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    CVE-2023-45129

    Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.

    Published:Oct 10, 2023
    Last Modified:Feb 13, 2025
    EPS:Oct 10, 2023
    EPSS Score:0.00252
    CVSS Score:4.9

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Matrix
    Product
    Synapse

    Exploits

    No exploit reference

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    References

    https://github.com/matrix-org/synapse/pull/16360
    https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4
    https://lists.fedoraproject.org/archives/list/[email protected]/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/
    https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version
    https://security.gentoo.org/glsa/202401-12
    https://github.com/matrix-org/synapse/pull/16360
    https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4
    https://lists.fedoraproject.org/archives/list/[email protected]/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/
    https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version
    https://security.gentoo.org/glsa/202401-12

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High