[MFSA-2020-52] Security Vulnerabilities fixed in Thunderbird 78.5

Severity High

Affected Packages 1

Fixed Packages 1

CVEs 12

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-2020-15999: Heap buffer overflow in freetype (moderate)
In Freetype, if PNG images were embedded into fonts, the <code>Load_SBit_Png</code> 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.
CVE-2020-16012: Variable time processing of cross-origin images during drawImage calls (moderate)
When drawing a transparent image on top of an unknown cross-origin image, the Skia library <code>drawImage</code> 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.
CVE-2020-26951: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code (high)
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.
CVE-2020-26953: Fullscreen could be enabled without displaying the security UI (moderate)
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.
CVE-2020-26956: XSS through paste (manual and clipboard API) (moderate)
In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS.
CVE-2020-26958: Requests intercepted through ServiceWorkers lacked MIME type restrictions (moderate)
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.
CVE-2020-26959: Use-after-free in WebRequestService (moderate)
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.
CVE-2020-26960: Potential use-after-free in uses of nsTArray (moderate)
If the <code>Compact()</code> 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.
CVE-2020-26961: DoH did not filter IPv4 mapped IP Addresses (moderate)
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.
CVE-2020-26965: Software keyboards may have remembered typed passwords (low)
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.
CVE-2020-26966: Single-word search queries were also broadcast to local network (low)
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.
CVE-2020-26968: Memory safety bugs fixed in Thunderbird 78.5 (high)
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.

Package	Affected Version
pkg:mozilla/Thunderbird	< 78.5

Package	Fixed Version
pkg:mozilla/Thunderbird	= 78.5

ID

MFSA-2020-52

Severity

high

URL

https://www.mozilla.org/en-US/security/advisories/mfsa2020-52

Published

2020-11-17T00:00:00
(3 years ago)

Modified

2020-11-17T00:00:00
(3 years ago)

Other Advisories

Source	# ID	Name	URL
Bugzilla	1672223		https://bugzilla.mozilla.org/show_bug.cgi?id=1672223
Bugzilla	1642028		https://bugzilla.mozilla.org/show_bug.cgi?id=1642028
Bugzilla	1667113		https://bugzilla.mozilla.org/show_bug.cgi?id=1667113
Bugzilla	1656741		https://bugzilla.mozilla.org/show_bug.cgi?id=1656741
Bugzilla	1666300		https://bugzilla.mozilla.org/show_bug.cgi?id=1666300
Bugzilla	1669355		https://bugzilla.mozilla.org/show_bug.cgi?id=1669355
Bugzilla	1669466		https://bugzilla.mozilla.org/show_bug.cgi?id=1669466
Bugzilla	1670358		https://bugzilla.mozilla.org/show_bug.cgi?id=1670358
Bugzilla	1672528		https://bugzilla.mozilla.org/show_bug.cgi?id=1672528
Bugzilla	1661617		https://bugzilla.mozilla.org/show_bug.cgi?id=1661617
Bugzilla	1663571		https://bugzilla.mozilla.org/show_bug.cgi?id=1663571
Bugzilla	1551615	Memory safety bugs fixed in Thunderbird 78.5	https://bugzilla.mozilla.org/show_bug.cgi?id=1551615
Bugzilla	1607762	Memory safety bugs fixed in Thunderbird 78.5	https://bugzilla.mozilla.org/show_bug.cgi?id=1607762
Bugzilla	1656697	Memory safety bugs fixed in Thunderbird 78.5	https://bugzilla.mozilla.org/show_bug.cgi?id=1656697
Bugzilla	1657739	Memory safety bugs fixed in Thunderbird 78.5	https://bugzilla.mozilla.org/show_bug.cgi?id=1657739
Bugzilla	1660236	Memory safety bugs fixed in Thunderbird 78.5	https://bugzilla.mozilla.org/show_bug.cgi?id=1660236
Bugzilla	1667912	Memory safety bugs fixed in Thunderbird 78.5	https://bugzilla.mozilla.org/show_bug.cgi?id=1667912
Bugzilla	1671479	Memory safety bugs fixed in Thunderbird 78.5	https://bugzilla.mozilla.org/show_bug.cgi?id=1671479
Bugzilla	1671923	Memory safety bugs fixed in Thunderbird 78.5	https://bugzilla.mozilla.org/show_bug.cgi?id=1671923

Type	Package URL	Namespace	Name / Product	Version	Distribution / Platform	Arch	Patch / Fix
Affected	pkg:mozilla/Thunderbird		Thunderbird	< 78.5
Fixed	pkg:mozilla/Thunderbird		Thunderbird	= 78.5

# CVE	Description	CVSS	EPSS	EPSS Trend (30 days)	Affected Products	Weaknesses	Security Advisories	Exploits	PoC	Pubblication Date	Modification Date
# CVE	Description	CVSS	EPSS	EPSS Trend (30 days)	Affected Products	Weaknesses	Security Advisories	PoC	Pubblication Date	Modification Date