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CVE-2022-30550

Status Candidate

Overview

An issue was discovered in the auth component in Dovecot 2.2 and 2.3 before 2.3.20. When two passdb configuration entries exist with the same driver and args settings, incorrect username_filter and mechanism settings can be applied to passdb definitions. These incorrectly applied settings can lead to an unintended security configuration and can permit privilege escalation in certain configurations. The documentation does not advise against the use of passdb definitions that have the same driver and args settings. One such configuration would be where an administrator wishes to use the same PAM configuration or passwd file for both normal and master users but use the username_filter setting to restrict which of the users is able to be a master user.

Related Files

Ubuntu Security Notice USN-5509-1
Posted Jul 12, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5509-1 - Julian Brook discovered that Dovecot incorrectly handled multiple passdb configuration entries. In certain configurations, a remote attacker could possibly use this issue to escalate privileges.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2022-30550
SHA-256 | b5cd6d6448708528023e5f33f75e0a96cd077e0c2d7dfbf1872d55128a572bfa
Dovecot IMAP Server 2.2 Improper Access Control
Posted Jul 7, 2022
Authored by Julian Brook

Dovecot IMAP server version 2.2 suffers from a privilege escalation vulnerability. When two passdb configuration entries exist in the Dovecot configuration, which have the same driver and args settings, the incorrect username_filter and mechanism settings can be applied to passdb definitions. These incorrectly applied settings can lead to an unintended security configuration and can permit privilege escalation with certain configurations involving master user authentication.

tags | advisory, imap
advisories | CVE-2022-30550
SHA-256 | c9c1a6dcc53febbada1b722a950a737522f4c2987b34eb7b27226ddd2a58c66b
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