Network Security Services (NSS) vulnerabilities — Mozilla

Mozilla has updated the version of Network Security Services NSS library used in Firefox to NSS 3.23. This addresses four moderate rated networking security issues reported by Mozilla engineers Tyson Smith and Jed Davis...

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...

Incorrect URL displayed in addressbar through drag and drop — Mozilla

Security researcher Mario Gomes andresearch firm Code Audit Labs reported a mechanism to short-circuit page loads through drag and drop to the addressbar by canceling the page load. This causes the address of the previously site entered to be displayed in the addressbar instead of the currently...

Invalid frees causes heap corruption in gfxImageSurface — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG found a heap corruption in gfxImageSurface which allows for invalid frees and possible remote code execution. This happens due to float error, resulting from graphics values being passed through different number system...

Overly permissive IPv6 literal syntax — Mozilla

For historical reasons Firefox has been generous in its interpretation of web addresses containing square brackets around the host. If this host was not a valid IPv6 literal address, Firefox attempted to interpret the host as a regular domain name. Gregory Fleischer reported that requests made...

Cross-origin data theft using canvas and Windows D2D — Mozilla

Mozilla developer Bas Schouten reported that the introduction of the "Azure" graphics back-end on Windows in Firefox 7 re-introduced the cross-origin data theft issue reported by nasalislarvatus3000 as described in MFSA 2011-29...

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...

Security Vulnerabilities fixed in Firefox ESR 102.12 — Mozilla

The error page for sites with invalid TLS certificates was missing the activation-delay Firefox uses to protect prompts and permission dialogs from attacks that exploit human response time delays. If a malicious page elicited user clicks in precise locations immediately before navigating to a sit...

Security Vulnerabilities fixed in Firefox ESR 78.8 — Mozilla

As specified in the W3C Content Security Policy draft, when creating a violation report, "User agents need to ensure that the source file is the URL requested by the page, pre-redirects. If that’s not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage."...

Security Vulnerabilities fixed in Thunderbird 68.11 — Mozilla

By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. WebRTC used the memory address of a class instance as a connection identifier. Unfortunately, this value is...

Security vulnerabilities fixed in Thunderbird 45.6 — Mozilla

Use-after-free while manipulating DOM events and removing audio elements due to errors in the handling of node adoption. Event handlers on marquee elements were executed despite a strict Content Security Policy CSP that disallowed inline JavaScript. Memory corruption resulting in a potentially...

Out-of-bounds write with WebM video — Mozilla

Using the Address Sanitizer tool, security researcher Abhishek Arya Inferno of the Google Chrome Security Team found an out-of-bounds write when buffering WebM format video containing frames with invalid tile sizes. This can lead to a potentially exploitable crash during WebM video playback...

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...

Use-after-free with SMIL Animation Controller — Mozilla

Security researcher Nils used the Address Sanitizer to discover a use-after-free problem with the SMIL Animation Controller when interacting with and rendering improperly formed web content. This causes a potentially exploitable crash...

Use-after-free with video and onresize event — Mozilla

Security researcher Nils reported a use-after-free when resizing video while playing. This could allow for arbitrary code execution...

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...

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...

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,...

Potential site identity spoofing when loading RSS and Atom feeds — Mozilla

Security researcher Jeroen van der Gun reported that if RSS or Atom XML invalid content is loaded over HTTPS, the addressbar updates to display the new location of the loaded resource, including SSL indicators, while the main window still displays the previously loaded content. This allows for...

Security Vulnerabilities fixed in Firefox ESR 68.12 — Mozilla

If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to ...

Read-after-free in WebRTC — Mozilla

Security researcher Mitchell Harper discovered a read-after-free in WebRTC due to the way tracks are handled. This results in a either a potentially exploitable crash or incorrect WebRTC behavior...

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...

Use-after-free in synthetic mouse movement — 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 in the functions for synthetic mouse movement handling. Security researcher Atte Kettunen from OUSPG also...

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...

Use-after-free in nsImageLoadingContent — Mozilla

Security researcher Nils reported a use-after-free in nsImageLoadingContent when content script is executed. This could allow for arbitrary code execution...

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...

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...

GetProperty function can bypass security checks — Mozilla

Mozilla community member Alice White reported that when the GetProperty function is invoked through JSAPI, security checking can be bypassed when getting cross-origin properties. This potentially allowed for arbitrary code execution...

Miscellaneous memory safety hazards (rv:14.0/ rv:10.0.6) — 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...

X-Frame-Options header ignored when duplicated — Mozilla

Bugzilla developer Frédéric Buclin reported that the "X-Frame-Options header is ignored when the value is duplicated, for example X-Frame-Options: SAMEORIGIN, SAMEORIGIN. This duplication occurs for unknown reasons on some websites and when it occurs results in Mozilla browsers not being protecte...

Use-after-free while replacing/inserting a node in a document — Mozilla

Security researcher Arthur Gerkis used the Address Sanitizer tool to find a use-after-free while replacing/inserting a node in a document. This use-after-free could possibly allow for remote code execution...

Page load short-circuit can lead to XSS — Mozilla

Security researchers Jordi Chancel and Eddy Bordi reported that they could short-circuit page loads to show the address of a different site than what is loaded in the window in the addressbar. Security researcher Chris McGowen independently reported the same flaw, and further demonstrated that th...

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...

<iframe> element exposed across domains via name attribute — Mozilla

Vitaly Nevgen reported that an attacker could replace a sub-frame in another domain's document by using the name attribute of the sub-frame as a form submission target. This can potentially allow for phishing attacks against users and violates the HTML5 frame navigation policy...

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...

Security Vulnerabilities fixed in Firefox ESR 78.2 — Mozilla

If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to ...

Security Vulnerabilities fixed in Firefox ESR 68.11 — Mozilla

By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. WebRTC used the memory address of a class instance as a connection identifier. Unfortunately, this value is...

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...

Buffer overflow rendering SVG with bidirectional content — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen found a buffer overflow during the rendering of SVG format graphics with directional content. This is caused by a flaw in directional-isolate processing and results in a potentially exploitable crash...

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...

Same-origin-policy violation using Service Workers with plugins — Mozilla

Jason Pang of OneSignal reported that service workers intercept responses to plugin network requests made through the browser. Plugins which make security decisions based on the content of network requests can have these decisions subverted if a service worker forges responses to those requests...

Use-after-free in NSS during SSL connections in low memory — Mozilla

Mozilla developer Eric Rescorla reported that a failed allocation during DHE and ECDHE handshakes would lead to a use-after-free vulnerability...

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...

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...

Double-free when using non-default memory allocators with a zero-length XHR — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team and Mozilla security developer Gary Kwong used the Address Sanitizer tool to discover a double-free error when sending a zero-length XmlHttpRequest XHR. This was due to errors in memory allocation when using different...

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...

Use-after-free during DOM interactions with SVG — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a use-after-free during cycle collection. This was found in interactions with the SVG content through the document object model DOM with animating SVG content. This leads to a...

Use-after-free while when manipulating certificates in the trusted cache — Mozilla

Security researchers Tyson Smith and Jesse Schwartzentruber used the Address Sanitizer tool while fuzzing to discover a use-after-free error resulting in a crash. This is a result of a pair of NSSCertificate structures being added to a trust domain and then one of them is removed while they are...

Out of bounds read while decoding JPG images — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a fixed offset out of bounds read issue while decoding specifically formatted JPG format images. This causes a non-exploitable crash...