ESB-2021.2195 – [UNIX/Linux][Ubuntu] Dovecot: Multiple vulnerabilities

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AUSCERT External Security Bulletin Redistribution

ESB-2021.2195
USN-4993-1: Dovecot vulnerabilities
22 June 2021

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AusCERT Security Bulletin Summary
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Product: Dovecot
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands — Existing Account
Access Confidential Data — Existing Account
Reduced Security — Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-33515 CVE-2021-29157

Original Bulletin:
https://ubuntu.com/security/notices/USN-4993-1

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.

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USN-4993-1: Dovecot vulnerabilities
21 June 2021

Several security issues were fixed in Dovecot.
Releases

o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS

Packages

o 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

o dovecot-core – 1:2.3.13+dfsg1-1ubuntu1.1

Ubuntu 20.10

o dovecot-core – 1:2.3.11.3+dfsg1-2ubuntu0.2

Ubuntu 20.04

o dovecot-core – 1:2.3.7.2-1ubuntu3.4

In general, a standard system update will make all the necessary changes.

References

o CVE-2021-29157
o CVE-2021-33515

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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
AusCERT did not write the document quoted above, AusCERT has had no control
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which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
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Previous advisories and external security bulletins can be retrieved from:

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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