[MFSA-2020-41] Security Vulnerabilities fixed in Thunderbird 78.2

Severity High

Affected Packages 1

Fixed Packages 1

CVEs 3

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-2020-15663: Downgrade attack on the Mozilla Maintenance Service could have resulted in escalation of privilege (high)
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 to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges.
Note: This issue only affected Windows operating systems. Other operating systems are unaffected.
CVE-2020-15664: Attacker-induced prompt for extension installation (high)
By holding a reference to the <code>eval()</code> function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user confusion, this could result in an unintended or malicious extension being installed.
CVE-2020-15670: Memory safety bugs fixed in Thunderbird 78.2 (high)
Mozilla developers Jason Kratzer, Christian Holler, Byron Campen, Tyson Smith reported memory safety bugs present in Thunderbird 78.1. 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	< 78.2

Package	Fixed Version
pkg:mozilla/Thunderbird	= 78.2

ID

MFSA-2020-41

Severity

high

URL

https://www.mozilla.org/en-US/security/advisories/mfsa2020-41

Published

2020-08-25T00:00:00
(4 years ago)

Modified

2020-08-25T00:00:00
(4 years ago)

Other Advisories

Source	# ID	Name	URL
Bugzilla	1643199		https://bugzilla.mozilla.org/show_bug.cgi?id=1643199
Bugzilla	1658214		https://bugzilla.mozilla.org/show_bug.cgi?id=1658214
Bugzilla	1651001	Memory safety bugs fixed in Thunderbird 78.2	https://bugzilla.mozilla.org/show_bug.cgi?id=1651001
Bugzilla	1651449	Memory safety bugs fixed in Thunderbird 78.2	https://bugzilla.mozilla.org/show_bug.cgi?id=1651449
Bugzilla	1653626	Memory safety bugs fixed in Thunderbird 78.2	https://bugzilla.mozilla.org/show_bug.cgi?id=1653626
Bugzilla	1656957	Memory safety bugs fixed in Thunderbird 78.2	https://bugzilla.mozilla.org/show_bug.cgi?id=1656957

Type	Package URL	Namespace	Name / Product	Version	Distribution / Platform	Arch	Patch / Fix
Affected	pkg:mozilla/Thunderbird		Thunderbird	< 78.2
Fixed	pkg:mozilla/Thunderbird		Thunderbird	= 78.2

# 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