==========================================================================
Ubuntu Security Notice USN-4674-2
January 04, 2021
dovecot vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 14.04 ESM
Summary:
Dovecot could be made to denial of service if it received a specially
crafted MIME.
Software Description:
– dovecot: IMAP and POP3 email server
Details:
USN-4674-1 fixed a vulnerability in Dovecot. This update provides
the corresponding update for Ubuntu 14.04 ESM.
Original advisory details:
Innokentii Sennovskiy discovered that Dovecot incorrectly handled MIME
parsing. A remote attacker could possibly use this issue to cause Dovecot
to crash, resulting in a denial of service. (CVE-2020-25275)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 ESM:
dovecot-core 1:2.2.9-1ubuntu2.6+esm4
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4674-2
https://usn.ubuntu.com/4674-1
CVE-2020-25275
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—
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==========================================================================
Ubuntu Security Notice USN-4674-1
January 04, 2021
dovecot vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10
– Ubuntu 20.04 LTS
– Ubuntu 18.04 LTS
– Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Dovecot.
Software Description:
– dovecot: IMAP and POP3 email server
Details:
It was discovered that Dovecot incorrectly handled certain imap hibernation
commands. A remote authenticated attacker could possibly use this issue to
access other users’ email. This issue only affected Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2020-24386)
Innokentii Sennovskiy discovered that Dovecot incorrectly handled MIME
parsing. A remote attacker could possibly use this issue to cause Dovecot
to crash, resulting in a denial of service. (CVE-2020-25275)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.10:
dovecot-core 1:2.3.11.3+dfsg1-2ubuntu0.1
Ubuntu 20.04 LTS:
dovecot-core 1:2.3.7.2-1ubuntu3.3
Ubuntu 18.04 LTS:
dovecot-core 1:2.2.33.2-1ubuntu4.7
Ubuntu 16.04 LTS:
dovecot-core 1:2.2.22-1ubuntu2.14
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4674-1
CVE-2020-24386, CVE-2020-25275
Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.11.3+dfsg1-2ubuntu0.1
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.7.2-1ubuntu3.3
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.33.2-1ubuntu4.7
https://launchpad.net/ubuntu/+source/dovecot/1:2.2.22-1ubuntu2.14
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