Synapse is an open-source Matrix homeserver. In Synapse versions before 1.120.1, enabling the dynamic_thumbnails option or processing a specially crafted request could trigger the decoding and thumbnail generation of uncommon image formats, potentially invoking external tools like Ghostscript for processing. This significantly expands the attack surface in a historically vulnerable area, presenting a risk that far outweighs the benefit, particularly since these formats are rarely used on the open web or within the Matrix ecosystem. Synapse 1.120.1 addresses the issue by restricting thumbnail generation to images in the following widely used formats: PNG, JPEG, GIF, and WebP. This vulnerability is fixed in 1.120.1.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 71f3e9f0-bafc-11ef-885d-901b0e934d69 advisory.

    element-hq/synapse developers report:
    [The 1.120.1] release fixes multiple security                     vulnerabilities, some affecting all prior versions of                     Synapse. Server administrators are encouraged to                     update Synapse as soon as possible. We are not aware                     of these vulnerabilities being exploited in the                     wild.
    Administrators who are unable to update Synapse may                     use the workarounds described in the linked GitHub                     Security Advisory below.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-4cadba7a29 advisory.

    CVE-2024-52805, CVE-2024-52815, CVE-2024-53863, CVE-2024-53867

    ----

    Backport fixes from v1.120.1

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-995720f767 advisory.

    CVE-2024-52805, CVE-2024-52815, CVE-2024-53863

    ----

    Backport fixes from v1.120.1

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
213068	FreeBSD : py-matrix-synapse -- multiple vulnerabilities in versions prior to 1.120.1 (71f3e9f0-bafc-11ef-885d-901b0e934d69)	Nessus	FreeBSD Local Security Checks	high
212753	Fedora 41 : matrix-synapse (2024-4cadba7a29)	Nessus	Fedora Local Security Checks	high
212749	Fedora 40 : matrix-synapse (2024-995720f767)	Nessus	Fedora Local Security Checks	high

Detections

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CVE-2024-53863

high

Tenable Plugins

high

high

high