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Ubuntu Security Notice USN-4421-1

Ubuntu Security Notice USN-4421-1
Posted Jul 8, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4421-1 - Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, or execute arbitrary code. It was discovered that Thunderbird would continue an unencrypted connection when configured to use STARTTLS for IMAP if the server responded with PREAUTH. A remote attacker could potentially exploit this to perform a person-in-the-middle attack in order to obtain sensitive information. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary, imap
systems | linux, ubuntu
advisories | CVE-2020-12398, CVE-2020-12399, CVE-2020-12406, CVE-2020-12410, CVE-2020-12419, CVE-2020-12420, CVE-2020-12421
SHA-256 | e29ba156301d1adef5ee70accc941815f87182af2911cd015ba0d303ce8a38ff

Ubuntu Security Notice USN-4421-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4421-1
July 08, 2020

thunderbird vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Thunderbird.

Software Description:
- thunderbird: Mozilla Open Source mail and newsgroup client

Details:

Multiple security issues were discovered in Thunderbird. If a user were
tricked in to opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, or execute arbtirary code. (CVE-2020-12405,
CVE-2020-12406, CVE-2020-12410, CVE-2020-12417, CVE-2020-12418,
CVE-2020-12419, CVE-2020-12420)

It was discovered that Thunderbird would continue an unencrypted
connection when configured to use STARTTLS for IMAP if the server
responded with PREAUTH. A remote attacker could potentially exploit
this to perform a person-in-the-middle attack in order to obtain
sensitive information. (CVE-2020-12398)

It was discovered that NSS showed timing differences when performing DSA
signatures. An attacker could potentially exploit this to obtain private
keys using a timing attack. (CVE-2020-12399)

It was discovered that when performing add-on updates, certificate chains
not terminating with built-in roots were silently rejected. This could
result in add-ons becoming outdated. (CVE-2020-12421)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
thunderbird 1:68.10.0+build1-0ubuntu0.20.04.1

Ubuntu 19.10:
thunderbird 1:68.10.0+build1-0ubuntu0.19.10.1

Ubuntu 18.04 LTS:
thunderbird 1:68.10.0+build1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
thunderbird 1:68.10.0+build1-0ubuntu0.16.04.1

After a standard system update you need to restart Thunderbird to make
all the necessary changes.

References:
https://usn.ubuntu.com/4421-1
CVE-2020-12398, CVE-2020-12399, CVE-2020-12405, CVE-2020-12406,
CVE-2020-12410, CVE-2020-12417, CVE-2020-12418, CVE-2020-12419,
CVE-2020-12420, CVE-2020-12421

Package Information:

https://launchpad.net/ubuntu/+source/thunderbird/1:68.10.0+build1-0ubuntu0.20.04.1

https://launchpad.net/ubuntu/+source/thunderbird/1:68.10.0+build1-0ubuntu0.19.10.1

https://launchpad.net/ubuntu/+source/thunderbird/1:68.10.0+build1-0ubuntu0.18.04.1

https://launchpad.net/ubuntu/+source/thunderbird/1:68.10.0+build1-0ubuntu0.16.04.1
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