Debian: DSA-2826-1: denyhosts security update

    Date22 Dec 2013
    CategoryDebian
    54
    Posted ByLinuxSecurity Advisories
    Helmut Grohne discovered that denyhosts, a tool preventing SSH brute-force attacks, could be used to perform remote denial of service against the SSH daemon. Incorrectly specified regular expressions used to detect brute force attacks in authentication logs could be exploited
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    Debian Security Advisory DSA-2826-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    http://www.debian.org/security/                         Yves-Alexis Perez
    December 22, 2013                      http://www.debian.org/security/faq
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    Package        : denyhosts
    Vulnerability  : Remote denial of ssh service
    Problem type   : remote
    Debian-specific: no
    CVE ID         : CVE-2013-6890
    
    Helmut Grohne discovered that denyhosts, a tool preventing SSH
    brute-force attacks, could be used to perform remote denial of service
    against the SSH daemon. Incorrectly specified regular expressions used
    to detect brute force attacks in authentication logs could be exploited
    by a malicious user to forge crafted login names in order to make
    denyhosts ban arbitrary IP addresses.
    
    For the oldstable distribution (squeeze), this problem has been fixed in
    version 2.6-7+deb6u2.
    
    For the stable distribution (wheezy), this problem has been fixed in
    version 2.6-10+deb7u2.
    
    For the testing distribution (jessie), this problem has been fixed in
    version 2.6-10.1.
    
    For the unstable distribution (sid), this problem has been fixed in
    version 2.6-10.1.
    
    We recommend that you upgrade your denyhosts packages.
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: http://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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