4
CVSSv2

CVE-2021-31855

Published: 02/06/2021 Updated: 08/11/2023
CVSS v2 Base Score: 4 | Impact Score: 2.9 | Exploitability Score: 8
CVSS v3 Base Score: 6.5 | Impact Score: 3.6 | Exploitability Score: 2.8
VMScore: 356
Vector: AV:N/AC:L/Au:S/C:P/I:N/A:N

Vulnerability Summary

KDE Messagelib up to and including 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.

Vulnerability Trend

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kde messagelib

Vendor Advisories

Debian Bug report logs - #989438 CVE-2021-31855 Package: src:kf5-messagelib; Maintainer for src:kf5-messagelib is Debian Qt/KDE Maintainers <debian-qt-kde@listsdebianorg>; Reported by: Moritz Muehlenhoff <jmm@debianorg> Date: Thu, 3 Jun 2021 17:57:04 UTC Severity: grave Tags: security, upstream Found in version ...
Deleting an attachment of a decrypted encrypted message stored on a remote server (eg an IMAP server) causes KMail to upload the decrypted content of the message to the remote server This is not easily noticeable by the user because KMail does not display the decrypted content ...