Bug 1866309 (CVE-2020-12100) - CVE-2020-12100 dovecot: Resource exhaustion via deeply nested MIME parts
Summary: CVE-2020-12100 dovecot: Resource exhaustion via deeply nested MIME parts
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-12100
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1866751 1866752 1866753 1866754 1866755 1866756 1868539 1871841
Blocks: 1866310
TreeView+ depends on / blocked
 
Reported: 2020-08-05 10:51 UTC by Huzaifa S. Sidhpurwala
Modified: 2021-02-16 19:32 UTC (History)
5 users (show)

Fixed In Version: dovecot 2.3.11
Clone Of:
Environment:
Last Closed: 2020-09-03 13:17:44 UTC
Embargoed:

Attachments (Terms of Use)
CVE-2020-12100 patch from upstream (115.30 KB, patch)
2020-08-06 03:39 UTC, Huzaifa S. Sidhpurwala 		no flags Details | Diff
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:3617 0 None None None 2020-09-03 10:34:41 UTC
Red Hat Product Errata RHSA-2020:3713 0 None None None 2020-09-10 12:59:59 UTC
Red Hat Product Errata RHSA-2020:3735 0 None None None 2020-09-14 12:42:41 UTC
Red Hat Product Errata RHSA-2020:3736 0 None None None 2020-09-14 12:46:08 UTC

Description Huzaifa S. Sidhpurwala 2020-08-05 10:51:43 UTC 
As per upstream:

Vulnerability Details:
Receiving mail with deeply nested MIME parts leads to resource exhaustion as Dovecot attempts to parse it.

Risk:
Malicious actor can cause denial of service to mail delivery by repeatedly sending mails with bad content.
Comment 2 Huzaifa S. Sidhpurwala 2020-08-06 03:39:37 UTC 
Created attachment 1710593 [details]
CVE-2020-12100 patch from upstream
Comment 4 Huzaifa S. Sidhpurwala 2020-08-06 03:47:10 UTC 
Mitigation:

Upstream suggests that this flaw can be mitigated by limiting MIME structures in MTA
Comment 6 Huzaifa S. Sidhpurwala 2020-08-06 09:33:03 UTC 
Acknowledgments:

Name: the Dovecot project
Comment 7 Huzaifa S. Sidhpurwala 2020-08-13 03:47:39 UTC 
External References:

https://dovecot.org/pipermail/dovecot-news/2020-August/000441.html
Comment 8 Huzaifa S. Sidhpurwala 2020-08-13 03:50:54 UTC 
Created dovecot tracking bugs for this issue:

Affects: fedora-all [bug 1868539]
Comment 12 errata-xmlrpc 2020-09-03 10:34:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3617 https://access.redhat.com/errata/RHSA-2020:3617
Comment 13 Product Security DevOps Team 2020-09-03 13:17:44 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-2020-12100
Comment 18 errata-xmlrpc 2020-09-10 12:59:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:3713 https://access.redhat.com/errata/RHSA-2020:3713
Comment 21 errata-xmlrpc 2020-09-14 12:42:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

Via RHSA-2020:3735 https://access.redhat.com/errata/RHSA-2020:3735
Comment 22 errata-xmlrpc 2020-09-14 12:46:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2020:3736 https://access.redhat.com/errata/RHSA-2020:3736
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