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Ubuntu 19.04, 18.04 LTS: USN-4124-1 Critical Exim Execution Risk

ubuntu
Calendar Grey September 6, 2019
Dist Ubuntu Esm H88
The new Ubuntu Security Alert USN-4124-1 highlights a critical flaw in Exim that could enable remote command execution through specially designed packets.
Exim could be made to run programs as an administrator if it received specially crafted network traffic.

Summary

Exim could be made to run programs as an administrator if it received

specially crafted network traffic.

Software Description:

- exim4: Exim is a mail transport agent

Details:

It was discovered that Exim incorrectly handled certain decoding

operations. A remote attacker could possibly use this issue to execute

arbitrary commands.

Topics%20covered

Topics Covered

security advisory exim remote execution ubuntu administrative access

Update Instructions

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

Ubuntu 19.04:
  exim4-daemon-heavy              4.92-4ubuntu1.3
  exim4-daemon-light              4.92-4ubuntu1.3

Ubuntu 18.04 LTS:
  exim4-daemon-heavy              4.90.1-1ubuntu1.4
  exim4-daemon-light              4.90.1-1ubuntu1.4

Ubuntu 16.04 LTS:
  exim4-daemon-heavy              4.86.2-2ubuntu2.5
  exim4-daemon-light              4.86.2-2ubuntu2.5

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4124-1

CVE-2019-15846, https://bugs.launchpad.net/ubuntu/+source/exim4/+bug/1843041

Severity
critical
Lowest
Low
Medium
High
Critical

September 06, 2019

Topics%20covered

Topics Covered

security advisory exim remote execution ubuntu administrative access

Package Information

https://launchpad.net/ubuntu/+source/exim4/4.92-4ubuntu1.3
https://launchpad.net/ubuntu/+source/exim4/4.90.1-1ubuntu1.4
https://launchpad.net/ubuntu/+source/exim4/4.86.2-2ubuntu2.5

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