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AUSCERT External Security Bulletin Redistribution
ESB-2021.0026
USN-4674-1 and USN-4674-2: Dovecot vulnerabilities
5 January 2021
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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
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-25275 CVE-2020-24386
Original Bulletin:
https://ubuntu.com/security/notices/USN-4674-1
https://ubuntu.com/security/notices/USN-4674-2
Comment: 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.
This bulletin contains two (2) Ubuntu security advisories.
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USN-4674-1: Dovecot vulnerabilities
04 January 2021
Several security issues were fixed in Dovecot.
Releases
o Ubuntu 20.10
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 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
o dovecot-core - 1:2.3.11.3+dfsg1-2ubuntu0.1
Ubuntu 20.04
o dovecot-core - 1:2.3.7.2-1ubuntu3.3
Ubuntu 18.04
o dovecot-core - 1:2.2.33.2-1ubuntu4.7
Ubuntu 16.04
o dovecot-core - 1:2.2.22-1ubuntu2.14
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-24386
o CVE-2020-25275
Related notices
o USN-4674-2 : dovecot-core, dovecot
- --------------------------------------------------------------------------------
USN-4674-2: Dovecot vulnerability
04 January 2021
Dovecot could be made to denial of service if it received a specially
crafted MIME.
Releases
o Ubuntu 14.04 ESM
Packages
o 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
o dovecot-core - 1:2.2.9-1ubuntu2.6+esm4
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-25275
Related notices
o USN-4674-1 : dovecot, dovecot-core
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