Arch Linux Security Advisory ASA-202002-9
=========================================

Severity: Critical
Date    : 2020-02-13
CVE-ID  : CVE-2020-6792 CVE-2020-6793 CVE-2020-6794 CVE-2020-6795
          CVE-2020-6798 CVE-2020-6800
Package : thunderbird
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1099

Summary
=======

The package thunderbird before version 68.5.0-1 is vulnerable to
multiple issues including arbitrary code execution, cross-site
scripting, denial of service and information disclosure.

Resolution
==========

Upgrade to 68.5.0-1.

# pacman -Syu "thunderbird>=68.5.0-1"

The problems have been fixed upstream in version 68.5.0.

Workaround
==========

None.

Description
===========

- CVE-2020-6792 (information disclosure)

An information disclosure issue has bee found in Thunderbird before
68.5. When deriving an Message ID identifier for an email message,
uninitialized memory was used in addition to the message contents.

- CVE-2020-6793 (information disclosure)

An out-of-bounds read has been found in Thunderbird before 68.5, when
processing an e-mail message with an ill-formed envelope.

- CVE-2020-6794 (information disclosure)

It has been found that setting a master password post-Thunderbird 52
does not delete unencrypted previously stored passwords before
Thunderbird 68.5. If a user saved passwords before Thunderbird 60 and
then later set a master password, an unencrypted copy of these
passwords is still accessible. This is because the older stored
password file was not deleted when the data was copied to a new format
starting in Thunderbird 60. The new master password is added only on
the new file. This could allow the exposure of stored password data
outside of user expectations.

- CVE-2020-6795 (denial of service)

A null-pointer dereference has been found in Thunderbird before 68.5,
when processing a message that contains multiple S/MIME signatures.

- CVE-2020-6798 (cross-site scripting)

An incorrect parsing of template could result in Javascript injection
in Firefox before 73.0 and Thunderbird before 68.5. If a <template> tag
was used in a <select%gt; tag, the parser could be confused and allow
JavaScript parsing and execution when it should not be allowed. A site
that relied on the browser behaving correctly could suffer a cross-site
scripting vulnerability as a result.
In general, this flaw cannot be exploited through email in the
Thunderbird product because scripting is disabled when reading mail,
but is potentially a risk in browser or browser-like contexts.

- CVE-2020-6800 (arbitrary code execution)

Several memory safety bugs have been found in Firefox before 73.0 and
Thunderbird before 68.5. Some of these bugs showed evidence of memory
corruption and Mozilla presumes that with enough effort some of these
could have been exploited to run arbitrary code.

Impact
======

A remote attacker can access sensitive information, bypass security
measures, crash the application or execute arbitrary code.

References
==========

https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/
https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/#CVE-2020-6792
https://bugzilla.mozilla.org/show_bug.cgi?id=1609607
https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/#CVE-2020-6793
https://bugzilla.mozilla.org/show_bug.cgi?id=1608539
https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/#CVE-2020-6794
https://bugzilla.mozilla.org/show_bug.cgi?id=1606619
https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/#CVE-2020-6795
https://bugzilla.mozilla.org/show_bug.cgi?id=1611105
https://www.mozilla.org/en-US/security/advisories/mfsa2020-05/#CVE-2020-6798
https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/#CVE-2020-6798
https://bugzilla.mozilla.org/show_bug.cgi?id=1602944
https://www.mozilla.org/en-US/security/advisories/mfsa2020-05/#CVE-2020-6800
https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/#CVE-2020-6800
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1595786%2C1596706%2C1598543%2C1604851%2C1608580%2C1608785%2C1605777
https://security.archlinux.org/CVE-2020-6792
https://security.archlinux.org/CVE-2020-6793
https://security.archlinux.org/CVE-2020-6794
https://security.archlinux.org/CVE-2020-6795
https://security.archlinux.org/CVE-2020-6798
https://security.archlinux.org/CVE-2020-6800