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AUSCERT External Security Bulletin Redistribution
ESB-2020.2790.2
USN-4456-1 and -2: Dovecot vulnerabilities
18 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Dovecot
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12674 CVE-2020-12673 CVE-2020-12100
Original Bulletin:
https://usn.ubuntu.com/4456-1/
https://usn.ubuntu.com/4456-2/
Comment: This bulletin contains two (2) Ubuntu security advisories.
This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running Dovecot check for an updated version of the software for
their operating system.
Revision History: August 18 2020: Added USN-4456-2 for Ubuntu 14.04 ESM
August 13 2020: Initial Release
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USN-4456-1: Dovecot vulnerabilities
12 August 2020
Several security issues were fixed in Dovecot.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o dovecot - IMAP and POP3 email server
Details
It was discovered that Dovecot incorrectly handled deeply nested MIME
parts. A remote attacker could possibly use this issue to cause Dovecot to
consume resources, resulting in a denial of service. (CVE-2020-12100)
It was discovered that Dovecot incorrectly handled memory when using NTLM.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2020-12673)
It was discovered that the Dovecot RPA mechanism incorrectly handled
zero-length messages. A remote attacker could possibly use this issue to
cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12674)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o dovecot-core - 1:2.3.7.2-1ubuntu3.2
Ubuntu 18.04
o dovecot-core - 1:2.2.33.2-1ubuntu4.6
Ubuntu 16.04
o dovecot-core - 1:2.2.22-1ubuntu2.13
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-12100
o CVE-2020-12674
o CVE-2020-12673
- --------------------------------------------------------------------------------
USN-4456-2: Dovecot vulnerabilities
17 August 2020
Several security issues were fixed in Dovecot.
Releases
o Ubuntu 14.04 ESM
Packages
o dovecot - IMAP and POP3 email server
Details
USN-4456-1 fixed several vulnerabilities in Dovecot. This update provides
the corresponding update for Ubuntu 14.04 ESM.
Original advisory details:
It was discovered that Dovecot incorrectly handled deeply nested MIME
parts. A remote attacker could possibly use this issue to cause Dovecot to
consume resources, resulting in a denial of service. (CVE-2020-12100)
It was discovered that Dovecot incorrectly handled memory when using NTLM.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2020-12673)
It was discovered that the Dovecot RPA mechanism incorrectly handled
zero-length messages. A remote attacker could possibly use this issue to
cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12674)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 14.04
o dovecot-core - 1:2.2.9-1ubuntu2.6+esm3
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-12100
o CVE-2020-12673
o CVE-2020-12674
- --------------------------END INCLUDED TEXT--------------------
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