Matrix Sydent mishandles emails

GHSA-q9h8-gpw5-c95c · CVE-2019-11340

Published May 24, 2022 · Modified Nov 8, 2023

Description

util/emailutils.py in Matrix Sydent before 1.0.2 mishandles registration restrictions that are based on e-mail domain, if the allowed_local_3pids option is enabled. This occurs because of potentially unwanted behavior in Python, in which an email.utils.parseaddr call on user@bad.example.net@good.example.com returns the user@bad.example.net substring.

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2019-11340
WEB https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fc
WEB https://github.com/matrix-org/sydent/compare/7c002cd...09278fb
WEB https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2
WEB https://twitter.com/matrixdotorg/status/1118934335963500545

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