Description
plugins/acl/acl-backend-vfile.c in Dovecot 1.2.x before 1.2.15 and 2.0.x before 2.0.5 interprets an ACL entry as a directive to add to the permissions granted by another ACL entry, instead of a directive to replace the permissions granted by another ACL entry, in certain circumstances involving more specific entries that occur after less specific entries, which allows remote authenticated users to bypass intended access restrictions via a request to read or modify a mailbox.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dovecot | 1:1.2.15-1 | — |
| Debian 13 | dovecot | 1:1.2.15-1 | — |
| Debian 12 | dovecot | 1:1.2.15-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | dovecot +4 | 1:2.0.9-2.el6 | RHSA-2011:0600 |
Advisories 1
- RHSA-2011:0600 Red Hat Security Advisory: dovecot security and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- [oss-security] 20101004 Re: CVE Request: more dovecot ACL issues mailing-list
- USN-1059-1 vendor-advisory
- SUSE-SR:2010:020 vendor-advisory
- ADV-2010-2572 vdb-entry
- [oss-security] 20101004 CVE Request: more dovecot ACL issues mailing-list
- MDVSA-2010:217 vendor-advisory
- 43220 third-party-advisory
- ADV-2011-0301 vdb-entry
- [dovecot] 20101002 v1.2.15 released mailing-list
- [dovecot] 20101002 ACL handling bugs in v1.2.8+ and v2.0 mailing-list
- RHSA-2011:0600 vendor-advisory
- ADV-2010-2840 vdb-entry
- [dovecot] 20101002 v2.0.5 released mailing-list