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    ArchLinux: 202011-4: matrix-synapse: cross-site scripting

    Date 10 Nov 2020
    348
    Posted By LinuxSecurity Advisories
    The package matrix-synapse before version 1.21.0-1 is vulnerable to cross-site scripting.
    Arch Linux Security Advisory ASA-202011-4
    =========================================
    
    Severity: High
    Date    : 2020-11-03
    CVE-ID  : CVE-2020-26891
    Package : matrix-synapse
    Type    : cross-site scripting
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1252
    
    Summary
    =======
    
    The package matrix-synapse before version 1.21.0-1 is vulnerable to
    cross-site scripting.
    
    Resolution
    ==========
    
    Upgrade to 1.21.0-1.
    
    # pacman -Syu "matrix-synapse>=1.21.0-1"
    
    The problem has been fixed upstream in version 1.21.0.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    A security issue has been found in matrix-synapse before 1.21.0, where
    HTML pages served via Synapse were vulnerable to cross-site scripting
    (XSS) attacks.
    
    Impact
    ======
    
    A remote attacker might be able to spoof content and execute code via a
    cross-site scripting attack.
    
    References
    ==========
    
    https://github.com/matrix-org/synapse/releases/tag/v1.21.2
    https://github.com/matrix-org/synapse/pull/8444
    https://security.archlinux.org/CVE-2020-26891
    
    

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