Bug 1912455 (CVE-2020-24386) - CVE-2020-24386 dovecot: IMAP hibernation function allows mail access
Summary: CVE-2020-24386 dovecot: IMAP hibernation function allows mail access
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-24386
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1912456 1913534 1913535
Blocks: 1912462
TreeView+ depends on / blocked
 
Reported: 2021-01-04 14:36 UTC by Pedro Sampaio
Modified: 2021-05-18 20:38 UTC (History)
6 users (show)

Fixed In Version: dovecot 2.3.13
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Clone Of:
Environment:
Last Closed: 2021-05-18 20:38:01 UTC
Embargoed:

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Description Pedro Sampaio 2021-01-04 14:36:44 UTC 
A flaw was found in dovecot before version 2.3.13. When imap hibernation is active, an attacker can cause Dovecot to discover file system directory structure and access other users' emails using specially crafted command. The attacker must have valid credentials to access the mail server.

References:

https://www.openwall.com/lists/oss-security/2021/01/04/4
https://dovecot.org/pipermail/dovecot-news/2021-January/000448.html
Comment 1 Pedro Sampaio 2021-01-04 14:37:16 UTC 
Created dovecot tracking bugs for this issue:

Affects: fedora-all [bug 1912456]
Comment 3 Todd Cullum 2021-01-08 00:39:30 UTC 
Mitigation:

To mitigate this flaw, ensure that imap_hibernate_timeout is set to 0 or not set at all/commented out in both /etc/dovecot/dovecot.conf or /etc/dovecot/conf.d/20-imap.conf.
Comment 4 Todd Cullum 2021-01-08 00:47:33 UTC 
Upstream commit: https://github.com/dovecot/core/commit/62061e8cf68f506c0ccaaba21fd4174764ca875f
Comment 5 Todd Cullum 2021-01-08 01:16:02 UTC 
External References:

https://dovecot.org/pipermail/dovecot-news/2021-January/000448.html
Comment 9 errata-xmlrpc 2021-05-18 15:51:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1887 https://access.redhat.com/errata/RHSA-2021:1887
Comment 10 Product Security DevOps Team 2021-05-18 20:38:01 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-24386
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