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Ubuntu Security Notice USN-4366-1

Ubuntu Security Notice USN-4366-1
Posted May 19, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4366-1 - It was discovered that Exim incorrectly handled certain inputs. An remote attacker could possibly use this issue to access sensitive information or authentication bypass.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2020-12783
SHA-256 | fa20c59a48dd7ec2dacda4384b8f02fff205e32ea312b2bb14314a56a075844c

Ubuntu Security Notice USN-4366-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4366-1
May 19, 2020

exim4 vulnerability
=========================================================================
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
- Ubuntu 14.04 ESM

Summary:

Exim could be made to access sensitive information or bypass
authentication if it received a specially crafted input.

Software Description:
- exim4: Exim is a mail transport agent

Details:

It was discovered that Exim incorrectly handled certain inputs.
An remote attacker could possibly use this issue to access sensitive
information or authentication bypass.

Update instructions:

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

Ubuntu 20.04 LTS:
exim4-base 4.93-13ubuntu1.1
exim4-daemon-heavy 4.93-13ubuntu1.1
exim4-daemon-light 4.93-13ubuntu1.1

Ubuntu 19.10:
exim4-base 4.92.1-1ubuntu3.1
exim4-daemon-heavy 4.92.1-1ubuntu3.1
exim4-daemon-light 4.92.1-1ubuntu3.1

Ubuntu 18.04 LTS:
exim4-base 4.90.1-1ubuntu1.5
exim4-daemon-heavy 4.90.1-1ubuntu1.5
exim4-daemon-light 4.90.1-1ubuntu1.5

Ubuntu 16.04 LTS:
exim4-base 4.86.2-2ubuntu2.6
exim4-daemon-heavy 4.86.2-2ubuntu2.6
exim4-daemon-light 4.86.2-2ubuntu2.6

Ubuntu 14.04 ESM:
exim4-base 4.82-3ubuntu2.4+esm2
exim4-daemon-heavy 4.82-3ubuntu2.4+esm2
exim4-daemon-light 4.82-3ubuntu2.4+esm2

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

References:
https://usn.ubuntu.com/4366-1
CVE-2020-12783

Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.93-13ubuntu1.1
https://launchpad.net/ubuntu/+source/exim4/4.92.1-1ubuntu3.1
https://launchpad.net/ubuntu/+source/exim4/4.90.1-1ubuntu1.5
https://launchpad.net/ubuntu/+source/exim4/4.86.2-2ubuntu2.6
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