Описание
HTML injection in email and account expiry notifications
Impact
The notification emails sent for notifications for missed messages or for an expiring account are subject to HTML injection. In the case of the notification for missed messages, this could allow an attacker to insert forged content into the email.
The account expiry feature is not enabled by default and the HTML injection is not controllable by an attacker.
Patches
This issue is fixed in #9200.
Workarounds
For the missed messages notifications:
The notif.html, notif_mail.html, and room.html templates can be overridden with custom templates that manually escapes the variables using JInja2's escape filter. See the email.template_dir setting.
For the account expiry notifications:
-
Account expiry can be disabled via the
account_validity.enabledsetting. -
The
notice_expiry.htmltemplate can be overridden with a custom template that manually escapes the variables using JInja2'sescapefilter. See theemail.template_dirsetting.
Ссылки
- https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm
- https://nvd.nist.gov/vuln/detail/CVE-2021-21333
- https://github.com/matrix-org/synapse/pull/9200
- https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df
- https://github.com/matrix-org/synapse/releases/tag/v1.27.0
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-134.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY
Пакеты
matrix-synapse
< 1.27.0
1.27.0
EPSS
4.9 Medium
CVSS4
6.1 Medium
CVSS3
CVE ID
Дефекты
Связанные уязвимости
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.27.0, the notification emails sent for notifications for missed messages or for an expiring account are subject to HTML injection. In the case of the notification for missed messages, this could allow an attacker to insert forged content into the email. The account expiry feature is not enabled by default and the HTML injection is not controllable by an attacker. This is fixed in version 1.27.0.
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.27.0, the notification emails sent for notifications for missed messages or for an expiring account are subject to HTML injection. In the case of the notification for missed messages, this could allow an attacker to insert forged content into the email. The account expiry feature is not enabled by default and the HTML injection is not controllable by an attacker. This is fixed in version 1.27.0.
Synapse is a Matrix reference homeserver written in python (pypi packa ...
EPSS
4.9 Medium
CVSS4
6.1 Medium
CVSS3