CVE-2020-28896

NameCVE-2020-28896
DescriptionMutt before 2.0.2 and NeoMutt before 2020-11-20 did not ensure that $ssl_force_tls was processed if an IMAP server's initial server response was invalid. The connection was not properly closed, and the code could continue attempting to authenticate. This could result in authentication credentials being exposed on an unencrypted connection, or to a machine-in-the-middle.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2472-1
NVD severitylow

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
mutt (PTS)stretch1.7.2-1+deb9u3vulnerable
stretch (security)1.7.2-1+deb9u5fixed
buster, buster (security)1.10.1-2.1+deb10u5fixed
bookworm, sid, bullseye2.0.5-4.1fixed
neomutt (PTS)buster20180716+dfsg.1-1+deb10u2fixed
buster (security)20180716+dfsg.1-1+deb10u1vulnerable
bookworm, sid, bullseye20201127+dfsg.1-1.2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
muttsourcestretch1.7.2-1+deb9u4DLA-2472-1
muttsourcebuster1.10.1-2.1+deb10u4
muttsource(unstable)2.0.2-1
neomuttsourcebuster20180716+dfsg.1-1+deb10u2
neomuttsource(unstable)20201120+dfsg.1-1

Notes

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

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