CVE-2021-31855

Name	CVE-2021-31855
Description	KDE Messagelib through 5.17.0 reveals cleartext of encrypted messages in some situations. Deleting an attachment of a decrypted encrypted message stored on a remote server (e.g., an IMAP server) causes KMail to upload the decrypted content of the message to the remote server. With a crafted message, a user could be tricked into decrypting an encrypted message and then deleting an attachment attached to this message. If the attacker has access to the messages stored on the email server, then the attacker could read the decrypted content of the encrypted message. This occurs in ViewerPrivate::deleteAttachment in messageviewer/src/viewer/viewer_p.cpp.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	989438

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
kdepim4 (PTS)	stretch	4:4.14.10-7	vulnerable
kf5-messagelib (PTS)	stretch	4:16.04.3-3~deb9u1	vulnerable
	buster	4:18.08.3-2	vulnerable
	bullseye	4:20.08.3-5	fixed
	bookworm	4:22.12.3-2~deb12u1	fixed
	sid, trixie	4:22.12.3-3	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
kdepim4	source	(unstable)	(unfixed)
kf5-messagelib	source	(unstable)	4:20.08.3-5			989438

Notes

[buster] - kf5-messagelib <no-dsa> (Minor issue)
[stretch] - kf5-messagelib <no-dsa> (Minor issue)
[stretch] - kdepim4 <no-dsa> (Minor issue)
https://kde.org/info/security/advisory-20210429-1.txt
https://commits.kde.org/messagelib/3b5b171e91ce78b966c98b1292a1bcbc8d984799