CVE-2019-11340 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fc https://github.com/matrix-org/sydent/compare/7c002cd…09278fb https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/ https://twitter.com/matrixdotorg/status/1118934335963500545

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.9