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Ubuntu: 2021:4934-1 Critical: Exim Denial Of Service Threat

ubuntu
Calendar Grey May 4, 2021
Dist Ubuntu Esm H88
Multiple vulnerabilities have been addressed in OpenSSH, impacting several Debian distributions, enhancing secure shell access.
Several security issues were fixed in Exim.

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.

Topics%20covered

Topics Covered

security advisory denial of service remote code execution exim Ubuntu update instructions software issue ubuntu Exim

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

Severity
critical
Lowest
Low
Medium
High
Critical

May 04, 2021

Topics%20covered

Topics Covered

security advisory denial of service remote code execution exim Ubuntu update instructions software issue ubuntu Exim

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

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