaneous memory safety hazards (rv:22.0 / rv:17.0.7) — 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...

Memory corruption found using Address Sanitizer — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a series of use-after-free, out of bounds read, and invalid write problems rated as moderate to critical as security issues in shipped software. Some of these issues are...

Phishing on HTTPS connection through malicious proxy — Mozilla

Google security researcher Michal Zalewski reported an issue where the browser displayed the content of a proxy's 407 response if a user canceled the proxy's authentication prompt. In this circumstance, the addressbar will continue to show the requested site's address, including HTTPS addresses...

Code execution through javascript: URLs — Mozilla

Mozilla security researcher mozbugra4 reported a arbitrary code execution attack using a javascript: URL. The Gecko engine features a JavaScript sandbox utility that allows the browser or add-ons to safely execute script in the context of a web page. In certain cases, javascript: URLs are execute...

Potential XSS via multibyte content processing errors — Mozilla

Anne van Kesteren of Opera Software found a multi-octet encoding issue where certain octets will destroy the following octets in the processing of some multibyte character sets. This can leave users vulnerable to cross-site scripting XSS attacks on maliciously crafted web pages...

SVG issues found with Address Sanitizer — Mozilla

Security researcher Atte Kettunen from OUSPG found two issues with Firefox's handling of SVG using the Address Sanitizer tool. The first issue, critically rated, is a use-after-free in SVG animation that could potentially lead to arbitrary code execution. The second issue is rated moderate and is...

Crashes with evidence of memory corruption (rv:1.9.0.9) — 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...

XMLHttpRequest allows reading HTTPOnly cookies — Mozilla

Developer and Mozilla community member Wladimir Palant reported that cookies marked HTTPOnly were readable by JavaScript via the XMLHttpRequest.getResponseHeader and XMLHttpRequest.getAllResponseHeaders APIs. This vulnerability bypasses the security mechanism provided by the HTTPOnly flag which...

Crashes with evidence of memory corruption (rv:1.8) — Mozilla

As part of the Firefox 1.5 release we fixed several crash bugs to improve the stability of the product. Some of these crashes showed evidence of memory corruption that we presume could be exploited to run arbitrary code and have been applied to the Firefox 1.0.x and Mozilla Suite 1.7.x releases...

Security Vulnerabilities fixed in Firefox ESR 115.10 — Mozilla

GetBoundName could return the wrong version of an object when JIT optimizations were applied. In some code patterns the JIT incorrectly optimized switch statements and generated code with out-of-bounds-reads. The JIT created incorrect code for arguments in certain cases. This led to potential...

Security Vulnerabilities fixed in Thunderbird 78 — Mozilla

When %2F was present in a manifest URL, Thunderbird's AppCache behavior may have become confused and allowed a manifest to be served from a subdirectory. This could cause the appcache to be used to service requests for the top level directory. A VideoStreamEncoder may have been freed in a race...

Security vulnerabilities fixed in Firefox ESR 45.8 — Mozilla

JIT-spray targeting asm.js combined with a heap spray allows for a bypass of ASLR and DEP protections leading to potential memory corruption attacks. A crash triggerable by web content in which an ErrorResult references unassigned memory due to a logic error. The resulting crash may be exploitabl...

Scripts on marquee tag can execute in sandboxed iframes — Mozilla

Security researcher Nikita Arykov reported that JavaScript event handler attributes on a tag will execute inside a sandboxed iframe that does not have the allow-scripts flag set. This could result in a cross-site scripting XSS vulnerability in a site that depends on the iframe sandbox for...

Java applets bypass CSP protections — Mozilla

Mozilla engineer Matt Wobensmith reported that Content Security Policy CSP does not block the loading of cross-domain Java applets when specified by policy. This is because the Java applet is loaded by the Java plugin, which then mediates all network requests without checking against CSP. This...

Out-of-bounds read in HTML parser following a failed allocation — Mozilla

Security researcher Ronald Crane reported an out-of-bounds read following a failed allocation in the HTML parser while working with unicode strings. This can also affect the parsing of XML and SVG format data. This leads to a potentially exploitable crash...

