Local downloaded file tampering — Mozilla

Security researcher Jeremy Brown reported that the file naming scheme used for downloading a file which already exists in the downloads folder is predictable. If an attacker had local access to a victim's computer and knew the name of a file the victim intended to open through the Download Manage...

Arbitrary code execution using event listeners attached to an element whose owner document is null — Mozilla

Mozilla security researcher mozbugra4 reported that the owner document of an element can become null after garbage collection. In such cases, event listeners may be executed within the wrong JavaScript context. An attacker could potentially use this vulnerability to have a malicious event handler...

Crash in nsTextFrame::ClearTextRun() — Mozilla

One of the security fixes in Firefox 3.0.9 introduced a regression that caused some users to experience frequent crashes. Users of the HTML Validator add-on were particularly affected, but other users also experienced this crash in some situations. In analyzing this crash we discovered that it wa...

Long document title causes startup denial of service — Mozilla

Web pages with extremely long titles--the public demonstration had a title 2.5 million characters long--cause subsequent launches of the browser to appear to "hang" for up to a few minutes, or even crash if the computer has insufficient memory...

Security Vulnerabilities fixed in Firefox ESR 115.26 — Mozilla

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. On arm64, a WASM brtable instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrec...

Security Vulnerabilities fixed in Firefox ESR 128.1 — Mozilla

Select options could obscure the fullscreen notification dialog. This could be used by a malicious site to perform a spoofing attack. Insufficient checks when processing graphics shared memory could have led to memory corruption. This could be leveraged by an attacker to perform a sandbox escape....

Security Vulnerabilities fixed in Firefox ESR 91.13 — Mozilla

An attacker could have abused XSLT error handling to associate attacker-controlled content with another origin which was displayed in the address bar. This could have been used to fool the user into submitting data intended for the spoofed origin. A cross-origin iframe referencing an XSLT documen...

Security Vulnerabilities fixed in Thunderbird 68.10.0 — Mozilla

Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially exploitable crash.Note: this issue only affects Firefox on ARM64 platforms. Manipulating individual parts of a URL object could have caused an...

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...

Location bar spoofing via data URLs with malformed/invalid mediatypes — Mozilla

Security researcher Firas Salem reported that decoding url-encoded values in data: urls for display leads to potential spoofing in the Location bar by using non-ASCII and emoji characters in a data: url's mediatype. This issue could result in the wrong URL being displayed as a location, which can...

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...

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...

Use-after-free during processing of DER encoded keys in NSS — Mozilla

Mozilla developer Tim Taubert used the Address Sanitizer tool and software fuzzing to discover a use-after-free vulnerability while processing DER encoded keys in the Network Security Services NSS libraries. The vulnerability overwrites the freed memory with zeroes. This issue has been addressed ...

Memory leak in libstagefright when deleting an array during MP4 processing — Mozilla

Security researchers Jose Martinez and Romina Santillan reported a memory leak in the libstagefright library when array destruction occurs during MPEG4 video file processing...

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...

Buffer overflows found through code inspection — Mozilla

Security researcher Ronald Crane reported three buffer overflows affecting released code that were found through code inspection. They do not all have clear mechanisms to be exploited through web content but are vulnerable if a mechanism can be found to trigger them...

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...

Use-after-free during text processing with vertical text enabled — Mozilla

Security researcher Scott Bell used the Address Sanitizer tool to discover a use-after-free error during the processing of text when vertical text is enabled. This leads to a potentially exploitable crash...

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 ...

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...

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...

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...

Miscellaneous memory safety hazards (rv:29.0 / rv:24.5) — 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...

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...

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...

UI selection timeout missing on download prompts — Mozilla

Security researcher Jordi Chancel reported that the dialog for saving downloaded files did not implement a security timeout before button selections were processed. This could be used in concert with spoofing to convince users to select a different option than intended, causing downloaded files t...

Potential overflow in JavaScript binary search algorithms — Mozilla

Compiler Engineer Dan Gohman of Google reported that binary search algorithms in the SpiderMonkey JavaScript engine were prone to overflow in several places, leading to potential out-of-bounds array access. While none of these are known to be directly exploitable, they are unsafe in theory and ha...

