Security Vulnerabilities fixed in Firefox ESR 78.15 — Mozilla

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. Mozilla developers and community members Andreas Pehrson and Christian Holler reported memory safety bugs present in Firefox 92 and...

Security vulnerabilities fixed in - Thunderbird 68.2 — Mozilla

In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too early. A subsequent call to XMLGetCurrentLineNumber or XMLGetCurrentColumnNumber then resulted in a heap-based buffer over-read. When following the value's prototype chain, it...

Use-after-free when applying SVG effects — Mozilla

Security researcher Nils used the Address Sanitizer tool to discover a use-after-free vulnerability when applying effects to SVG elements. This results in a potentially exploitable crash...

File overwrite and privilege escalation through Mozilla Windows updater — Mozilla

Security researcher Frédéric Hoguin reported a mechanism where the Mozilla Windows updater could be used to overwrite arbitrary files. He found that files extracted by the updater from a MAR archive are not locked for writing and can be overwritten by other processes while the updater is running....

Buffer overflow in Brotli decompression — Mozilla

Security researcher Luke Li reported a pointer underflow bug in the Brotli library's decompression that leads to a buffer overflow. This results in a potentially exploitable crash when triggered...

Integer overflow allocating extremely large textures — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover an integer overflow when when allocating textures of extremely larges sizes during graphics operations. This results in a potentially exploitable crash when triggered...

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...

Buffer overflow parsing H.264 video with Linux Gstreamer — Mozilla

Security researcher Aki Helin used the Address Sanitizer tool to find a buffer overflow during video playback on Linux systems. This was due to a problem in older versions of the Gstreamer plugin during the parsing of H.264 formatted video. This issue could be used to induce a possibly exploitabl...

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 ...

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...

XMLHttpRequest crashes with some input streams — Mozilla

Security researcher Joe Vennix from Rapid7 reported that passing a JavaScript object to XMLHttpRequest that mimics an input stream will a crash. This crash is not exploitable and can only be used for denial of service attacks...

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...

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...

Out of bounds read during WAV file decoding — Mozilla

Security researcher Atte Kettunen from OUSPG reported an out of bounds read during the decoding of WAV format audio files for playback. This could allow web content access to heap data as well as causing a crash...

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...

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...

PreserveWrapper has inconsistent behavior — Mozilla

Mozilla developer Boris Zbarsky found that when PreserveWrapper was used in cases where a wrapper is not set, the preserved-wrapper flag on the wrapper cache is cleared. This could potentially lead to an exploitable crash...

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...

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...

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...

Memory corruption in str_unescape — Mozilla

Security researcher Scott Bell of Security-Assessment.com used the Address Sanitizer tool to discover a memory corruption in strunescape in the Javascript engine. This could potentially lead to arbitrary code execution...

defaultValue security checks not applied — Mozilla

Mozilla security researcher mozbugra4 reported a regression where security wrappers are unwrapped without doing a security check in defaultValue. This can allow for improper access to the Location object. In versions 15 and earlier of affected products, there was also the potential for arbitrary...

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...

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...

Frame scripts calling into untrusted objects bypass security checks — Mozilla

Mozilla security researcher mozbugra4 reported that frame scripts bypass XPConnect security checks when calling untrusted objects. This allows for cross-site scripting XSS attacks through web pages and Firefox extensions. The fix enables the Script Security Manager SSM to force security checks on...

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...

Potential XSS against sites using Shift-JIS — Mozilla

Yosuke Hasegawa reported that the Mozilla browser engine mishandled invalid sequences in the Shift-JIS encoding. When encountering an invalid pair Mozilla would turn the entire two-byte sequence into a single unknown character rather than an unknown character followed by a valid single-byte...

Buffer overflow and memory corruption using document.write — Mozilla

Security researcher Alexander Miller reported that passing an excessively long string to document.write could cause text rendering routines to end up in an inconsistent state with sections of stack memory being overwritten with the string data. An attacker could use this flaw to crash a victim's...

