Miscellaneous memory safety hazards (rv:41.0 / rv:38.3) — 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...

Certificate verification bypass through the HTTP/2 Alt-Svc header — Mozilla

Security researcher Muneaki Nishimura discovered a flaw in the Mozilla's HTTP Alternative Services implementation. If an Alt-Svc header is specified in the HTTP/2 response, SSL certificate verification can be bypassed for the specified alternate server. As a result of this, warnings of invalid SS...

Cookie injection through Proxy Authenticate responses — Mozilla

Security researcher Xiaofeng Zheng of the Blue Lotus Team at Tsinghua University reported reported that a Web Proxy returning a 407 Proxy Authentication response with a Set-Cookie header could inject cookies into the originally requested domain. This could be used for session-fixation attacks. Th...

Incorrect IDNA domain name matching for wildcard certificates — Mozilla

Security researcher Christian Heimes reported that the Network Security Services NSS library does not handle IDNA domain prefixes according to RFC 6125 for wildcard certificates. This leads to improper wildcard matching of domains when they should not be matched in compliance with the...

Miscellaneous memory safety hazards (rv:26.0 / rv:24.2) — 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...

Miscellaneous Network Security Services (NSS) vulnerabilities — Mozilla

Mozilla has updated the version of Network Security Services NSS library used in Mozilla projects to NSS 3.15.3 with the exception of ESR17-based releases, which have been updated to NSS 3.14.5. This addresses several moderate to critical rated networking security issues...

Writing to cycle collected object during image decoding — Mozilla

Mozilla community member Ezra Pool reported a potentially exploitable crash on extremely large pages. This was caused when a cycle collected image object was released on the wrong thread during decoding, creating a race condition...

Use-after-free in Animation Manager during stylesheet cloning — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a use-after-free problem in the Animation Manager during the cloning of stylesheets. This can lead to a potentially exploitable crash...

Same-origin bypass with web workers and XMLHttpRequest — Mozilla

Mozilla community member Federico Lanusse reported a mechanism where a web worker can violate same-origin policy and bypass cross-origin checks through XMLHttpRequest. This could allow for cross-site scripting XSS attacks by web workers...

Bypass of SOW protections allows cloning of protected nodes — Mozilla

Security researcher Cody Crews reported a mechanism to use the cloneNode method to bypass System Only Wrappers SOW and clone a protected node. This allows violation of the browser's same origin policy and could also lead to privilege escalation and the execution of arbitrary code...

WebGL crash with Mesa graphics driver on Linux — Mozilla

Security researcher miaubiz used the Address Sanitizer tool to discover a crash in WebGL rendering when memory is freed that has not previously been allocated. This issue only affects Linux users who have Intel Mesa graphics drivers. The resulting crash could be potentially exploitable...

Buffer Overflow in Canvas — Mozilla

Security researcher miaubiz used the Address Sanitizer tool to discover a buffer overflow in Canvas when specific bad height and width values were given through HTML. This could lead to a potentially exploitable crash...

Privilege escalation through plugin objects — Mozilla

Security researcher Mariusz Mlynski reported that it is possible to open a chrome privileged web page through plugin objects through interaction with SVG elements. This could allow for arbitrary code execution...

URL spoofing in addressbar during page loads — Mozilla

Security researcher Masato Kinugawa found a flaw in which the displayed URL values within the addressbar can be spoofed by a page during loading. This allows for phishing attacks where a malicious page can spoof the identify of another site...

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...

Miscellaneous memory safety hazards (rv:7.0 / rv:1.9.2.23) — 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...

Miscellaneous memory safety hazards (rv:1.9.2.7/ 1.9.1.11) — 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...

Firefox allows Refresh header to redirect to javascript: URIs — Mozilla

Mozilla community member Michael reported that when a server responds with a Refresh header containing a javascript: URI, Firefox will redirect to the javascript: URI. If an attacker could inject a Refresh header into a server response, or could control the value that a site places in the Refresh...

BOM characters, low surrogates stripped from JavaScript before execution — Mozilla

Microsoft developer Dave Reed reported that certain BOM characters are stripped from JavaScript code before it is executed. This can lead to code, which would otherwise be treated as part of a quoted string, to be executed. The issue could potentially be used by an attacker to bypass or evade...

