Security vulnerabilities fixed in Thunderbird 52.2 — Mozilla

A use-after-free vulnerability with the frameloader during tree reconstruction while regenerating CSS layout when attempting to use a node in the tree that no longer exists. This results in a potentially exploitable crash.
A use-after-free vulnerability when using an incorrect URL during the reloading of a docshell. This results in a potentially exploitable crash.
A use-after-free vulnerability during video control operations when a element holds a reference to an older window if that window has been replaced in the DOM. This results in a potentially exploitable crash.
A use-after-free vulnerability with content viewer listeners that results in a potentially exploitable crash.
The Firefox installer on Windows can be made to load malicious DLL files stored in the same directory as the installer when it is run. This allows privileged execution if the installer is run with elevated privileges. Note: This attack only affects Windows operating systems. Other operating systems are unaffected.
A use-after-free vulnerability during specific user interactions with the input method editor (IME) in some languages due to how events are handled. This results in a potentially exploitable crash but would require specific user interaction to trigger.
An out-of-bounds read in WebGL with a maliciously crafted ImageInfo object during WebGL operations.
A use-after-free and use-after-scope vulnerability when logging errors from headers for XML HTTP Requests (XHR). This could result in a potentially exploitable crash.
A use-after-free vulnerability in IndexedDB when one of its objects is destroyed in memory while a method on it is still being executed. This results in a potentially exploitable crash.
A number of security vulnerabilities in the Graphite 2 library including out-of-bounds reads, buffer overflow reads and writes, and the use of uninitialized memory. These issues were addressed in Graphite 2 version 1.3.10.
An out-of-bounds read vulnerability with the Opus encoder when the number of channels in an audio stream changes while the encoder is in use.
Default fonts on OS X display some Tibetan characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected.
Characters from the “Canadian Syllabics” unicode block can be mixed with characters from other unicode blocks in the addressbar instead of being rendered as their raw “punycode” form, allowing for domain name spoofing attacks through character confusion. The current Unicode standard allows characters from “Aspirational Use Scripts” such as Canadian Syllabics to be mixed with Latin characters in the “moderately restrictive” IDN profile. We have changed Firefox behavior to match the upcoming Unicode version 10.0 which removes this category and treats them as “Limited Use Scripts.”
The “Mark of the Web” was not correctly saved on Windows when files with very long names were downloaded from the Internet. Without the Mark of the Web data, the security warning that Windows displays before running executables downloaded from the Internet is not shown. Note: This attack only affects Windows operating systems. Other operating systems are unaffected.
Mozilla developers and community members Tyson Smith, Mats Palmgren, Philipp, Masayuki Nakano, Christian Holler, Andrew McCreight, Gary Kwong, André Bargull, Carsten Book, Jesse Schwartzentruber, Julian Hector, Marcia Knous, Ronald Crane, and Nils Ohlmeier reported memory safety bugs present in Firefox 53, Firefox ESR 52.1, and Thunderbird 52.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.