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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4081 MFSA 2020-52 Security Vulnerabilities fixed in Thunderbird 78.5 18 November 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Thunderbird Publisher: Mozilla Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Cross-site Scripting -- Remote with User Interaction Denial of Service -- Remote with User Interaction Provide Misleading Information -- Remote with User Interaction Access Confidential Data -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2020-26968 CVE-2020-26966 CVE-2020-26965 CVE-2020-26961 CVE-2020-26960 CVE-2020-26959 CVE-2020-26958 CVE-2020-26956 CVE-2020-26953 CVE-2020-26951 CVE-2020-16012 CVE-2020-15999 Reference: ESB-2020.4080 ESB-2020.3800.2 ESB-2020.3611 Original Bulletin: https://www.mozilla.org/en-US/security/advisories/mfsa2020-52/ - --------------------------BEGIN INCLUDED TEXT-------------------- Mozilla Foundation Security Advisory 2020-52 Security Vulnerabilities fixed in Thunderbird 78.5 Announced November 17, 2020 Impact high Products Thunderbird Fixed in Thunderbird 78.5 In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts. # CVE-2020-26951: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code Reporter Irvan Kurniawan (@sourc7) Impact high Description A parsing and event loading mismatch in Thunderbird's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. References o Bug 1667113 # CVE-2020-16012: Variable time processing of cross-origin images during drawImage calls Reporter Aleksejs Popovs Impact moderate Description When drawing a transparent image on top of an unknown cross-origin image, the Skia library drawImage function took a variable amount of time depending on the content of the underlying image. This resulted in potential cross-origin information exposure of image content through timing side-channel attacks. References o Bug 1642028 # CVE-2020-26953: Fullscreen could be enabled without displaying the security UI Reporter Abdulrahman Alqabandi of Microsoft Browser Vulnerability Research Impact moderate Description It was possible to cause the browser to enter fullscreen mode without displaying the security UI; thus making it possible to attempt a phishing attack or otherwise confuse the user. References o Bug 1656741 # CVE-2020-26956: XSS through paste (manual and clipboard API) Reporter Irvan Kurniawan (@sourc7) Impact moderate Description In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. References o Bug 1666300 # CVE-2020-26958: Requests intercepted through ServiceWorkers lacked MIME type restrictions Reporter Moti Harmats Impact moderate Description Thunderbird did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker. This could lead to a cross-site script inclusion vulnerability, or a Content Security Policy bypass. References o Bug 1669355 # CVE-2020-26959: Use-after-free in WebRequestService Reporter Bharadwaj Machiraju Impact moderate Description During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. References o Bug 1669466 # CVE-2020-26960: Potential use-after-free in uses of nsTArray Reporter Zijie Zhao Impact moderate Description If the Compact() method was called on an nsTArray, the array could have been reallocated without updating other pointers, leading to a potential use-after-free and exploitable crash. References o Bug 1670358 # CVE-2020-15999: Heap buffer overflow in freetype Reporter Sergei Glazunov of Google Project Zero Impact moderate Description In Freetype, if PNG images were embedded into fonts, the Load_SBit_Png function contained an integer overflow that led to a heap buffer overflow, memory corruption, and an exploitable crash. Note: While Project Zero did discover instances of this vulnerability being exploited in the wild against Chrome, in Thunderbird this vulnerability is only triggerable if a rarely-used, hidden preference is toggled, and only affected Linux and Android operating systems. Other operating systems are unaffected; and Linux and Android are unaffected in the default configuration. References o Bug 1672223 # CVE-2020-26961: DoH did not filter IPv4 mapped IP Addresses Reporter Gabriel Corona Impact moderate Description When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack. References o Bug 1672528 # CVE-2020-26965: Software keyboards may have remembered typed passwords Reporter Makoto Kato Impact low Description Some websites have a feature "Show Password" where clicking a button will change a password field into a textbook field, revealing the typed password. If, when using a software keyboard that remembers user input, a user typed their password and used that feature, the type of the password field was changed, resulting in a keyboard layout change and the possibility for the software keyboard to remember the typed password. References o Bug 1661617 # CVE-2020-26966: Single-word search queries were also broadcast to local network Reporter tiebuchen Impact low Description Searching for a single word from the address bar caused an mDNS request to be sent on the local network searching for a hostname consisting of that string; resulting in an information leak. Note: This issue only affected Windows operating systems. Other operating systems are unaffected. References o Bug 1663571 # CVE-2020-26968: Memory safety bugs fixed in Thunderbird 78.5 Reporter Mozilla developers and community Impact high Description Mozilla developers Steve Fink, Jason Kratzer, Randell Jesup, Christian Holler, and Byron Campen reported memory safety bugs present in Thunderbird 78.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. References o Memory safety bugs fixed in Thunderbird 78.5 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBX7Rr2+NLKJtyKPYoAQhhRg/9GgDw4OYfVZifGnUjzm32QA1Q6aFx3NJq wyAWY48OeTXbtQQF0SwmQdJ5UQS9MQCMfyvJWhXLRTzWZCa53yPBcBl+Rse/U+yQ 3VXjNKyqxQzzBDQsspDRFgQcUALE0J+Qby7rDMDMG3WbSGIi3EtvvRn7fiOV95OJ jcN5B7FVv3lYOyMRrutOksadJcqB6WMliT3AKgYTWrQeX+OYjeWgJoUOmCwwOTBR vuPUoFKwYBdoJ+hEZWVZc9F6jh9wyHauQxu1p+R1Iwt4olsmQ3y7lHRQUzhOqXj+ 6Neh0T0Hcmax9YXmVGArfUzTp+6sjkcv1VpKpSpnepdGd3/hhmGqnUSnSR6s+cYU QptsWICFOVITrqwx7NI4samT0/Pp0PNvgK7AL5gVfFfb+R1WTCZilOy6FRsqO+oz mtMaWDp29oH1KOa/NKgFtNuEbJQ95GOx3rPoa7S8ZC0FyGG5J6lsAHoIs/wTe/pJ Ydcf3w5dsTdL3ZPpWIsC697YkO8A5KmDBerSRRkXOZ3//uOE/hXsi1C2zeZMWn8o +Taa6sK8U9rEhvicdxjP9Tl1uCHQcPq2hbf4nC9lhY+Ccrr5tfJm/1dUb+CaxY+g MIScoCsIjhd0nngNuojOoQhnUO72OZW/OSmEWlVq8QVvpqo+mI3/Gqh/w+CrfOne WkjqCaYwTNQ= =4od0 -----END PGP SIGNATURE-----