NVD Vulnerability Detail

CVE-2021-21333

Summary	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.
Publication Date	March 27, 2021, 5:15 a.m.
Registration Date	March 27, 2021, 12:02 p.m.
Last Update	Nov. 21, 2024, 2:48 p.m.

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:a:matrix:synapse::::::::					1.27.0

Configuration2		or higher	or less	more than	less than
cpe:2.3:o:fedoraproject:fedora:34:::::::*

Related information, measures and tools

No	URL	タグ
1	https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df	Patch Third Party Advisory
2	https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df	Patch Third Party Advisory
3	https://github.com/matrix-org/synapse/pull/9200	Patch Third Party Advisory
4	https://github.com/matrix-org/synapse/pull/9200	Patch Third Party Advisory
5	https://github.com/matrix-org/synapse/releases/tag/v1.27.0	Third Party Advisory
6	https://github.com/matrix-org/synapse/releases/tag/v1.27.0	Third Party Advisory
7	https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm	Patch Third Party Advisory
8	https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm	Patch Third Party Advisory
9	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/
10	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-79	クロスサイト・スクリプティング（XSS）	https://cwe.mitre.org/data/definitions/79.html

JVN Vulnerability Information

Synapse におけるインジェクションに関する脆弱性

Title	Synapse におけるインジェクションに関する脆弱性
Summary	Synapse には、インジェクションに関する脆弱性が存在します。
Possible impacts	情報を改ざんされる可能性があります。
Solution	ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date	Feb. 16, 2021, midnight
Registration Date	April 6, 2021, 2:39 p.m.
Last Update	April 6, 2021, 2:39 p.m.

Affected System

Matrix

Synapse 1.27.0 未満

CVE (情報セキュリティ共通脆弱性識別子)

No	Name	URL
Common Vulnerabilities and Exposures (CVE)
1	CVE-2021-21333	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21333
National Vulnerability Database (NVD)
2	CVE-2021-21333	https://nvd.nist.gov/vuln/detail/CVE-2021-21333

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-74	https://cwe.mitre.org/data/definitions/74.html

ベンダー情報

No	Name	URL
GitHub
1	Clean-up the template loading code #9200	https://github.com/matrix-org/synapse/pull/9200
2	Clean-up the template loading code. (#9200)	https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df
3	HTML injection in email and account expiry notifications	https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm
4	Synapse 1.27.0 (2021-02-16)	https://github.com/matrix-org/synapse/releases/tag/v1.27.0

Change Log

No	Changed Details	Date of change
1	[2021年04月06日] 掲載	April 6, 2021, 2:39 p.m.