Access violation with XSLT and uninitialized data — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team used the Address Sanitizer tool to discover an access violation due to uninitialized data during Extensible Stylesheet Language Transformation XSLT processing. This leads to a potentially exploitable crash...

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...

Use-after-free in HTML Editor — Mozilla

VUPEN Security, via TippingPoint's Zero Day Initiative, reported a use-after-free within the HTML editor when content script is run by the document.execCommand function while internal editor operations are occurring. This could allow for arbitrary code execution...

Wrapped WebIDL objects can be wrapped again — Mozilla

Mozilla developer Boris Zbarsky reported that in some circumstances a wrapped WebIDL object can be wrapped multiple times, overwriting the existing wrapped state. This could lead to an exploitable condition in rare cases...

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...

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...

Graphite 2 memory corruption — Mozilla

Using the Address Sanitizer tool, Mozilla security researcher Christoph Diehl discovered two memory corruption issues involving the Graphite 2 library used in Mozilla products. Both of these issues can cause a potentially exploitable crash. These problems were fixed in the Graphite 2 library, whi...

Insecure use of __android_log_print — Mozilla

Mozilla developer Blake Kaplan reported that androidlogprint is called insecurely in places. If a malicious web page used a dump statement with a specially crafted string, it can trigger a potentially exploitable crash...

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...

Key detection without JavaScript via SVG animation — Mozilla

Security researcher Mario Heiderich reported it was possible to use SVG animation accessKey events to detect key strokes even when JavaScript was disabled. Since web pages can normally detect key events through script and most users have scripting enabled this does not present a risk for most...

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...

nsTreeSelection dangling pointer remote code execution vulnerability — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative an integer overflow vulnerability in the implementation of the XUL element's selection attribute. When the size of a new selection is sufficiently large the integer used in calculating the length of the selection can...

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:1.9.1.3/ 1.9.0.14) — 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:1.8.0.2) — Mozilla

As part of the Firefox 1.5.0.2 release we fixed several crash bugs to improve the stability of the product, with a particular focus on finding crashes caused by DHTML. Some of these crashes showed evidence of memory corruption that we presume could be exploited to run arbitrary code with enough...

Security Vulnerabilities fixed in Firefox ESR 102.4 — Mozilla

A same-origin policy violation could have allowed the theft of cross-origin URL entries, leaking the result of a redirect, via performance.getEntries. Certain types of allocations were missing annotations that, if the Garbage Collector was in a specific state, could have lead to memory corruption...

Crash in incremental garbage collection in JavaScript — Mozilla

Security researcher Jukka Jylänki reported a use-after-free in JavaScript caused by how objects and pointers are handled during incremental garbage collection in some circumstances working with object groups. When triggered, this causes a potential exploitable crash but is mitigated by the...

Cairo rendering crash due to memory allocation issue with FFmpeg 0.10 — Mozilla

Security researcher Bert Massop reported a crash in the Cairo graphics layer on Linux systems using the LibAV library included in version 0.10 of the FFmpeg library. This was due to an error when allocating the LibAV header when decoding some videos...

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...

CSP not applied to pages sent with multipart/x-mixed-replace — Mozilla

Security researcher Muneaki Nishimura nishimunea of Recruit Technologies Co., Ltd. reported that Content Security Policy CSP is not applied correctly to web content sent with the multipart/x-mixed-replace MIME type. This allows for script to run in instances where CSP should block it, leading to ...

Firefox allows for control characters to be set in cookie names — Mozilla

Security researcher musicDespiteEverything previously reported an issue where illegal control characters were stored in as cookie values in violation of RFC6265. While fixing this issue, Mozilla developer Nicholas Hurley realized that the same issue applied to the names of cookies. These characte...

Unsafe memory manipulation found through code inspection — Mozilla

Security researcher Ronald Crane reported three vulnerabilities affecting released code that were found through code inspection. These include a high rated memory safety issue in the ANGLE graphics library, a moderate rated potential wild pointer flaw when handling zip files, and a critical rated...

Miscellaneous memory safety hazards (rv:36.0 / rv:31.5) — 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...