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Open Redirect Affecting matrix-synapse package, versions [,1.28.0)

0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Integrity High

    Threat Intelligence

    EPSS 0.09% (36th percentile)
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NVD
6.3 medium

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  • Snyk ID SNYK-PYTHON-MATRIXSYNAPSE-1245051
  • published 13 Apr 2021
  • disclosed 13 Apr 2021
  • credit mscherer
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Introduced: 13 Apr 2021

CVE-2021-21392 Open this link in a new tab
CWE-601 Open this link in a new tab

How to fix?

Upgrade matrix-synapse to version 1.28.0 or higher.

Overview

matrix-synapse is an ecosystem for open federated Instant Messaging and VoIP.

Affected versions of this package are vulnerable to Open Redirect. Requests to user provided domains are not restricted to external IP addresses when transitional IPv6 addresses are 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 can cause Synapse to make requests to internal infrastructure on dual-stack networks.

References