CVE-2021-29157 log

Source
Severity Medium
Remote No
Type Information disclosure
Description 
A security issue has been found in Dovecot before version 2.3.14.1. The kid and azp fields in JWT tokens are not correctly escaped. This may be used to supply attacker controlled keys to validate tokens in some configurations. The attack requires an attacker to be able to write files to the local disk. As a result, a local attacker can login as any user and access their emails.
Group Package Affected Fixed Severity Status Ticket
AVG-2087 dovecot 2.3.14-2 2.3.15-1 High Fixed
Date Advisory Group Package Severity Type
22 Jun 2021 ASA-202106-56 AVG-2087 dovecot High information disclosure
References 
https://dovecot.org/pipermail/dovecot-news/2021-June/000461.html
https://www.openwall.com/lists/oss-security/2021/06/28/1
https://github.com/dovecot/core/commit/7f06f6274437ea97142df1f64f322b3ced44d0b3
https://github.com/dovecot/core/commit/7a77e070ddb6a67fe7a40118ba3e3f9b6062a7d1
https://github.com/dovecot/core/commit/bae4e44596d6548322665d242b055f44fe1dc58d
Notes 
Workaround
==========

Disable local JWT validation in oauth2, or use a different dict driver than fs:posix.