Cross-site reading attack through data and view-source URIs — Mozilla

Security researcher Tsubasa Iinuma reported a mechanism to violate same-origin policy to content using data: and view-source: URIs to confuse protections and bypass restrictions. This resulted in the ability to read data from cross-site URLs and local files...

SVG filters can lead to information disclosure — Mozilla

Security researcher Paul Stone of Context Information Security discovered that timing differences in the processing of SVG format images with filters could allow for pixel values to be read. This could potentially allow for text values to be read across domains, leading to information disclosure...

Homograph domain spoofing in .com, .net and .name — Mozilla

Security researcher 3ric Johanson reported in discussions with Richard Newman and Holt Sorenson that Verisign's prevention measures for homograph attacks using Internationalized Domain Names IDN were insufficiently rigorous, and this led to a limited possibility for domain spoofing in Firefox...

Cross-site scripting (XSS) using timed history navigations — Mozilla

Security researcher Mariusz Mlynski reported a method to use browser navigations through history to load an arbitrary website with that page's baseURI property pointing to another site instead of the seemingly loaded one. The user will continue to see the incorrect site in the addressbar of the...

Bypass of tab-modal dialog origin disclosure — Mozilla

Security researcher shutdown reported a method for removing the origin indication on tab-modal dialog boxes in combination with browser navigation. This could allow an attacker's dialog to overlay a page and show another site's content. This can be used for phishing by allowing users to enter dat...

Chrome Object Wrapper (COW) bypass through changing prototype — Mozilla

Security researcher Mariusz Mlynski reported that it is possible to change the prototype of an object and bypass Chrome Object Wrappers COW to gain access to chrome privileged functions. This could allow for arbitrary code execution...

Event manipulation in plugin handler to bypass same-origin policy — Mozilla

Mozilla security researcher Jesse Ruderman reported that events in the plugin handler can be manipulated by web content to bypass same-origin policy SOP restrictions. This can allow for clickjacking on malicious web pages...

DOS and crash with full screen and history navigation — Mozilla

Security researcher Soroush Dalili reported that a combination of invoking full screen mode and navigating backwards in history could, in some circumstances, cause a hang or crash due to a timing dependent use-after-free pointer reference. This crash may be potentially exploitable...

SPDY information disclosure — Mozilla

Security researchers Thai Duong and Juliano Rizzo reported that SPDY's request header compression leads to information leakage, which can allow the extraction of private data such as session cookies, even over an encrypted SSL connection...

Location object can be shadowed using Object.defineProperty — Mozilla

Security researcher Mariusz Mlynski reported that it is possible to shadow the location object using Object.defineProperty. This could be used to confuse the current location to plugins, allowing for possible cross-site scripting XSS attacks...

Out of bounds read in QCMS — Mozilla

Google developer Tony Payne reported an out of bounds OOB read in QCMS, Mozilla’s color management library. With a carefully crafted color profile portions of a user's memory could be incorporated into a transformed image and possibly deciphered...

Spoofing issue with location — Mozilla

Security researcher Mariusz Mlynski reported an issue with spoofing of the location property. In this issue, calls to history.forward and history.back are used to navigate to a site while displaying the previous site in the addressbar but changing the baseURI to the newer site. This can be used f...

Potential memory corruption during font rendering using cairo-dwrite — Mozilla

Security research firm iDefense reported that researcher wushi of team509 discovered a memory corruption on Windows Vista and Windows 7 systems with hardware acceleration disabled or using incompatible video drivers. This is created by using cairo-dwrite to attempt to render fonts on an unsupport...

Potential Memory Corruption When Decoding Ogg Vorbis files — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative the possibility of memory corruption during the decoding of Ogg Vorbis files. This can cause a crash during decoding and has the potential for remote code execution...

nsSVGValue out-of-bounds access — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative that a flaw in the Mozilla SVG implementation could result in an out-of-bounds memory access if SVG elements were removed during a DOMAttrModified event handler...

loadSubScript unwraps XPCNativeWrapper scope parameter — Mozilla

David Rees reported that the JSSubScriptLoader a feature used by some add-ons was "unwrapping" XPCNativeWrappers when they were used as the scope parameter to loadSubScript. Without the protection of the wrappers the add-on could be vulnerable to privilege escalation attacks from malicious web...