CVSS: 5.3EPSS: 0%CPEs: 2EXPL: 0CVE-2021-29471 – Denial of service in Matrix Synapse
https://notcve.org/view.php?id=CVE-2021-29471
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 1.33.2 "Push rules" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. • https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c https://github.com/matrix-org/synapse/releases/tag/v1.33.2 https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY • CWE-331: Insufficient Entropy CWE-400: Uncontrolled Resource Consumption •
CVSS: 6.3EPSS: 0%CPEs: 2EXPL: 0CVE-2021-21392 – Open redirect via transitional IPv6 addresses on dual-stack networks
https://notcve.org/view.php?id=CVE-2021-21392
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 1.28.0 requests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks. • https://github.com/matrix-org/synapse/pull/9240 https://github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY https://pypi.org/project/matrix-synapse • CWE-601: URL Redirection to Untrusted Site ('Open Redirect') •
CVSS: 6.5EPSS: 0%CPEs: 2EXPL: 0CVE-2021-21393 – Denial of service (via resource exhaustion) due to improper input validation on groups/communities endpoints
https://notcve.org/view.php?id=CVE-2021-21393
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 1.28.0 Synapse is missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. • https://github.com/matrix-org/synapse/pull/9321 https://github.com/matrix-org/synapse/pull/9393 https://github.com/matrix-org/synapse/security/advisories/GHSA-jrh7-mhhx-6h88 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY https://pypi.org/project/matrix-synapse • CWE-20: Improper Input Validation •
CVSS: 6.5EPSS: 0%CPEs: 2EXPL: 0CVE-2021-21394 – Denial of service (via resource exhaustion) due to improper input validation on third-party identifier endpoints
https://notcve.org/view.php?id=CVE-2021-21394
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 1.28.0 Synapse is missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. Note that the groups feature is not part of the Matrix specification and the chosen maximum lengths are arbitrary. Not all clients might abide by them. • https://github.com/matrix-org/synapse/pull/9321 https://github.com/matrix-org/synapse/pull/9393 https://github.com/matrix-org/synapse/security/advisories/GHSA-w9fg-xffh-p362 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY https://pypi.org/project/matrix-synapse • CWE-20: Improper Input Validation •
CVSS: 6.1EPSS: 0%CPEs: 2EXPL: 0CVE-2021-21333 – HTML injection in email and account expiry notifications
https://notcve.org/view.php?id=CVE-2021-21333
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. • https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df https://github.com/matrix-org/synapse/pull/9200 https://github.com/matrix-org/synapse/releases/tag/v1.27.0 https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY • CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •