Debian: DSA-3626-1: openssh security update

    Date24 Jul 2016
    CategoryDebian
    64
    Posted ByLinuxSecurity Advisories
    Eddie Harari reported that the OpenSSH SSH daemon allows user enumeration through timing differences when trying to authenticate users. When sshd tries to authenticate a non-existing user, it will pick up a fixed fake password structure with a hash based on the Blowfish
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3626-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    July 24, 2016                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : openssh
    CVE ID         : CVE-2016-6210
    Debian Bug     : 831902
    
    Eddie Harari reported that the OpenSSH SSH daemon allows user
    enumeration through timing differences when trying to authenticate
    users. When sshd tries to authenticate a non-existing user, it will pick
    up a fixed fake password structure with a hash based on the Blowfish
    algorithm. If real users passwords are hashed using SHA256/SHA512, then
    a remote attacker can take advantage of this flaw by sending large
    passwords, receiving shorter response times from the server for
    non-existing users.
    
    For the stable distribution (jessie), this problem has been fixed in
    version 1:6.7p1-5+deb8u3.
    
    For the unstable distribution (sid), this problem has been fixed in
    version 1:7.2p2-6.
    
    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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