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From: Marc Deslauriers
Reply-To: Ubuntu Security
To: "ubuntu-security-announce@lists.ubuntu.com"
Message-ID:
Subject: [USN-4993-1] Dovecot vulnerabilities
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==========================================================================
Ubuntu Security Notice USN-4993-1
June 21, 2021
dovecot vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in Dovecot.
Software Description:
- dovecot: IMAP and POP3 email server
Details:
Kirin discovered that Dovecot incorrectly escaped kid and azp fields in JWT
tokens. A local attacker could possibly use this issue to validate tokens
using arbitrary keys. This issue only affected Ubuntu 20.10 and Ubuntu
21.04. (CVE-2021-29157)
Fabian Ising and Damian Poddebniak discovered that Dovecot incorrectly
handled STARTTLS when using the SMTP submission service. A remote attacker
could possibly use this issue to inject plaintext commands before
STARTTLS negotiation. (CVE-2021-33515)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
dovecot-core 1:2.3.13+dfsg1-1ubuntu1.1
Ubuntu 20.10:
dovecot-core 1:2.3.11.3+dfsg1-2ubuntu0.2
Ubuntu 20.04 LTS:
dovecot-core 1:2.3.7.2-1ubuntu3.4
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4993-1
CVE-2021-29157, CVE-2021-33515
Package Information:
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.13+dfsg1-1ubuntu1.1
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.11.3+dfsg1-2ubuntu0.2
https://launchpad.net/ubuntu/+source/dovecot/1:2.3.7.2-1ubuntu3.4
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