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AUSCERT External Security Bulletin Redistribution
ESB-2020.1776
USN-4366-1: Exim vulnerability
20 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: exim4
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12783
Reference: ESB-2020.1755.2
Original Bulletin:
https://usn.ubuntu.com/4366-1/
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USN-4366-1: Exim vulnerability
19 May 2020
exim4 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 20.04 LTS
o Ubuntu 19.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o 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
o 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
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-12783
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