UBUNTU-CVE-2023-43796

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    UBUNTU-CVE-2023-43796

    Published: 31 Oct 2023Last Modified: 4 Feb 2026
    Upstream:
    CVE-2023-43796
    Aliases:
    USN-7444-1

    Summary:

    Details: Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.

    References: https://ubuntu.com/security/CVE-2023-43796, https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575, https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f, https://www.cve.org/CVERecord?id=CVE-2023-43796, https://ubuntu.com/security/notices/USN-7444-1

    Affected packages

    Package

    Name: matrix-synapse

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-1ubuntu0.1~esm4?arch=source&distro=esm-apps/bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.24.0+dfsg-1ubuntu0.1~esm4

    Affected versions

    0.19.2+dfsg-6

    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
    UBUNTU-CVE-2023-43796 | CVE-DB