Security Vulnerabilities fixed in Firefox ESR 78.3 — Mozilla

By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site the one suffering from the open redirect rather than the site the file was actually downloaded from. Firefox sometimes ran the onload...

Security Vulnerabilities fixed in Thunderbird 78.2 — Mozilla

If Thunderbird 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...

Same-origin policy violation using local HTML file and saved shortcut file — Mozilla

Security researcher Abdulrahman Alqabandi reported that when a local HTML file resides in the same directory as a malicious local shortcut file, the shortcut can be called by the local page to allow the page to read the contents of local files or directories or to load an arbitrary website in...

Firefox Health Reports could accept events from untrusted domains — Mozilla

Mozilla engineer Mark Goodwin discovered that the Firefox Health Report about:healthreport accepts certain events from any content document present in the remote-report iframe. If there were another vulnerability that allowed the injection of web content into the Firefox Health Report iframe, thi...

Trailing whitespace in IP address hostnames can bypass same-origin policy — Mozilla

Security researcher Michał Bentkowski reported that adding white-space characters to hostnames that are IP addresses can bypass same-origin policy. This flaw was caused by trailing whitespaces being evaluated differently when parsing IP addresses instead of alphanumeric hostnames. This could lead...

Add-on notification bypass through data URLs — Mozilla

Security researcher Bas Venis reported a mechanism where add-ons could be installed from a different source than user expectations. Normally, when a user enters the URL to an add-on directly in the addressbar, warning prompts are bypassed because it is the result of direct user action. He...

Mozilla Content Security Policy allows for asterisk wildcards in violation of CSP specification — Mozilla

Mozilla security engineer Christoph Kerschbaumer reported a discrepancy in Mozilla's implementation of Content Security Policy and the CSP specification. The specification states that blob:, data:, and filesystem: URLs should be excluded in case of a wildcard when matching source expressions but...

Out-of-bounds write with Updater and malicious MAR file — Mozilla

Security researcher Holger Fuhrmannek reported that if the Updater opens a MAR format file with a specially crafted name, an out-of-bounds write will occur. This can lead to a potentially exploitable crash but requires that the malicious MAR format file be present on the local system and the...

Local files or privileged URLs in pages can be opened into new tabs — Mozilla

Security researcher Jann Horn reported that when Mozilla Foundation Security Advisory 2015-25 was fixed in Firefox 37, an error was made that caused the fix to not be applied to Firefox 38, effectively causing the bug to be unfixed in Firefox 38 and Firefox ESR38 once it shipped. As Armin Ebert...

Use-after-free when using the Fluendo MP3 GStreamer plugin — Mozilla

Security researcher Aki Helin reported a use-after-free when playing certain MP3 format audio files on the web using the Fluendo MP3 plugin for GStreamer on Linux. This is due to a flaw in handling certain MP3 files by the plugin and its interaction with Mozilla code. This can lead to a potential...

Out-of-bounds read and write while rendering SVG content — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to report an out-of-bounds read and an out-of-bounds write when rendering an improperly formatted SVG graphic. This could potentially allow the attacker to read uninitialized memory...

Local files or privileged URLs in pages can be opened into new tabs — Mozilla

Security researcher Armin Ebert reported that opening hyperlinks on a page with the mouse and specific keyboard key combinations could allow a Chrome privileged URL to be opened without context restrictions being preserved. This could also allow for local files or resources from a known location ...

CSP leaks redirect data via violation reports — Mozilla

Security researcher Muneaki Nishimura discovered that Content Security Policy CSP violation reports triggered by a redirect did not remove path information as required by the CSP specification. This potentially reveals information about the redirect that would not otherwise be known to the origin...

Buffer overflow during Web Audio buffering for playback — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG discovered a buffer overflow during interaction with the Web Audio buffer for playback because of an error in the the amount of allocated memory for buffers. This leads to a potentially exploitable crash with some audi...

Use-after-free in the Text Track Manager for HTML video — Mozilla

Using the Address Sanitizer tool, security researcher Abhishek Arya Inferno of the Google Chrome Security Team found a use-after-free in the Text Track Manager while processing HTML video. This was caused by inconsistent garbage collection of Text Track Manager variables and results in a...

Privilege escalation through Mozilla Maintenance Service Installer — Mozilla

Security researcher Ash reported an issue affected the Mozilla Maintenance Service on Windows systems. The Mozilla Maintenance Service installer writes to a temporary directory created during the update process which is writable by users. If malicious DLL files are placed within this directory...

