Gentoo: GLSA-200408-04: PuTTY: Pre-authentication arbitrary code execution

    Date05 Aug 2004
    CategoryGentoo
    40
    Posted ByLinuxSecurity Advisories
    PuTTY contains a vulnerability allowing a SSH server to execute arbitrary code on the connecting client.
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    Gentoo Linux Security Advisory                           GLSA 200408-04
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: PuTTY: Pre-authentication arbitrary code execution
          Date: August 05, 2004
          Bugs: #59383
            ID: 200408-04
    
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    Synopsis
    ========
    
    PuTTY contains a vulnerability allowing a SSH server to execute
    arbitrary code on the connecting client.
    
    Background
    ==========
    
    PuTTY is a free implementation of Telnet and SSH for Win32 and Unix
    platforms, along with an xterm terminal emulator.
    
    Affected packages
    =================
    
        -------------------------------------------------------------------
         Package         /   Vulnerable   /                     Unaffected
        -------------------------------------------------------------------
      1  net-misc/putty        <= 0.54 >= 0.55
    
    Description
    ===========
    
    PuTTY contains a vulnerability allowing a malicious server to execute
    arbitrary code on the connecting client before host key verification.
    
    Impact
    ======
    
    When connecting to a server using the SSH2 protocol an attacker is able
    to execute arbitrary code with the permissions of the user running
    PuTTY by sending specially crafted packets to the client during the
    authentication process but before host key verification.
    
    Workaround
    ==========
    
    There is no known workaround at this time. All users are encouraged to
    upgrade to the latest available version of PuTTY.
    
    Resolution
    ==========
    
    All PuTTY users should upgrade to the latest version:
    
        # emerge sync
    
        # emerge -pv ">=net-misc/putty-0.55"
        # emerge ">=net-misc/putty-0.55"
    
    References
    ==========
    
      [ 1 ] PuTTY ChangeLog
            http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
    
    Availability
    ============
    
    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:
    
        http://security.gentoo.org/glsa/glsa-200408-04.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
    http://bugs.gentoo.org.
    
    License
    =======
    
    Copyright 2004 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/1.0
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