Integer Overflow in XSLT Node Sorting — Mozilla

Security researcher Martin Barbella reported via TippingPoint's Zero Day Initiative that an XSLT node sorting routine contained an integer overflow vulnerability. In cases where one of the nodes to be sorted contained a very large text value, the integer used to allocate a memory buffer to store...

Crashes with evidence of memory corruption (rv:1.9.1.6/ 1.9.0.16) — Mozilla

Mozilla developers and community members 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 ...

Crashes with evidence of memory corruption (rv:1.8.1.13) — 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 78.4 — Mozilla

A use-after-free bug in the usersctp library was reported upstream. We assume this could have led to memory corruption and a potentially exploitable crash. Mozilla developers and community members Jason Kratzer, Simon Giesecke, Philipp, and Christian Holler reported memory safety bugs present in...

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...

Security Vulnerabilities fixed in Thunderbird 68.9.0 — Mozilla

NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash. Mozilla developer Iain Ireland...

Security vulnerabilities fixed in Firefox ESR 60.4 — Mozilla

A buffer overflow and out-of-bounds read can occur in TextureStorage11 within the ANGLE graphics library, used for WebGL content. This results in a potentially exploitable crash. A use-after-free vulnerability can occur after deleting a selection element due to a weak reference to the select...

Spoofing attack through text injection into internal error pages — Mozilla

Security researcher musicDespiteEverything reported that some of the special about: URLs used by Firefox to display system information or error messages can incorporate text passed as parameters. These could be used in spoofing attacks...

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...

Memory corruption when modifying a file being read by FileReader — Mozilla

Security researcher Oriol reported memory corruption when local files are modified by either the user or another program at the same time being read using the FileReader API. This flaw requires that input be taken from a local file in order to be triggered and cannot be triggered by web content...

Displayed page address can be overridden — Mozilla

Security researcher Abdulrahman Alqabandi reported an issue where an attacker can load an arbitrary web page but the addressbar's displayed URL will be blank or filled with page defined content. This can be used to obfuscate which page is currently loaded and allows for an attacker to spoof an...

Cross-origin information leak through web workers error events — Mozilla

Security researcher Masato Kinugawa reported a cross-origin information leak through the error events in web workers. This violates same-origin policy and the leaked information could potentially be used by a malicious party to gather authentication tokens and other data from third-party websites...

Arbitrary file manipulation by local user through Mozilla updater — Mozilla

Security researcher Holger Fuhrmannek reported that when the Mozilla updater is run, the updater can be manipulated to load the updated files from a working directory under user control in concert with junctions. When the updates are run by the Mozilla Maintenance Service on Windows, these...

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...

Heap overflow in gdk-pixbuf when scaling bitmap images — Mozilla

Security researcher Gustavo Grieco reported a heap overflow in gdk-pixbuf affecting Linux systems using Gnome. This issue is triggered by the scaling of a malformed bitmap format image and results in a potentially exploitable crash...

Memory corruption crashes in Off Main Thread Compositing — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover two memory corruption crashes during 2D graphics rendering due to problems in Off Main Thread Compositing. These crashes are potentially exploitable...

Reading of local files through manipulation of form autocomplete — Mozilla

Security researcher Armin Ebert reported that a user readable file in a known local path could be uploaded to a malicious site. This was done by manipulating the autocomplete feature in a form and user interaction with it. While the local file is not visibly uploaded through the form, its content...

Miscellaneous memory safety hazards (rv:34.0 / rv:31.3) — 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...

Miscellaneous memory safety hazards (rv:33.0 / rv:31.2) — 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 during CSS manipulation — Mozilla

Using the Address Sanitizer tool, security researcher Atte Kettunen from OUSPG discovered a buffer overflow when making capitalization style changes during CSS parsing. This can cause a crash that is potentially exploitable...

Local file access via Open Link in new tab — Mozilla

Security researcher Alex Inführ reported that on Firefox for Android it is possible to open links to local files from web content by selecting "Open Link in New Tab" from the context menu using the file: protocol. The web content would have to know the precise location of a malicious local file i...

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...