Bug 1900826 (CVE-2020-28896) - CVE-2020-28896 mutt: Incorrect handling of invalid initial IMAP responses could lead to an authentication attempt over unencrypted connection
Summary: CVE-2020-28896 mutt: Incorrect handling of invalid initial IMAP responses cou...
Keywords:
Status: NEW
Alias: CVE-2020-28896
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: 1901316 1900827 1910624
Blocks: 1900828
TreeView+ depends on / blocked
 
Reported: 2020-11-23 19:37 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-10-04 20:03 UTC (History)
8 users (show)

Fixed In Version: mutt 2.0.2
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Description Guilherme de Almeida Suckevicz 2020-11-23 19:37:24 UTC
Mutt had incorrect error handling when initially connecting to an IMAP server, which could result in an attempt to authenticate without enabling TLS.

References:
http://lists.mutt.org/pipermail/mutt-announce/Week-of-Mon-20201116/000031.html
https://mailman.neomutt.org/pipermail/neomutt-users-neomutt.org/2020-November/000929.html

Upstream patchs:
https://gitlab.com/muttmua/mutt/-/commit/04b06aaa3e0cc0022b9b01dbca2863756ebbf59a
https://github.com/neomutt/neomutt/commit/9c36717a3e2af1f2c1b7242035455ec8112b4b06

Comment 1 Guilherme de Almeida Suckevicz 2020-11-23 19:37:41 UTC
Created mutt tracking bugs for this issue:

Affects: fedora-all [bug 1900827]

Comment 3 Todd Cullum 2020-11-24 20:24:51 UTC
Statement:

Red Hat Product Security has rated the severity of this flaw as Moderate because although the Confidentiality impact is high, the attack complexity is also high as a particular attacker would at least need to coordinate social engineering a victim to connect to a bad server, and also perform a man-in-the-middle attack or perform similar interception of the connection. Please see the following page for details on Red Hat severity ratings with special attention to Moderate: https://access.redhat.com/security/updates/classification .


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