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Ubuntu Security Notice USN-4736-1

Ubuntu Security Notice USN-4736-1
Posted Feb 16, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4736-1 - Multiple security issues were discovered in Thunderbird. If a user were tricked into 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 responses received during the plaintext phase of the STARTTLS connection setup were subsequently evaluated during the encrypted session. A person in the middle could potentially exploit this to perform a response injection attack. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2020-15685, CVE-2021-23953, CVE-2021-23954, CVE-2021-23960
MD5 | f6196100b7e6c3859b8474631f16bf7e

Ubuntu Security Notice USN-4736-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4736-1
February 16, 2021

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

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

- Ubuntu 20.10

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 into 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. (CVE-2020-26976,
CVE-2021-23953, CVE-2021-23954, CVE-2021-23960, CVE-2021-23964)

It was discovered that responses received during the plaintext phase of
the STARTTLS connection setup were subsequently evaluated during the
encrypted session. A person in the middle could potentially exploit this
to perform a response injection attack. (CVE-2020-15685)

Update instructions:

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

Ubuntu 20.10:
thunderbird 1:78.7.1+build1-0ubuntu0.20.10.4

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

References:
https://usn.ubuntu.com/4736-1
CVE-2020-15685, CVE-2020-26976, CVE-2021-23953, CVE-2021-23954,
CVE-2021-23960, CVE-2021-23964

Package Information:

https://launchpad.net/ubuntu/+source/thunderbird/1:78.7.1+build1-0ubuntu0.20.10.4
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