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    Gentoo: GLSA-202007-21: Libreswan: Denial of service

    Date 26 Jul 2020
    136
    Posted By LinuxSecurity Advisories
    A vulnerability in Libreswan could lead to a Denial of Service condition.
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    Gentoo Linux Security Advisory                           GLSA 202007-21
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                                               https://security.gentoo.org/
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     Severity: Normal
        Title: Libreswan: Denial of service
         Date: July 27, 2020
         Bugs: #722696
           ID: 202007-21
    
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    Synopsis
    ========
    
    A vulnerability in Libreswan could lead to a Denial of Service
    condition.
    
    Background
    ==========
    
    Libreswan is a free software implementation of the most widely
    supported and standarized VPN protocol based on (“IPsec”) and the
    Internet Key Exchange (“IKE”).
    
    Affected packages
    =================
    
        -------------------------------------------------------------------
         Package              /     Vulnerable     /            Unaffected
        -------------------------------------------------------------------
      1  net-vpn/libreswan             < 3.32                     >= 3.32
    
    Description
    ===========
    
    As a result of a bug in handling certain bogus encrypted IKEv1, while
    building a log message that the packet has been dropped, a NULL pointer
    dereference causes Libreswan to crash and restart when it attempts to
    log the state name involved.
    
    Impact
    ======
    
    An attacker could cause a possible Denial of Service condition.
    
    Workaround
    ==========
    
    There is no known workaround at this time.
    
    Resolution
    ==========
    
    All Libreswan users should upgrade to the latest version:
    
      # emerge --sync
      # emerge --ask --oneshot --verbose ">=net-vpn/libreswan-3.32"
    
    References
    ==========
    
    [ 1 ] CVE-2020-1763
          https://nvd.nist.gov/vuln/detail/CVE-2020-1763
    
    Availability
    ============
    
    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:
    
     https://security.gentoo.org/glsa/202007-21
    
    Concerns?
    =========
    
    Security is a primary focus of Gentoo Linux and ensuring the
    confidentiality and security of our users' machines is of utmost
    importance to us. Any security concerns should be addressed to
    This email address is being protected from spambots. You need JavaScript enabled to view it. or alternatively, you may file a bug at
    https://bugs.gentoo.org.
    
    License
    =======
    
    Copyright 2020 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).
    
    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.
    
    https://creativecommons.org/licenses/by-sa/2.5
    
    

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