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    ArchLinux: 202009-17: samba: access restriction bypass

    Date
    93
    Posted By
    The package samba before version 4.13.0-1 is vulnerable to access restriction bypass.
    Arch Linux Security Advisory ASA-202009-17
    ==========================================
    
    Severity: Medium
    Date    : 2020-09-29
    CVE-ID  : CVE-2020-1472
    Package : samba
    Type    : access restriction bypass
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1236
    
    Summary
    =======
    
    The package samba before version 4.13.0-1 is vulnerable to access
    restriction bypass.
    
    Resolution
    ==========
    
    Upgrade to 4.13.0-1.
    
    # pacman -Syu "samba>=4.13.0-1"
    
    The problem has been fixed upstream in version 4.13.0.
    
    Workaround
    ==========
    
    Ensure you do not have an schannel directive and if you do make sure
    it's either = yes or = auto.
    
    Description
    ===========
    
    A flaw was found in the Microsoft Windows Netlogon Remote Protocol (MS-
    NRPC), where it reuses a known, static, zero-value initialization
    vector (IV) in AES-CFB8 mode. This flaw allows an unauthenticated
    attacker to impersonate a domain-joined computer, including a domain
    controller, and possibly obtain domain administrator privileges. The
    highest threat from this vulnerability is to confidentiality,
    integrity, as well as system availability.
    
    Impact
    ======
    
    An unauthenticated attacker can gain administrator access through
    crafted traffic, if the samba server is configured to run with a
    vulnerable schannel directive.
    
    References
    ==========
    
    https://bugs.archlinux.org/task/67983
    https://www.samba.org/samba/security/CVE-2020-1472.html
    https://security.archlinux.org/CVE-2020-1472
    

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