Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resulting in a denial of service. Servers in private federations, or those that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or leave the room and purge the room using the admin API.

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

  - Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room     with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the     V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the     database of such instances, resulting in a denial of service. Servers in private federations, or those     that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some     workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or     leave the room and purge the room using the admin API. (CVE-2024-31208)

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 is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room
    with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the
    V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the
    database of such instances, resulting in a denial of service. Servers in private federations, or those
    that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some
    workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or
    leave the room and purge the room using the admin API. (CVE-2024-31208)

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7444-1 advisory.

    It was discovered that Synapse network policies could be bypassed via specially crafted URLs. An attacker     could possibly use this issue to bypass authentication mechanisms. (CVE-2023-32683)

    It was discovered that Synapse exposed cached device information. An attacker could possibly use this     issue to gain access to sensitive information. (CVE-2023-43796)

    It was discovered that Synapse could be tricked into rejecting state changes in rooms. An attacker could     possibly use this issue to cause Synapse to stop functioning properly, resulting in a denial of service.
    This issue was only fixed in Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-39374)

    It was discovered that Synapse stored user credentials in a server's database temporarily. An attacker     could possibly use this issue to gain access to sensitive information. This issue was only fixed in Ubuntu     22.04 LTS. (CVE-2023-41335)

    It was discovered that Synapse could incorrectly respond to server authorization events. An attacker could     possibly use this issue to bypass authentication mechanisms. This issue was only fixed in Ubuntu 22.04     LTS. (CVE-2022-39335)

    It was discovered that Synapse could be manipulated to mark messages as read when they had not been     viewed. An attacker could possibly use this issue to perform repudiation-based attacks. This issue was     only fixed in Ubuntu 22.04 LTS. (CVE-2023-42453)

    It was discovered that Synapse had several memory-related issues. An attacker could possibly use this     issue to cause Synapse to crash, resulting in a denial of service. This issue was only fixed in Ubuntu     22.04 LTS. (CVE-2024-31208)

    It was discovered that Synapse could run external tools due to a unchecked thumbnail rendering routine. An     attacker could possibly use this issue to cause Synapse to crash, resulting in a denial of service, or     execute arbitrary code. This issue was only fixed in Ubuntu 22.04 LTS. (CVE-2024-53863)

Tenable has extracted the preceding description block directly from the Ubuntu 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 packages installed that are affected by a vulnerability as referenced in the FEDORA-2024-3ff83cb806 advisory.

    Update matrix-synapse to v1.105.1 (CVE-2024-31208)

    ----

    Update to v1.105.0

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

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

The remote Fedora 38 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2024-7be0693731 advisory.

    Update matrix-synapse to v1.105.1 (CVE-2024-31208)

    ----

    Update to v1.105.0

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

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

The remote Fedora 39 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2024-d408b654d6 advisory.

    Update matrix-synapse to v1.105.1 (CVE-2024-31208)

    ----

    Update to v1.105.0

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

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

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the bdfa6c04-027a-11ef-9c21-901b0e9408dc advisory.

  - Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room     with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the     V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the     database of such instances, resulting in a denial of service. Servers in private federations, or those     that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some     workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or     leave the room and purge the room using the admin API. (CVE-2024-31208)

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

ID	Name	Product	Family	Severity
258314	Linux Distros Unpatched Vulnerability : CVE-2024-31208	Nessus	Misc.	medium
427100	Alpine: multiple synapse packages: security update to 1.105.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
427100	Alpine: multiple synapse packages: security update to 1.105.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
234734	Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS : Synapse vulnerabilities (USN-7444-1)	Nessus	Ubuntu Local Security Checks	high
409540	SCA: security update for matrix-synapse (GHSA-3h7q-rfh9-xm4v)	Tenable Cloud Security	SCA Checks	medium
409540	SCA: security update for matrix-synapse (GHSA-3h7q-rfh9-xm4v)	Tenable Self-Hosted Container Security	SCA Checks	medium
194934	Fedora 40 : matrix-synapse / rust-pythonize (2024-3ff83cb806)	Nessus	Fedora Local Security Checks	medium
194932	Fedora 38 : matrix-synapse / rust-pythonize (2024-7be0693731)	Nessus	Fedora Local Security Checks	medium
194930	Fedora 39 : matrix-synapse / rust-pythonize (2024-d408b654d6)	Nessus	Fedora Local Security Checks	medium
193887	FreeBSD : py-matrix-synapse -- weakness in auth chain indexing allows DoS (bdfa6c04-027a-11ef-9c21-901b0e9408dc)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2024-31208

medium

Tenable Plugins

medium

medium

medium

high

medium

medium

medium

medium

medium

medium