Gentoo: GLSA-202004-08: libssh: Denial of Service

    Date 10 Apr 2020
    358
    Posted By LinuxSecurity Advisories
    A vulnerability in libssh could allow a remote attacker to cause a Denial of Service condition.
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    Gentoo Linux Security Advisory                           GLSA 202004-08
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                                               https://security.gentoo.org/
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     Severity: Low
        Title: libssh: Denial of Service
         Date: April 10, 2020
         Bugs: #716788
           ID: 202004-08
    
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    Synopsis
    ========
    
    A vulnerability in libssh could allow a remote attacker to cause a
    Denial of Service condition.
    
    Background
    ==========
    
    libssh is a multiplatform C library implementing the SSHv2 protocol on
    client and server side.
    
    Affected packages
    =================
    
        -------------------------------------------------------------------
         Package              /     Vulnerable     /            Unaffected
        -------------------------------------------------------------------
      1  net-libs/libssh              < 0.9.4                    >= 0.9.4
    
    Description
    ===========
    
    It was discovered that libssh could crash when AES-CTR ciphers are
    used.
    
    Impact
    ======
    
    A remote attacker running a malicious client or server could possibly
    crash the counterpart implemented with libssh and cause a Denial of
    Service condition.
    
    Workaround
    ==========
    
    Disable AES-CTR ciphers. If you implement a server using libssh it is
    recommended to use a prefork model so each session runs in an own
    process.
    
    Resolution
    ==========
    
    All libssh users should upgrade to the latest version:
    
      # emerge --sync
      # emerge --ask --oneshot --verbose ">=net-libs/libssh-0.9.4"
    
    References
    ==========
    
    [ 1 ] CVE-2020-1730
          https://nvd.nist.gov/vuln/detail/CVE-2020-1730
    
    Availability
    ============
    
    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:
    
     https://security.gentoo.org/glsa/202004-08
    
    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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