Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for media stream URLs without properly limiting connection time. Connections will only be terminated after `max_spider_size` (default: 10M) bytes have been downloaded, which can in some cases lead to long-lived connections towards the streaming media server (for instance, Icecast). This can cause excessive traffic and connections toward such servers if their stream URL is, for example, posted to a large room with many Synapse instances with URL preview enabled. Version 1.52.0 implements a timeout mechanism which will terminate URL preview connections after 30 seconds. Since generating URL previews for media streams is not supported and always fails, 1.53.0 additionally implements an allow list for content types for which Synapse will even attempt to generate a URL preview. Upgrade to 1.53.0 to fully resolve the issue. As a workaround, turn off URL preview functionality by setting `url_preview_enabled: false` in the Synapse configuration file.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for     media stream URLs without properly limiting connection time. Connections will only be terminated after     `max_spider_size` (default: 10M) bytes have been downloaded, which can in some cases lead to long-lived     connections towards the streaming media server (for instance, Icecast). This can cause excessive traffic     and connections toward such servers if their stream URL is, for example, posted to a large room with many     Synapse instances with URL preview enabled. Version 1.52.0 implements a timeout mechanism which will     terminate URL preview connections after 30 seconds. Since generating URL previews for media streams is not     supported and always fails, 1.53.0 additionally implements an allow list for content types for which     Synapse will even attempt to generate a URL preview. Upgrade to 1.53.0 to fully resolve the issue. As a     workaround, turn off URL preview functionality by setting `url_preview_enabled: false` in the Synapse     configuration file. (CVE-2022-41952)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for
    media stream URLs without properly limiting connection time. Connections will only be terminated after
    `max_spider_size` (default: 10M) bytes have been downloaded, which can in some cases lead to long-lived
    connections towards the streaming media server (for instance, Icecast). This can cause excessive traffic
    and connections toward such servers if their stream URL is, for example, posted to a large room with many
    Synapse instances with URL preview enabled. Version 1.52.0 implements a timeout mechanism which will
    terminate URL preview connections after 30 seconds. Since generating URL previews for media streams is not
    supported and always fails, 1.53.0 additionally implements an allow list for content types for which
    Synapse will even attempt to generate a URL preview. Upgrade to 1.53.0 to fully resolve the issue. As a
    workaround, turn off URL preview functionality by setting `url_preview_enabled: false` in the Synapse
    configuration file. (CVE-2022-41952)

ID	Name	Product	Family	Type	Severity
257536	Linux Distros Unpatched Vulnerability : CVE-2022-41952	Nessus	Misc.	Local	medium
410036	SCA: security update for matrix-synapse (GHSA-4822-jvwx-w47h)	Tenable Cloud Security	SCA Checks	Local	medium
410036	SCA: security update for matrix-synapse (GHSA-4822-jvwx-w47h)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2022-41952

medium

Tenable Plugins

medium

medium

medium