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    ArchLinux: 202011-8: sddm: privilege escalation

    Date 10 Nov 2020
    1675
    Posted By LinuxSecurity Advisories
    The package sddm before version 0.19.0-1 is vulnerable to privilege escalation.
    Arch Linux Security Advisory ASA-202011-8
    =========================================
    
    Severity: Medium
    Date    : 2020-11-10
    CVE-ID  : CVE-2020-28049
    Package : sddm
    Type    : privilege escalation
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1266
    
    Summary
    =======
    
    The package sddm before version 0.19.0-1 is vulnerable to privilege
    escalation.
    
    Resolution
    ==========
    
    Upgrade to 0.19.0-1.
    
    # pacman -Syu "sddm>=0.19.0-1"
    
    The problem has been fixed upstream in version 0.19.0.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    A local privilege escalation has been discovered in the sddm display
    manager < 0.19.0. If the auth file is empty, X allows any local
    application (= any user on the system) to connect. This is currently
    the case until X wrote the display number to sddm and sddm used that to
    write the entry into the file.
    
    Impact
    ======
    
    A local user might be able to escalate privileges.
    
    References
    ==========
    
    https://www.openwall.com/lists/oss-security/2020/11/04/2
    https://github.com/sddm/sddm/commit/be202f533ab98a684c6a007e8d5b4357846bc222
    https://security.archlinux.org/CVE-2020-28049
    
    

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