Debian: DSA-3446-1: openssh security update

    Date14 Jan 2016
    CategoryDebian
    62
    Posted ByLinuxSecurity Advisories
    The Qualys Security team discovered two vulnerabilities in the roaming code of the OpenSSH client (an implementation of the SSH protocol suite).
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    Debian Security Advisory DSA-3446-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                        Yves-Alexis Perez
    January 14, 2016                      https://www.debian.org/security/faq
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    Package        : openssh
    CVE ID         : CVE-2016-0777 CVE-2016-0778
    Debian bug     : 810984
    
    The Qualys Security team discovered two vulnerabilities in the roaming
    code of the OpenSSH client (an implementation of the SSH protocol
    suite).
    
    SSH roaming enables a client, in case an SSH connection breaks
    unexpectedly, to resume it at a later time, provided the server also
    supports it.
    
    The OpenSSH server doesn't support roaming, but the OpenSSH client
    supports it (even though it's not documented) and it's enabled by
    default.
    
    CVE-2016-0777
    
        An information leak (memory disclosure) can be exploited by a rogue
        SSH server to trick a client into leaking sensitive data from the
        client memory, including for example private keys.
    
    CVE-2016-0778
    
        A buffer overflow (leading to file descriptor leak), can also be
        exploited by a rogue SSH server, but due to another bug in the code
        is possibly not exploitable, and only under certain conditions (not
        the default configuration), when using ProxyCommand, ForwardAgent or
        ForwardX11.
    
    This security update completely disables the roaming code in the OpenSSH
    client.
    
    It is also possible to disable roaming by adding the (undocumented)
    option 'UseRoaming no' to the global /etc/ssh/ssh_config file, or to the
    user configuration in ~/.ssh/config, or by passing -oUseRoaming=no on
    the command line.
    
    Users with passphrase-less privates keys, especially in non interactive
    setups (automated jobs using ssh, scp, rsync+ssh etc.) are advised to
    update their keys if they have connected to an SSH server they don't
    trust.
    
    More details about identifying an attack and mitigations will be
    available in the Qualys Security Advisory.
    
    For the oldstable distribution (wheezy), these problems have been fixed
    in version 1:6.0p1-4+deb7u3.
    
    For the stable distribution (jessie), these problems have been fixed in
    version 1:6.7p1-5+deb8u1.
    
    For the testing distribution (stretch) and unstable distribution (sid), these
    problems will be fixed in a later version.
    
    We recommend that you upgrade your openssh packages.
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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