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    ArchLinux: 202011-23: matrix-synapse: denial of service

    Date 05 Dec 2020
    Posted By LinuxSecurity Advisories
    The package matrix-synapse before version 1.20.1-1 is vulnerable to denial of service.
    Arch Linux Security Advisory ASA-202011-23
    Severity: High
    Date    : 2020-11-26
    CVE-ID  : CVE-2020-26890
    Package : matrix-synapse
    Type    : denial of service
    Remote  : Yes
    Link    :
    The package matrix-synapse before version 1.20.1-1 is vulnerable to
    denial of service.
    Upgrade to 1.20.1-1.
    # pacman -Syu "matrix-synapse>=1.20.1-1"
    The problem has been fixed upstream in version 1.20.1.
    Matrix Synapse before 1.20.0 erroneously permits non-standard NaN,
    Infinity, and -Infinity JSON values in fields of events,
    allowing remote attackers to execute a denial of service attack against
    the federation and common Matrix clients. If such a malformed event is
    accepted into the room's state, the impact is long-lasting and is not
    fixed by an upgrade to a newer version, requiring the event to be
    manually redacted instead. Since events are replicated to servers of
    other room members, the impact is not constrained to the server of the
    event sender.
    A remote attacker might be able to cause a denial of service via a
    crafted event.

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