CVE-2007-4321

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    CVE-2007-4321

    Published: 14 Aug 2007Last Modified: 10 Apr 2026

    Summary:

    Details: fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string, a different vector than CVE-2006-6302.

    References: http://secunia.com/advisories/23237, http://secunia.com/advisories/28374, http://security.gentoo.org/glsa/glsa-200707-13.xml, http://www.debian.org/security/2008/dsa-1456, http://bugs.gentoo.org/show_bug.cgi?id=181214, http://osvdb.org/42484, http://www.ossec.net/en/attacking-loganalysis.html, http://www.securityfocus.com/bid/25117

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High