Buffer overflow when using non-XBL object as XBL — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover a buffer overflow when a script uses a non-XBL object as an XBL object because the XBL status of the object is not properly validated. The resulting memory corruption is...

Content Security Policy for data: documents not preserved by session restore — Mozilla

Security researcher Nicolas Golubovic reported that the Content Security Policy CSP of data: documents was not saved as part of session restore. If an attacker convinced a victim to open a document from a data: URL injected onto a page, this can lead to a Cross-Site Scripting XSS attack. The targ...

Out-of-bounds read/write through neutering ArrayBuffer objects — Mozilla

Security researcher Jüri Aedla, via TippingPoint's Pwn2Own contest, reported that TypedArrayObject does not handle the case where ArrayBuffer objects are neutered, setting their length to zero while still in use. This leads to out-of-bounds reads and writes into the JavaScript heap, allowing for...

Incorrect use of discarded images by RasterImage — Mozilla

Fredrik 'Flonka' Lönnqvist discovered an issue with image decoding in RasterImage caused by continued use of discarded images. This could allow for the writing to unowned memory and a potentially exploitable crash...

Uninitialized data in IonMonkey — Mozilla

Software developer Dan Gohman of Google reported uninitialized data and variables in the IonMonkey Javascript engine when running the engine in Valgrind mode. This could be combined with additional exploits to allow the reading and use of previously allocated memory in some circumstances...

XrayWrappers can be bypassed to run user defined methods in a privileged context — Mozilla

Mozilla security researcher mozbugra4 reported that XrayWrappers can be bypassed to call content-defined toString and valueOf methods through DefaultValue. This can lead to unexpected behavior when privileged code acts on the incorrect values...

Local privilege escalation through Mozilla Maintenance Service — Mozilla

Security researcher Seb Patane reported an issue with the Mozilla Maintenance Service on Windows. This issue allows unprivileged users to local privilege escalation through the system privileges used by the service when interacting with local malicious software. This allows the user to bypass...

AutoWrapperChanger fails to keep objects alive during garbage collection — Mozilla

Mozilla developer Olli Pettay discovered that the AutoWrapperChanger class fails to keep some javascript objects alive during garbage collection. This can lead to an exploitable crash allowing for arbitrary code execution...

Improper character decoding in HZ-GB-2312 charset — Mozilla

Security researcher Masato Kinugawa found when HZ-GB-2312 charset encoding is used for text, the "" character will destroy another character near the chunk delimiter. This can lead to a cross-site scripting XSS attack in pages encoded in HZ-GB-2312...

top object and location property accessible by plugins — Mozilla

Security researcher Mariusz Mlynski reported that the location property can be accessed by binary plugins through top.location and top can be shadowed by Object.defineProperty as well. This can allow for possible cross-site scripting XSS attacks through plugins...

Continued access to initial origin after setting document.domain — Mozilla

Security researcher Collin Jackson reported a violation of the HTML5 specifications for document.domain behavior. Specified behavior requires pages to only have access to windows in a new document.domain but the observed violation allowed pages to retain access to windows from the page's initial...

Incorrect site SSL certificate data display — Mozilla

Security researcher Mark Poticha reported an issue where incorrect SSL certificate information can be displayed on the addressbar, showing the SSL data for a previous site while another has been loaded. This is caused by two onLocationChange events being fired out of the expected order, leading t...

Content Security Policy inline-script bypass — Mozilla

Security researcher Adam Barth found that inline event handlers, such as onclick, were no longer blocked by Content Security Policy's CSP inline-script blocking feature. Web applications relying on this feature of CSP to protect against cross-site scripting XSS were not fully protected...

Uninitialized memory appended when encoding icon images may cause information disclosure — Mozilla

Mozilla developer Tim Abraldes reported that when encoding images as image/vnd.microsoft.icon the resulting data was always a fixed size, with uninitialized memory appended as padding beyond the size of the actual image. This is the result of mImageBufferSize in the encoder being initialized with...

XSLT generate-id() function heap address leak — Mozilla

Chris Evans of the Chrome Security Team reported that the XSLT generate-id function returned a string that revealed a specific valid address of an object on the memory heap. It is possible that in some cases this address would be valuable information that could be used by an attacker while...