Gentoo: GLSA-201911-01: OpenSSH: Integer overflow

    Date07 Nov 2019
    CategoryGentoo
    806
    Posted ByLinuxSecurity Advisories
    An integer overflow in OpenSSH might allow an attacker to execute arbitrary code.
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    Gentoo Linux Security Advisory                           GLSA 201911-01
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                               https://security.gentoo.org/
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    
     Severity: Normal
        Title: OpenSSH: Integer overflow
         Date: November 07, 2019
         Bugs: #697046
           ID: 201911-01
    
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    
    Synopsis
    ========
    
    An integer overflow in OpenSSH might allow an attacker to execute
    arbitrary code.
    
    Background
    ==========
    
    OpenSSH is a complete SSH protocol implementation that includes SFTP
    client and server support.
    
    Affected packages
    =================
    
        -------------------------------------------------------------------
         Package              /     Vulnerable     /            Unaffected
        -------------------------------------------------------------------
      1  net-misc/openssh           >= 8.0_p1-r2             >= 8.0_p1-r4 
    
    Description
    ===========
    
    OpenSSH, when built with "xmss" USE flag enabled, has a
    pre-authentication integer overflow if a client or server is configured
    to use a crafted XMSS key.
    
    NOTE: This USE flag is disabled by default!
    
    Impact
    ======
    
    A remote attacker could connect to a vulnerable OpenSSH server using a
    special crafted XMSS key possibly resulting in execution of arbitrary
    code with the privileges of the process or a Denial of Service
    condition.
    
    Workaround
    ==========
    
    Disable XMSS key type.
    
    Resolution
    ==========
    
    All OpenSSH users should upgrade to the latest version:
    
      # emerge --sync
      # emerge --ask --oneshot -v ">=net-misc/openssh/openssh-8.0_p1-r4"
    
    References
    ==========
    
    [ 1 ] CVE-2019-16905
          https://nvd.nist.gov/vuln/detail/CVE-2019-16905
    
    Availability
    ============
    
    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:
    
     https://security.gentoo.org/glsa/201911-01
    
    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 2019 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
    
    
    You are not authorised to post comments.

    Comments powered by CComment

    LinuxSecurity Poll

    What do you think of the articles on LinuxSecurity?

    No answer selected. Please try again.
    Please select either existing option or enter your own, however not both.
    Please select minimum 0 answer(s) and maximum 3 answer(s).
    /main-polls/24-what-do-you-think-of-the-quality-of-the-articles-on-linuxsecurity?task=poll.vote&format=json
    24
    radio
    [{"id":"87","title":"Excellent, don't change a thing!","votes":"65","type":"x","order":"1","pct":57.52,"resources":[]},{"id":"88","title":"Should be more technical","votes":"15","type":"x","order":"2","pct":13.27,"resources":[]},{"id":"89","title":"Should include more HOWTOs","votes":"33","type":"x","order":"3","pct":29.2,"resources":[]}]["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"]["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"]350
    bottom200

    We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.