Gentoo: GLSA-201408-14: stunnel: Information disclosure

    Date29 Aug 2014
    CategoryGentoo
    78
    Posted ByLinuxSecurity Advisories
    A vulnerability in stunnel might allow remote attackers to gain access to private key information.
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    Gentoo Linux Security Advisory                           GLSA 201408-14
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                                                http://security.gentoo.org/
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     Severity: Normal
        Title: stunnel: Information disclosure
         Date: August 29, 2014
         Bugs: #503506
           ID: 201408-14
    
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    Synopsis
    ========
    
    A vulnerability in stunnel might allow remote attackers to gain access
    to private key information.
    
    Background
    ==========
    
    The stunnel program is designed to work as an SSL encryption wrapper
    between a client and a local or remote server.
    
    Affected packages
    =================
    
        -------------------------------------------------------------------
         Package              /     Vulnerable     /            Unaffected
        -------------------------------------------------------------------
      1  net-misc/stunnel              < 5.02                     >= 5.02
    
    Description
    ===========
    
    stunnel does not properly update the state of the pseudo-random
    generator after fork-threading which causes subsequent children with
    the same process ID to use the same entropy pool. ECDSA and DSA keys,
    when not used in deterministic mode (RFC6979), rely on random data for
    its k parameter to not leak private key information.
    
    Impact
    ======
    
    A remote attacker may gain access to private key information from ECDSA
    or DSA keys.
    
    Workaround
    ==========
    
    There is no known workaround at this time.
    
    Resolution
    ==========
    
    All stunnel users should upgrade to the latest version:
    
      # emerge --sync
      # emerge --ask --oneshot --verbose ">=net-misc/stunnel-5.02"
    
    References
    ==========
    
    [ 1 ] CVE-2014-0016
          http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-0016
    
    Availability
    ============
    
    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:
    
     http://security.gentoo.org/glsa/glsa-201408-14.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.
    
    http://creativecommons.org/licenses/by-sa/2.5
    
    
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