Gentoo: GLSA-201408-10: Libgcrypt: Side-channel attack

    Date 29 Aug 2014
    69
    Posted By LinuxSecurity Advisories
    A vulnerability in Libgcrypt could allow a remote attacker to extract ElGamal private key information.
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    Gentoo Linux Security Advisory                           GLSA 201408-10
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                                                https://security.gentoo.org/
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     Severity: Normal
        Title: Libgcrypt: Side-channel attack
         Date: August 29, 2014
         Bugs: #519396
           ID: 201408-10
    
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    Synopsis
    ========
    
    A vulnerability in Libgcrypt could allow a remote attacker to extract
    ElGamal private key information.
    
    Background
    ==========
    
    Libgcrypt is a general purpose cryptographic library derived out of
    GnuPG.
    
    Affected packages
    =================
    
        -------------------------------------------------------------------
         Package              /     Vulnerable     /            Unaffected
        -------------------------------------------------------------------
      1  dev-libs/libgcrypt           < 1.5.4                    >= 1.5.4
    
    Description
    ===========
    
    A vulnerability in the implementation of ElGamal decryption procedures
    of Libgcrypt leaks information to various side-channels.
    
    Impact
    ======
    
    A physical side-channel attack allows a remote attacker to fully
    extract decryption keys during the decryption of a chosen ciphertext.
    
    Workaround
    ==========
    
    There is no known workaround at this time.
    
    Resolution
    ==========
    
    All Libgcrypt users should upgrade to the latest version:
    
      # emerge --sync
      # emerge --ask --oneshot --verbose ">=dev-libs/libgcrypt-1.5.4"
    
    References
    ==========
    
    [ 1 ] CVE-2014-5270
          https://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-5270
    
    Availability
    ============
    
    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:
    
     https://security.gentoo.org/glsa/glsa-201408-10.xml
    
    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 2014 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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