An Exim security update has been released for Ubuntu Linux 21.04, 20.10, 20.04 LTS, and 18.04 LTS.
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Ubuntu Security Notice USN-4934-1
May 04, 2021
exim4 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in Exim.
Software Description:
- exim4: Exim is a mail transport agent
Details:
It was discovered that Exim contained multiple security issues. An attacker
could use these issues to cause a denial of service, execute arbitrary
code remotely, obtain sensitive information, or escalate local privileges.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
exim4-base 4.94-15ubuntu1.2
exim4-daemon-heavy 4.94-15ubuntu1.2
exim4-daemon-light 4.94-15ubuntu1.2
Ubuntu 20.10:
exim4-base 4.94-7ubuntu1.2
exim4-daemon-heavy 4.94-7ubuntu1.2
exim4-daemon-light 4.94-7ubuntu1.2
Ubuntu 20.04 LTS:
exim4-base 4.93-13ubuntu1.5
exim4-daemon-heavy 4.93-13ubuntu1.5
exim4-daemon-light 4.93-13ubuntu1.5
Ubuntu 18.04 LTS:
exim4-base 4.90.1-1ubuntu1.8
exim4-daemon-heavy 4.90.1-1ubuntu1.8
exim4-daemon-light 4.90.1-1ubuntu1.8
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4934-1
CVE-2020-28007, CVE-2020-28008, CVE-2020-28009, CVE-2020-28010,
CVE-2020-28011, CVE-2020-28012, CVE-2020-28013, CVE-2020-28014,
CVE-2020-28015, CVE-2020-28016, CVE-2020-28017, CVE-2020-28018,
CVE-2020-28019, CVE-2020-28020, CVE-2020-28021, CVE-2020-28022,
CVE-2020-28023, CVE-2020-28024, CVE-2020-28025, CVE-2020-28026,
CVE-2021-27216
Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.94-15ubuntu1.2
https://launchpad.net/ubuntu/+source/exim4/4.94-7ubuntu1.2
https://launchpad.net/ubuntu/+source/exim4/4.93-13ubuntu1.5
https://launchpad.net/ubuntu/+source/exim4/4.90.1-1ubuntu1.8
