Dovecot mail_extra_groups option unauthorized access
| dovecot-mailextragroups-unauth-access (41009) |  Medium Risk |
Description:
Dovecot could allow a local attacker to gain unauthorized access on the system, caused by an error when the mail_extra_groups option is enabled. By creating a symlink, an attacker could read, modify, and delete arbitrary files that have mail group permissions set.
Platforms Affected:
- Canonical, Ubuntu 6.06 LTS
- Canonical, Ubuntu 6.10
- Canonical, Ubuntu 7.04
- Canonical, Ubuntu 7.10
- Debian, Debian Linux 4.0
- Gentoo, Linux
- RedHat, Enterprise Linux 5
- RedHat, Enterprise Linux 5 Client Workstation
- Timo Sirainen, Dovecot prior to 1.0.11
Remedy:
Upgrade to the latest version of Dovecot (1.0.11 or later), available from the Dovecot Web site. See References.
Consequences:
File Manipulation
References:
- BugTraq Mailing List, Tue Mar 04 2008 - 00:47:53 CST, Dovecot mail_extra_groups setting is often used insecurely at http://archives.neohapsis.com/archives/bugtraq/2008-03/0042.html.
- Dovecot Changelog, Tue Mar 4 08:37:56 EET 2008, [Dovecot-news] v1.0.11 released at http://www.dovecot.org/list/dovecot-news/2008-March/000061.html.
- Dovecot Web site, Dovecot at http://www.dovecot.org/.
- BID-28092: Dovecot 'mail_extra_groups' Insecure Settings Local Unauthorized Access Vulnerability
- CVE-2008-1199: Dovecot before 1.0.11, when configured to use mail_extra_groups to allow Dovecot to create dotlocks in /var/mail, might allow local users to read sensitive mail files for other users, or modify files or directories that are writable by group, via a symlink attack.
- DSA-1516: dovecot -- privilege escalation
- GLSA-200803-25: Dovecot: Multiple vulnerabilities
- RHSA-2008-0297: Low: dovecot security and bug fix update
- USN-593-1: Dovecot vulnerabilities
Reported:
Mar 04, 2008
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