Bug 1912460 (CVE-2020-25275) - CVE-2020-25275 dovecot: Denial of service via mail MIME parsing
Summary: CVE-2020-25275 dovecot: Denial of service via mail MIME parsing
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-25275
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1912461 1914019 1914020
Blocks: 1912462
TreeView+ depends on / blocked
 
Reported: 2021-01-04 14:43 UTC by Pedro Sampaio
Modified: 2021-05-18 20:38 UTC (History)
4 users (show)

Fixed In Version: dovecot 2.3.13
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Clone Of:
Environment:
Last Closed: 2021-05-18 20:38:04 UTC
Embargoed:

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Description Pedro Sampaio 2021-01-04 14:43:51 UTC 
A flaw was found in dovecot before version 2.3.13. Mail parsing crashed when the 10 000th MIME part was message/rfc822 (or if parent was multipart/digest). This happened due to earlier MIME parsing changes for CVE-2020-12100.

References:

https://www.openwall.com/lists/oss-security/2021/01/04/3
https://dovecot.org/pipermail/dovecot-news/2021-January/000448.html
Comment 1 Pedro Sampaio 2021-01-04 14:44:19 UTC 
Created dovecot tracking bugs for this issue:

Affects: fedora-all [bug 1912461]
Comment 2 Todd Cullum 2021-01-08 00:51:53 UTC 
Upstream commits:
https://github.com/dovecot/core/commit/266e54b7b8c34c9a58dd60a2e53c5ca7d1deae19
https://github.com/dovecot/core/commit/fb97a1cddbda4019e327fa736972a1c7433fedaa
Comment 4 Todd Cullum 2021-01-08 01:04:04 UTC 
Mitigation:

A potential mitigation is configuring the mail transfer agent to not accept messages with more than 10,000 MIME parts.
Comment 5 Todd Cullum 2021-01-08 01:15:44 UTC 
External References:

https://dovecot.org/pipermail/dovecot-news/2021-January/000448.html
Comment 6 errata-xmlrpc 2021-05-18 15:51:53 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 7 Product Security DevOps Team 2021-05-18 20:38:04 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-2020-25275
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